ascat-b l1 calibration and validation report - eumetsat
TRANSCRIPT
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCAT-B Level 1 Calibration and Validation Report
EUMETSAT DocNo EUMOPSDOC123436 EUMETSAT Allee 1 D-64295 Darmstadt Germany Issue v2 Tel +49 6151 807-7
Fax +49 6151 807 555 Date 20 December 2012 httpwwweumetsatint
Page 1 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This page intentionally left blank
Page 2 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Document Change Record
Issue Revision
Date DCN No Changed Pages Paragraphs
V1A 31 October 2012 First issue for trial dissemination
V2 20 December 2012 Issue for pre-operational dissemination ndash calval partners feedbacj added
Page 3 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Table of Contents
1 Introduction 5 11 Purpose and Scope 5 12 Description of Validation Environment 5 13 Applicable and Reference Documents 6
131 Applicable Documents 6 132 Reference Documents 6
14 List of acronyms and abbreviations 6 2 Prototype Results 7 3 Internal EUMETSAT Validation 7
31 Internal calibration ndash locking of calibration constants 7 32 Monitoring of instrument telemetry 9 33 Monitoring of reference functions 9
331 Power Gain Product (PGP) 9 332 Noise power (NP) 12 333 Receive filter shape (hrx) 14
34 Gain compression monitoring 18 35 Monitoring of transponder calibration (CAL) passes and geolocation18 36 Initial calibration ndash verification and refinement 22 37 Level 1b product first look at Kp 31 38 Flag validation 34
4 External Partner Validation 35 41 OSI-SAF (KNMI) 35 42 ECMWF 40 43 H-SAF (TU-Wien) 40
5 Conclusions 41 51 Product Validation Summary 41 52 Product Validation Issues 41 53 Actions for Product Rollout 42
531 Time Schedule 42 532 User Notification 42 533 Verification 42 534 Document Update 42 535 Web Update 42
6 Recommendation 42 Appendix A Summary of analysis of first 5 minutes of data on 2309 43 Appendix B Summary of analysis of first 100 minutes of data on 2509 47 Appendix C Monitoring of instrument telemetry 52 Appendix D Examples of PGP excursions in detail 57 Appendix E Analysis of PGP vs raw echo variations 58 Appendix F Input ISP values to the PGP calculation 60 Appendix G Preliminary cross-calibration input L0 data and PPF configuration 63 Appendix H Gound Segment Configuration Changes 66 Appendix I ASCAT Transponder poInt target radar backscattering cross-sections 67 Appendix J Sanity check on the calibration tuning on 1810 69
Page 4 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
1 INTRODUCTION
11 Purpose and Scope
This Product Validation Report provides the results of the calibration and validation testing of the following Advanced SCATterometer (ASCAT) products in the context of the EUMETSAT Polar System (EPS) Metop-B satellite commissioning
ASCA_xxx_1A ASCA_SZO_1B ASCA_SZR_1B ASCA_SZF_1B
The Metop-B satellite has been launched from Baikonur on September 17th 2012 The satellite commissioning including CalVal testing aims at verifying the capability of the satellite and ground segment to provide operational services with the required levels of availability timeliness and quality In particular the main objective of CalVal is to ensure that the quality of the products satisfies the operational requirements
This report is submitted to the Product Validation Review Board in order to decide on the validation status of the products It is intended for the members of the Science and Products Validation Team (SPVT) as well as to the Metop-B commissioning management
This issue is intended to assess the readiness to start the pre-operational dissemination after a trial dissemination phase to CalVal partners has been completed These are in particular
Ocean and Sea ice Satellite Applications Facility (OSIndashSAF) Satellite Applications Facility on support to Operational Hydrology and Water
Management (H-SAF) European Centre for Medium Range Weather Forecasting (ECMWF) National Oceanic and Atmospheric Administration (NOAA) The ASCAT Science Advisory Group (SAG)
Special thanks to Colin Duff and Helmut Bauch for their support in the off-line product processing and generation of plots as well as well as to the operational software maintenance team for their support with the necessary ground segment processor configuration updates
12 Description of Validation Environment
The product validation has been performed with the following elements
- EPS validation ground segment (GS2) running ASCAT Product Processing Facility (PPF) 81
- Technical Computing Environment (TCE) off-line ASCAT PPF v81 - TCE ASCAT Monitoring Data Processing System (DPS) daily reports and off-line
validation tools - httptcwebeumetsatint~andersondpsdbmonhtm
Page 5 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- EPS Product Quality Monitoring validation environment (EPQM VAL) and daily reports - httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring
13 Applicable and Reference Documents
131 Applicable Documents
AD1 ASCAT Verification Calibration and Validation Plan EUMMETTEN110187 AD2 EPS Programme Calibration and Validation Overall Plan
EUMEPSSYSPLN02004
132 Reference Documents
RD1 ACAT CalVal schedule - DOCSLIB220251 RD2 ASCAT Instrument Operations Manual (IOM) ref MO-MA-DOR-SC-0008
14 List of acronyms and abbreviations
ASCAT-A Advanced SCATterometer on METOP-A (Flight Model 2) ASCAT-B Advanced SCATterometer on METOP-A (Flight Model 1) ASCAT SAG ASCAT Science Advisory Group CAL Calibration CalVal Calibration and Validation CSIC Consejo Superior de Investigaciones Cientiacuteficas DPS Data Processing System (for product quality monitoring) ECMWF European Centre for Medium Range Weather Forecasting EPQM OPEVAL EPS Product Quality Monitoring OPErational and VALidation environments EPS European Polar System EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GCM Gain Compression Monitoring GS1 Operational Ground Segment GS2 Validation Ground Segment GS3 Integration Ground Segment HKTM House Keeping TeleMetry Hrx Receive Filter Shape H-SAF Satellite Applications Facility on support to Hydrology and Water Management ISP Instrument Source Packet METOP METeorological Operational Platform NOAA National Atmospheric and Oceanic Administration NOC NWP Ocean Calibration NWP Numerical Weather Prediction NP Noise Power NTG Normalisation Table Generation OSI-SAF Ocean and Sea Ice Satellite Applications Facility PDU Processing Data Unit PGP Power Gain Product PPF Product Processing Facility SIOV System In Orbit Verification SPVT Science and Products Validation Team SWET Software Engineering Task TCE Technical Computing Environment WVC Wind Vector Cell
Page 6 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
2 PROTOTYPE RESULTS
As a sanity check some basic parameters from the products have been generated with an offshyline standalone prototype and compared against the product contents This tool is however a flexible and highly configurable implementation of the processing algorithms and as such not under strict configuration control The validation results below are exclusively based on the contents and quality checks on the products generated in GS2 or of those generated off-line in the TCE with the ASCAT PPF
3 INTERNAL EUMETSAT VALIDATION
Following AD1 below are the tasks to perform for ASCAT-B product commissioning highlighting those addressed (green) or partially addressed (orange) for the purpose of assessing the readiness of the products to be open to pre-operational dissemination
1 Internal calibration ndash locking of calibration constants 2Level 1a product ndash monitoring of instrument telemetry 3Level 1a product ndash reference function monitoring 4 Initial calibration ndash verification and refinement 5Gain compression monitoring 6External calibration ndash generation of normalisation tables 7External calibration ndash geolocation accuracy assessment 8External calibration ndash monitor ASCAT pulse shape 9Level 1b product ndash monitoring of swath geometry 10 Level 1b product ndash validation using rainforests 11 Level 1b product ndash validation using ocean 12 Level 1b product ndash validation using sea ice 13 Level 1b product ndash quality flags assessment 14 Tuning and modification of product generation 15 Overall assessment and reporting
In the following sections we will report on the activities and results associated to each task
31 Internal calibration ndash locking of calibration constants
The initial setting at launch was all six cCal parameters set to a value of 1 (ASCA_PRC_v10) This resulted in a Power Gain Product (PGP) values of the order of 108
(rather than the expected value of 1) and backscatter values of around 40 dB lower than expected
A new auxiliary file (ASCA_PRC_xx_M01 v11) with the cCal values taken from ASCAT-A was used to re-generate the data off-line
95297160e-09 96879270e-09 96960770e-09 95415500e-09 97042420e-09 95061350e-09
This produced both PGP and sigma0s in the expected range (see Appendix A)
Page 7 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This page intentionally left blank
Page 2 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Document Change Record
Issue Revision
Date DCN No Changed Pages Paragraphs
V1A 31 October 2012 First issue for trial dissemination
V2 20 December 2012 Issue for pre-operational dissemination ndash calval partners feedbacj added
Page 3 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Table of Contents
1 Introduction 5 11 Purpose and Scope 5 12 Description of Validation Environment 5 13 Applicable and Reference Documents 6
131 Applicable Documents 6 132 Reference Documents 6
14 List of acronyms and abbreviations 6 2 Prototype Results 7 3 Internal EUMETSAT Validation 7
31 Internal calibration ndash locking of calibration constants 7 32 Monitoring of instrument telemetry 9 33 Monitoring of reference functions 9
331 Power Gain Product (PGP) 9 332 Noise power (NP) 12 333 Receive filter shape (hrx) 14
34 Gain compression monitoring 18 35 Monitoring of transponder calibration (CAL) passes and geolocation18 36 Initial calibration ndash verification and refinement 22 37 Level 1b product first look at Kp 31 38 Flag validation 34
4 External Partner Validation 35 41 OSI-SAF (KNMI) 35 42 ECMWF 40 43 H-SAF (TU-Wien) 40
5 Conclusions 41 51 Product Validation Summary 41 52 Product Validation Issues 41 53 Actions for Product Rollout 42
531 Time Schedule 42 532 User Notification 42 533 Verification 42 534 Document Update 42 535 Web Update 42
6 Recommendation 42 Appendix A Summary of analysis of first 5 minutes of data on 2309 43 Appendix B Summary of analysis of first 100 minutes of data on 2509 47 Appendix C Monitoring of instrument telemetry 52 Appendix D Examples of PGP excursions in detail 57 Appendix E Analysis of PGP vs raw echo variations 58 Appendix F Input ISP values to the PGP calculation 60 Appendix G Preliminary cross-calibration input L0 data and PPF configuration 63 Appendix H Gound Segment Configuration Changes 66 Appendix I ASCAT Transponder poInt target radar backscattering cross-sections 67 Appendix J Sanity check on the calibration tuning on 1810 69
Page 4 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
1 INTRODUCTION
11 Purpose and Scope
This Product Validation Report provides the results of the calibration and validation testing of the following Advanced SCATterometer (ASCAT) products in the context of the EUMETSAT Polar System (EPS) Metop-B satellite commissioning
ASCA_xxx_1A ASCA_SZO_1B ASCA_SZR_1B ASCA_SZF_1B
The Metop-B satellite has been launched from Baikonur on September 17th 2012 The satellite commissioning including CalVal testing aims at verifying the capability of the satellite and ground segment to provide operational services with the required levels of availability timeliness and quality In particular the main objective of CalVal is to ensure that the quality of the products satisfies the operational requirements
This report is submitted to the Product Validation Review Board in order to decide on the validation status of the products It is intended for the members of the Science and Products Validation Team (SPVT) as well as to the Metop-B commissioning management
This issue is intended to assess the readiness to start the pre-operational dissemination after a trial dissemination phase to CalVal partners has been completed These are in particular
Ocean and Sea ice Satellite Applications Facility (OSIndashSAF) Satellite Applications Facility on support to Operational Hydrology and Water
Management (H-SAF) European Centre for Medium Range Weather Forecasting (ECMWF) National Oceanic and Atmospheric Administration (NOAA) The ASCAT Science Advisory Group (SAG)
Special thanks to Colin Duff and Helmut Bauch for their support in the off-line product processing and generation of plots as well as well as to the operational software maintenance team for their support with the necessary ground segment processor configuration updates
12 Description of Validation Environment
The product validation has been performed with the following elements
- EPS validation ground segment (GS2) running ASCAT Product Processing Facility (PPF) 81
- Technical Computing Environment (TCE) off-line ASCAT PPF v81 - TCE ASCAT Monitoring Data Processing System (DPS) daily reports and off-line
validation tools - httptcwebeumetsatint~andersondpsdbmonhtm
Page 5 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- EPS Product Quality Monitoring validation environment (EPQM VAL) and daily reports - httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring
13 Applicable and Reference Documents
131 Applicable Documents
AD1 ASCAT Verification Calibration and Validation Plan EUMMETTEN110187 AD2 EPS Programme Calibration and Validation Overall Plan
EUMEPSSYSPLN02004
132 Reference Documents
RD1 ACAT CalVal schedule - DOCSLIB220251 RD2 ASCAT Instrument Operations Manual (IOM) ref MO-MA-DOR-SC-0008
14 List of acronyms and abbreviations
ASCAT-A Advanced SCATterometer on METOP-A (Flight Model 2) ASCAT-B Advanced SCATterometer on METOP-A (Flight Model 1) ASCAT SAG ASCAT Science Advisory Group CAL Calibration CalVal Calibration and Validation CSIC Consejo Superior de Investigaciones Cientiacuteficas DPS Data Processing System (for product quality monitoring) ECMWF European Centre for Medium Range Weather Forecasting EPQM OPEVAL EPS Product Quality Monitoring OPErational and VALidation environments EPS European Polar System EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GCM Gain Compression Monitoring GS1 Operational Ground Segment GS2 Validation Ground Segment GS3 Integration Ground Segment HKTM House Keeping TeleMetry Hrx Receive Filter Shape H-SAF Satellite Applications Facility on support to Hydrology and Water Management ISP Instrument Source Packet METOP METeorological Operational Platform NOAA National Atmospheric and Oceanic Administration NOC NWP Ocean Calibration NWP Numerical Weather Prediction NP Noise Power NTG Normalisation Table Generation OSI-SAF Ocean and Sea Ice Satellite Applications Facility PDU Processing Data Unit PGP Power Gain Product PPF Product Processing Facility SIOV System In Orbit Verification SPVT Science and Products Validation Team SWET Software Engineering Task TCE Technical Computing Environment WVC Wind Vector Cell
Page 6 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
2 PROTOTYPE RESULTS
As a sanity check some basic parameters from the products have been generated with an offshyline standalone prototype and compared against the product contents This tool is however a flexible and highly configurable implementation of the processing algorithms and as such not under strict configuration control The validation results below are exclusively based on the contents and quality checks on the products generated in GS2 or of those generated off-line in the TCE with the ASCAT PPF
3 INTERNAL EUMETSAT VALIDATION
Following AD1 below are the tasks to perform for ASCAT-B product commissioning highlighting those addressed (green) or partially addressed (orange) for the purpose of assessing the readiness of the products to be open to pre-operational dissemination
1 Internal calibration ndash locking of calibration constants 2Level 1a product ndash monitoring of instrument telemetry 3Level 1a product ndash reference function monitoring 4 Initial calibration ndash verification and refinement 5Gain compression monitoring 6External calibration ndash generation of normalisation tables 7External calibration ndash geolocation accuracy assessment 8External calibration ndash monitor ASCAT pulse shape 9Level 1b product ndash monitoring of swath geometry 10 Level 1b product ndash validation using rainforests 11 Level 1b product ndash validation using ocean 12 Level 1b product ndash validation using sea ice 13 Level 1b product ndash quality flags assessment 14 Tuning and modification of product generation 15 Overall assessment and reporting
In the following sections we will report on the activities and results associated to each task
31 Internal calibration ndash locking of calibration constants
The initial setting at launch was all six cCal parameters set to a value of 1 (ASCA_PRC_v10) This resulted in a Power Gain Product (PGP) values of the order of 108
(rather than the expected value of 1) and backscatter values of around 40 dB lower than expected
A new auxiliary file (ASCA_PRC_xx_M01 v11) with the cCal values taken from ASCAT-A was used to re-generate the data off-line
95297160e-09 96879270e-09 96960770e-09 95415500e-09 97042420e-09 95061350e-09
This produced both PGP and sigma0s in the expected range (see Appendix A)
Page 7 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Document Change Record
Issue Revision
Date DCN No Changed Pages Paragraphs
V1A 31 October 2012 First issue for trial dissemination
V2 20 December 2012 Issue for pre-operational dissemination ndash calval partners feedbacj added
Page 3 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Table of Contents
1 Introduction 5 11 Purpose and Scope 5 12 Description of Validation Environment 5 13 Applicable and Reference Documents 6
131 Applicable Documents 6 132 Reference Documents 6
14 List of acronyms and abbreviations 6 2 Prototype Results 7 3 Internal EUMETSAT Validation 7
31 Internal calibration ndash locking of calibration constants 7 32 Monitoring of instrument telemetry 9 33 Monitoring of reference functions 9
331 Power Gain Product (PGP) 9 332 Noise power (NP) 12 333 Receive filter shape (hrx) 14
34 Gain compression monitoring 18 35 Monitoring of transponder calibration (CAL) passes and geolocation18 36 Initial calibration ndash verification and refinement 22 37 Level 1b product first look at Kp 31 38 Flag validation 34
4 External Partner Validation 35 41 OSI-SAF (KNMI) 35 42 ECMWF 40 43 H-SAF (TU-Wien) 40
5 Conclusions 41 51 Product Validation Summary 41 52 Product Validation Issues 41 53 Actions for Product Rollout 42
531 Time Schedule 42 532 User Notification 42 533 Verification 42 534 Document Update 42 535 Web Update 42
6 Recommendation 42 Appendix A Summary of analysis of first 5 minutes of data on 2309 43 Appendix B Summary of analysis of first 100 minutes of data on 2509 47 Appendix C Monitoring of instrument telemetry 52 Appendix D Examples of PGP excursions in detail 57 Appendix E Analysis of PGP vs raw echo variations 58 Appendix F Input ISP values to the PGP calculation 60 Appendix G Preliminary cross-calibration input L0 data and PPF configuration 63 Appendix H Gound Segment Configuration Changes 66 Appendix I ASCAT Transponder poInt target radar backscattering cross-sections 67 Appendix J Sanity check on the calibration tuning on 1810 69
Page 4 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
1 INTRODUCTION
11 Purpose and Scope
This Product Validation Report provides the results of the calibration and validation testing of the following Advanced SCATterometer (ASCAT) products in the context of the EUMETSAT Polar System (EPS) Metop-B satellite commissioning
ASCA_xxx_1A ASCA_SZO_1B ASCA_SZR_1B ASCA_SZF_1B
The Metop-B satellite has been launched from Baikonur on September 17th 2012 The satellite commissioning including CalVal testing aims at verifying the capability of the satellite and ground segment to provide operational services with the required levels of availability timeliness and quality In particular the main objective of CalVal is to ensure that the quality of the products satisfies the operational requirements
This report is submitted to the Product Validation Review Board in order to decide on the validation status of the products It is intended for the members of the Science and Products Validation Team (SPVT) as well as to the Metop-B commissioning management
This issue is intended to assess the readiness to start the pre-operational dissemination after a trial dissemination phase to CalVal partners has been completed These are in particular
Ocean and Sea ice Satellite Applications Facility (OSIndashSAF) Satellite Applications Facility on support to Operational Hydrology and Water
Management (H-SAF) European Centre for Medium Range Weather Forecasting (ECMWF) National Oceanic and Atmospheric Administration (NOAA) The ASCAT Science Advisory Group (SAG)
Special thanks to Colin Duff and Helmut Bauch for their support in the off-line product processing and generation of plots as well as well as to the operational software maintenance team for their support with the necessary ground segment processor configuration updates
12 Description of Validation Environment
The product validation has been performed with the following elements
- EPS validation ground segment (GS2) running ASCAT Product Processing Facility (PPF) 81
- Technical Computing Environment (TCE) off-line ASCAT PPF v81 - TCE ASCAT Monitoring Data Processing System (DPS) daily reports and off-line
validation tools - httptcwebeumetsatint~andersondpsdbmonhtm
Page 5 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- EPS Product Quality Monitoring validation environment (EPQM VAL) and daily reports - httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring
13 Applicable and Reference Documents
131 Applicable Documents
AD1 ASCAT Verification Calibration and Validation Plan EUMMETTEN110187 AD2 EPS Programme Calibration and Validation Overall Plan
EUMEPSSYSPLN02004
132 Reference Documents
RD1 ACAT CalVal schedule - DOCSLIB220251 RD2 ASCAT Instrument Operations Manual (IOM) ref MO-MA-DOR-SC-0008
14 List of acronyms and abbreviations
ASCAT-A Advanced SCATterometer on METOP-A (Flight Model 2) ASCAT-B Advanced SCATterometer on METOP-A (Flight Model 1) ASCAT SAG ASCAT Science Advisory Group CAL Calibration CalVal Calibration and Validation CSIC Consejo Superior de Investigaciones Cientiacuteficas DPS Data Processing System (for product quality monitoring) ECMWF European Centre for Medium Range Weather Forecasting EPQM OPEVAL EPS Product Quality Monitoring OPErational and VALidation environments EPS European Polar System EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GCM Gain Compression Monitoring GS1 Operational Ground Segment GS2 Validation Ground Segment GS3 Integration Ground Segment HKTM House Keeping TeleMetry Hrx Receive Filter Shape H-SAF Satellite Applications Facility on support to Hydrology and Water Management ISP Instrument Source Packet METOP METeorological Operational Platform NOAA National Atmospheric and Oceanic Administration NOC NWP Ocean Calibration NWP Numerical Weather Prediction NP Noise Power NTG Normalisation Table Generation OSI-SAF Ocean and Sea Ice Satellite Applications Facility PDU Processing Data Unit PGP Power Gain Product PPF Product Processing Facility SIOV System In Orbit Verification SPVT Science and Products Validation Team SWET Software Engineering Task TCE Technical Computing Environment WVC Wind Vector Cell
Page 6 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
2 PROTOTYPE RESULTS
As a sanity check some basic parameters from the products have been generated with an offshyline standalone prototype and compared against the product contents This tool is however a flexible and highly configurable implementation of the processing algorithms and as such not under strict configuration control The validation results below are exclusively based on the contents and quality checks on the products generated in GS2 or of those generated off-line in the TCE with the ASCAT PPF
3 INTERNAL EUMETSAT VALIDATION
Following AD1 below are the tasks to perform for ASCAT-B product commissioning highlighting those addressed (green) or partially addressed (orange) for the purpose of assessing the readiness of the products to be open to pre-operational dissemination
1 Internal calibration ndash locking of calibration constants 2Level 1a product ndash monitoring of instrument telemetry 3Level 1a product ndash reference function monitoring 4 Initial calibration ndash verification and refinement 5Gain compression monitoring 6External calibration ndash generation of normalisation tables 7External calibration ndash geolocation accuracy assessment 8External calibration ndash monitor ASCAT pulse shape 9Level 1b product ndash monitoring of swath geometry 10 Level 1b product ndash validation using rainforests 11 Level 1b product ndash validation using ocean 12 Level 1b product ndash validation using sea ice 13 Level 1b product ndash quality flags assessment 14 Tuning and modification of product generation 15 Overall assessment and reporting
In the following sections we will report on the activities and results associated to each task
31 Internal calibration ndash locking of calibration constants
The initial setting at launch was all six cCal parameters set to a value of 1 (ASCA_PRC_v10) This resulted in a Power Gain Product (PGP) values of the order of 108
(rather than the expected value of 1) and backscatter values of around 40 dB lower than expected
A new auxiliary file (ASCA_PRC_xx_M01 v11) with the cCal values taken from ASCAT-A was used to re-generate the data off-line
95297160e-09 96879270e-09 96960770e-09 95415500e-09 97042420e-09 95061350e-09
This produced both PGP and sigma0s in the expected range (see Appendix A)
Page 7 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Table of Contents
1 Introduction 5 11 Purpose and Scope 5 12 Description of Validation Environment 5 13 Applicable and Reference Documents 6
131 Applicable Documents 6 132 Reference Documents 6
14 List of acronyms and abbreviations 6 2 Prototype Results 7 3 Internal EUMETSAT Validation 7
31 Internal calibration ndash locking of calibration constants 7 32 Monitoring of instrument telemetry 9 33 Monitoring of reference functions 9
331 Power Gain Product (PGP) 9 332 Noise power (NP) 12 333 Receive filter shape (hrx) 14
34 Gain compression monitoring 18 35 Monitoring of transponder calibration (CAL) passes and geolocation18 36 Initial calibration ndash verification and refinement 22 37 Level 1b product first look at Kp 31 38 Flag validation 34
4 External Partner Validation 35 41 OSI-SAF (KNMI) 35 42 ECMWF 40 43 H-SAF (TU-Wien) 40
5 Conclusions 41 51 Product Validation Summary 41 52 Product Validation Issues 41 53 Actions for Product Rollout 42
531 Time Schedule 42 532 User Notification 42 533 Verification 42 534 Document Update 42 535 Web Update 42
6 Recommendation 42 Appendix A Summary of analysis of first 5 minutes of data on 2309 43 Appendix B Summary of analysis of first 100 minutes of data on 2509 47 Appendix C Monitoring of instrument telemetry 52 Appendix D Examples of PGP excursions in detail 57 Appendix E Analysis of PGP vs raw echo variations 58 Appendix F Input ISP values to the PGP calculation 60 Appendix G Preliminary cross-calibration input L0 data and PPF configuration 63 Appendix H Gound Segment Configuration Changes 66 Appendix I ASCAT Transponder poInt target radar backscattering cross-sections 67 Appendix J Sanity check on the calibration tuning on 1810 69
Page 4 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
1 INTRODUCTION
11 Purpose and Scope
This Product Validation Report provides the results of the calibration and validation testing of the following Advanced SCATterometer (ASCAT) products in the context of the EUMETSAT Polar System (EPS) Metop-B satellite commissioning
ASCA_xxx_1A ASCA_SZO_1B ASCA_SZR_1B ASCA_SZF_1B
The Metop-B satellite has been launched from Baikonur on September 17th 2012 The satellite commissioning including CalVal testing aims at verifying the capability of the satellite and ground segment to provide operational services with the required levels of availability timeliness and quality In particular the main objective of CalVal is to ensure that the quality of the products satisfies the operational requirements
This report is submitted to the Product Validation Review Board in order to decide on the validation status of the products It is intended for the members of the Science and Products Validation Team (SPVT) as well as to the Metop-B commissioning management
This issue is intended to assess the readiness to start the pre-operational dissemination after a trial dissemination phase to CalVal partners has been completed These are in particular
Ocean and Sea ice Satellite Applications Facility (OSIndashSAF) Satellite Applications Facility on support to Operational Hydrology and Water
Management (H-SAF) European Centre for Medium Range Weather Forecasting (ECMWF) National Oceanic and Atmospheric Administration (NOAA) The ASCAT Science Advisory Group (SAG)
Special thanks to Colin Duff and Helmut Bauch for their support in the off-line product processing and generation of plots as well as well as to the operational software maintenance team for their support with the necessary ground segment processor configuration updates
12 Description of Validation Environment
The product validation has been performed with the following elements
- EPS validation ground segment (GS2) running ASCAT Product Processing Facility (PPF) 81
- Technical Computing Environment (TCE) off-line ASCAT PPF v81 - TCE ASCAT Monitoring Data Processing System (DPS) daily reports and off-line
validation tools - httptcwebeumetsatint~andersondpsdbmonhtm
Page 5 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- EPS Product Quality Monitoring validation environment (EPQM VAL) and daily reports - httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring
13 Applicable and Reference Documents
131 Applicable Documents
AD1 ASCAT Verification Calibration and Validation Plan EUMMETTEN110187 AD2 EPS Programme Calibration and Validation Overall Plan
EUMEPSSYSPLN02004
132 Reference Documents
RD1 ACAT CalVal schedule - DOCSLIB220251 RD2 ASCAT Instrument Operations Manual (IOM) ref MO-MA-DOR-SC-0008
14 List of acronyms and abbreviations
ASCAT-A Advanced SCATterometer on METOP-A (Flight Model 2) ASCAT-B Advanced SCATterometer on METOP-A (Flight Model 1) ASCAT SAG ASCAT Science Advisory Group CAL Calibration CalVal Calibration and Validation CSIC Consejo Superior de Investigaciones Cientiacuteficas DPS Data Processing System (for product quality monitoring) ECMWF European Centre for Medium Range Weather Forecasting EPQM OPEVAL EPS Product Quality Monitoring OPErational and VALidation environments EPS European Polar System EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GCM Gain Compression Monitoring GS1 Operational Ground Segment GS2 Validation Ground Segment GS3 Integration Ground Segment HKTM House Keeping TeleMetry Hrx Receive Filter Shape H-SAF Satellite Applications Facility on support to Hydrology and Water Management ISP Instrument Source Packet METOP METeorological Operational Platform NOAA National Atmospheric and Oceanic Administration NOC NWP Ocean Calibration NWP Numerical Weather Prediction NP Noise Power NTG Normalisation Table Generation OSI-SAF Ocean and Sea Ice Satellite Applications Facility PDU Processing Data Unit PGP Power Gain Product PPF Product Processing Facility SIOV System In Orbit Verification SPVT Science and Products Validation Team SWET Software Engineering Task TCE Technical Computing Environment WVC Wind Vector Cell
Page 6 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
2 PROTOTYPE RESULTS
As a sanity check some basic parameters from the products have been generated with an offshyline standalone prototype and compared against the product contents This tool is however a flexible and highly configurable implementation of the processing algorithms and as such not under strict configuration control The validation results below are exclusively based on the contents and quality checks on the products generated in GS2 or of those generated off-line in the TCE with the ASCAT PPF
3 INTERNAL EUMETSAT VALIDATION
Following AD1 below are the tasks to perform for ASCAT-B product commissioning highlighting those addressed (green) or partially addressed (orange) for the purpose of assessing the readiness of the products to be open to pre-operational dissemination
1 Internal calibration ndash locking of calibration constants 2Level 1a product ndash monitoring of instrument telemetry 3Level 1a product ndash reference function monitoring 4 Initial calibration ndash verification and refinement 5Gain compression monitoring 6External calibration ndash generation of normalisation tables 7External calibration ndash geolocation accuracy assessment 8External calibration ndash monitor ASCAT pulse shape 9Level 1b product ndash monitoring of swath geometry 10 Level 1b product ndash validation using rainforests 11 Level 1b product ndash validation using ocean 12 Level 1b product ndash validation using sea ice 13 Level 1b product ndash quality flags assessment 14 Tuning and modification of product generation 15 Overall assessment and reporting
In the following sections we will report on the activities and results associated to each task
31 Internal calibration ndash locking of calibration constants
The initial setting at launch was all six cCal parameters set to a value of 1 (ASCA_PRC_v10) This resulted in a Power Gain Product (PGP) values of the order of 108
(rather than the expected value of 1) and backscatter values of around 40 dB lower than expected
A new auxiliary file (ASCA_PRC_xx_M01 v11) with the cCal values taken from ASCAT-A was used to re-generate the data off-line
95297160e-09 96879270e-09 96960770e-09 95415500e-09 97042420e-09 95061350e-09
This produced both PGP and sigma0s in the expected range (see Appendix A)
Page 7 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
1 INTRODUCTION
11 Purpose and Scope
This Product Validation Report provides the results of the calibration and validation testing of the following Advanced SCATterometer (ASCAT) products in the context of the EUMETSAT Polar System (EPS) Metop-B satellite commissioning
ASCA_xxx_1A ASCA_SZO_1B ASCA_SZR_1B ASCA_SZF_1B
The Metop-B satellite has been launched from Baikonur on September 17th 2012 The satellite commissioning including CalVal testing aims at verifying the capability of the satellite and ground segment to provide operational services with the required levels of availability timeliness and quality In particular the main objective of CalVal is to ensure that the quality of the products satisfies the operational requirements
This report is submitted to the Product Validation Review Board in order to decide on the validation status of the products It is intended for the members of the Science and Products Validation Team (SPVT) as well as to the Metop-B commissioning management
This issue is intended to assess the readiness to start the pre-operational dissemination after a trial dissemination phase to CalVal partners has been completed These are in particular
Ocean and Sea ice Satellite Applications Facility (OSIndashSAF) Satellite Applications Facility on support to Operational Hydrology and Water
Management (H-SAF) European Centre for Medium Range Weather Forecasting (ECMWF) National Oceanic and Atmospheric Administration (NOAA) The ASCAT Science Advisory Group (SAG)
Special thanks to Colin Duff and Helmut Bauch for their support in the off-line product processing and generation of plots as well as well as to the operational software maintenance team for their support with the necessary ground segment processor configuration updates
12 Description of Validation Environment
The product validation has been performed with the following elements
- EPS validation ground segment (GS2) running ASCAT Product Processing Facility (PPF) 81
- Technical Computing Environment (TCE) off-line ASCAT PPF v81 - TCE ASCAT Monitoring Data Processing System (DPS) daily reports and off-line
validation tools - httptcwebeumetsatint~andersondpsdbmonhtm
Page 5 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- EPS Product Quality Monitoring validation environment (EPQM VAL) and daily reports - httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring
13 Applicable and Reference Documents
131 Applicable Documents
AD1 ASCAT Verification Calibration and Validation Plan EUMMETTEN110187 AD2 EPS Programme Calibration and Validation Overall Plan
EUMEPSSYSPLN02004
132 Reference Documents
RD1 ACAT CalVal schedule - DOCSLIB220251 RD2 ASCAT Instrument Operations Manual (IOM) ref MO-MA-DOR-SC-0008
14 List of acronyms and abbreviations
ASCAT-A Advanced SCATterometer on METOP-A (Flight Model 2) ASCAT-B Advanced SCATterometer on METOP-A (Flight Model 1) ASCAT SAG ASCAT Science Advisory Group CAL Calibration CalVal Calibration and Validation CSIC Consejo Superior de Investigaciones Cientiacuteficas DPS Data Processing System (for product quality monitoring) ECMWF European Centre for Medium Range Weather Forecasting EPQM OPEVAL EPS Product Quality Monitoring OPErational and VALidation environments EPS European Polar System EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GCM Gain Compression Monitoring GS1 Operational Ground Segment GS2 Validation Ground Segment GS3 Integration Ground Segment HKTM House Keeping TeleMetry Hrx Receive Filter Shape H-SAF Satellite Applications Facility on support to Hydrology and Water Management ISP Instrument Source Packet METOP METeorological Operational Platform NOAA National Atmospheric and Oceanic Administration NOC NWP Ocean Calibration NWP Numerical Weather Prediction NP Noise Power NTG Normalisation Table Generation OSI-SAF Ocean and Sea Ice Satellite Applications Facility PDU Processing Data Unit PGP Power Gain Product PPF Product Processing Facility SIOV System In Orbit Verification SPVT Science and Products Validation Team SWET Software Engineering Task TCE Technical Computing Environment WVC Wind Vector Cell
Page 6 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
2 PROTOTYPE RESULTS
As a sanity check some basic parameters from the products have been generated with an offshyline standalone prototype and compared against the product contents This tool is however a flexible and highly configurable implementation of the processing algorithms and as such not under strict configuration control The validation results below are exclusively based on the contents and quality checks on the products generated in GS2 or of those generated off-line in the TCE with the ASCAT PPF
3 INTERNAL EUMETSAT VALIDATION
Following AD1 below are the tasks to perform for ASCAT-B product commissioning highlighting those addressed (green) or partially addressed (orange) for the purpose of assessing the readiness of the products to be open to pre-operational dissemination
1 Internal calibration ndash locking of calibration constants 2Level 1a product ndash monitoring of instrument telemetry 3Level 1a product ndash reference function monitoring 4 Initial calibration ndash verification and refinement 5Gain compression monitoring 6External calibration ndash generation of normalisation tables 7External calibration ndash geolocation accuracy assessment 8External calibration ndash monitor ASCAT pulse shape 9Level 1b product ndash monitoring of swath geometry 10 Level 1b product ndash validation using rainforests 11 Level 1b product ndash validation using ocean 12 Level 1b product ndash validation using sea ice 13 Level 1b product ndash quality flags assessment 14 Tuning and modification of product generation 15 Overall assessment and reporting
In the following sections we will report on the activities and results associated to each task
31 Internal calibration ndash locking of calibration constants
The initial setting at launch was all six cCal parameters set to a value of 1 (ASCA_PRC_v10) This resulted in a Power Gain Product (PGP) values of the order of 108
(rather than the expected value of 1) and backscatter values of around 40 dB lower than expected
A new auxiliary file (ASCA_PRC_xx_M01 v11) with the cCal values taken from ASCAT-A was used to re-generate the data off-line
95297160e-09 96879270e-09 96960770e-09 95415500e-09 97042420e-09 95061350e-09
This produced both PGP and sigma0s in the expected range (see Appendix A)
Page 7 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- EPS Product Quality Monitoring validation environment (EPQM VAL) and daily reports - httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring
13 Applicable and Reference Documents
131 Applicable Documents
AD1 ASCAT Verification Calibration and Validation Plan EUMMETTEN110187 AD2 EPS Programme Calibration and Validation Overall Plan
EUMEPSSYSPLN02004
132 Reference Documents
RD1 ACAT CalVal schedule - DOCSLIB220251 RD2 ASCAT Instrument Operations Manual (IOM) ref MO-MA-DOR-SC-0008
14 List of acronyms and abbreviations
ASCAT-A Advanced SCATterometer on METOP-A (Flight Model 2) ASCAT-B Advanced SCATterometer on METOP-A (Flight Model 1) ASCAT SAG ASCAT Science Advisory Group CAL Calibration CalVal Calibration and Validation CSIC Consejo Superior de Investigaciones Cientiacuteficas DPS Data Processing System (for product quality monitoring) ECMWF European Centre for Medium Range Weather Forecasting EPQM OPEVAL EPS Product Quality Monitoring OPErational and VALidation environments EPS European Polar System EUMETSAT European Organisation for the Exploitation of Meteorological Satellites GCM Gain Compression Monitoring GS1 Operational Ground Segment GS2 Validation Ground Segment GS3 Integration Ground Segment HKTM House Keeping TeleMetry Hrx Receive Filter Shape H-SAF Satellite Applications Facility on support to Hydrology and Water Management ISP Instrument Source Packet METOP METeorological Operational Platform NOAA National Atmospheric and Oceanic Administration NOC NWP Ocean Calibration NWP Numerical Weather Prediction NP Noise Power NTG Normalisation Table Generation OSI-SAF Ocean and Sea Ice Satellite Applications Facility PDU Processing Data Unit PGP Power Gain Product PPF Product Processing Facility SIOV System In Orbit Verification SPVT Science and Products Validation Team SWET Software Engineering Task TCE Technical Computing Environment WVC Wind Vector Cell
Page 6 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
2 PROTOTYPE RESULTS
As a sanity check some basic parameters from the products have been generated with an offshyline standalone prototype and compared against the product contents This tool is however a flexible and highly configurable implementation of the processing algorithms and as such not under strict configuration control The validation results below are exclusively based on the contents and quality checks on the products generated in GS2 or of those generated off-line in the TCE with the ASCAT PPF
3 INTERNAL EUMETSAT VALIDATION
Following AD1 below are the tasks to perform for ASCAT-B product commissioning highlighting those addressed (green) or partially addressed (orange) for the purpose of assessing the readiness of the products to be open to pre-operational dissemination
1 Internal calibration ndash locking of calibration constants 2Level 1a product ndash monitoring of instrument telemetry 3Level 1a product ndash reference function monitoring 4 Initial calibration ndash verification and refinement 5Gain compression monitoring 6External calibration ndash generation of normalisation tables 7External calibration ndash geolocation accuracy assessment 8External calibration ndash monitor ASCAT pulse shape 9Level 1b product ndash monitoring of swath geometry 10 Level 1b product ndash validation using rainforests 11 Level 1b product ndash validation using ocean 12 Level 1b product ndash validation using sea ice 13 Level 1b product ndash quality flags assessment 14 Tuning and modification of product generation 15 Overall assessment and reporting
In the following sections we will report on the activities and results associated to each task
31 Internal calibration ndash locking of calibration constants
The initial setting at launch was all six cCal parameters set to a value of 1 (ASCA_PRC_v10) This resulted in a Power Gain Product (PGP) values of the order of 108
(rather than the expected value of 1) and backscatter values of around 40 dB lower than expected
A new auxiliary file (ASCA_PRC_xx_M01 v11) with the cCal values taken from ASCAT-A was used to re-generate the data off-line
95297160e-09 96879270e-09 96960770e-09 95415500e-09 97042420e-09 95061350e-09
This produced both PGP and sigma0s in the expected range (see Appendix A)
Page 7 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
2 PROTOTYPE RESULTS
As a sanity check some basic parameters from the products have been generated with an offshyline standalone prototype and compared against the product contents This tool is however a flexible and highly configurable implementation of the processing algorithms and as such not under strict configuration control The validation results below are exclusively based on the contents and quality checks on the products generated in GS2 or of those generated off-line in the TCE with the ASCAT PPF
3 INTERNAL EUMETSAT VALIDATION
Following AD1 below are the tasks to perform for ASCAT-B product commissioning highlighting those addressed (green) or partially addressed (orange) for the purpose of assessing the readiness of the products to be open to pre-operational dissemination
1 Internal calibration ndash locking of calibration constants 2Level 1a product ndash monitoring of instrument telemetry 3Level 1a product ndash reference function monitoring 4 Initial calibration ndash verification and refinement 5Gain compression monitoring 6External calibration ndash generation of normalisation tables 7External calibration ndash geolocation accuracy assessment 8External calibration ndash monitor ASCAT pulse shape 9Level 1b product ndash monitoring of swath geometry 10 Level 1b product ndash validation using rainforests 11 Level 1b product ndash validation using ocean 12 Level 1b product ndash validation using sea ice 13 Level 1b product ndash quality flags assessment 14 Tuning and modification of product generation 15 Overall assessment and reporting
In the following sections we will report on the activities and results associated to each task
31 Internal calibration ndash locking of calibration constants
The initial setting at launch was all six cCal parameters set to a value of 1 (ASCA_PRC_v10) This resulted in a Power Gain Product (PGP) values of the order of 108
(rather than the expected value of 1) and backscatter values of around 40 dB lower than expected
A new auxiliary file (ASCA_PRC_xx_M01 v11) with the cCal values taken from ASCAT-A was used to re-generate the data off-line
95297160e-09 96879270e-09 96960770e-09 95415500e-09 97042420e-09 95061350e-09
This produced both PGP and sigma0s in the expected range (see Appendix A)
Page 7 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Following that the PGP locking was carried out as planned using the following files from GS2 by using data from latitudes similar to the ASCAT ground transponders
ASCA_xxx_00_M01_20120926073600Z_20120926073900Z_N_C_20120926090117Z ASCA_xxx_00_M01_20120926073900Z_20120926074200Z_N_C_20120926090344Z ASCA_xxx_00_M01_20120926074200Z_20120926074500Z_N_C_20120926090611Z ASCA_xxx_00_M01_20120926074500Z_20120926074800Z_N_C_20120926090838Z
A new auxiliary file with the cCal values corresponding to PGP locking was derived
7449816e-09 7523634e-09 7545969e-09 7456065e-09 7515879e-09 7448308e-09
Those were chosen to generate the following values of PGP for the above four files
beam latitude pgp 0 39616432 100000 1 39597544 100000 2 39593667 100000 3 39604914 100000 4 39581439 100000 5 39596602 099990
This set of cCal values were used to update the ASCAT PPF configuration (ASCA_PRC_xx_M01 v12)
Figures 1 and 2 provide plots showing the change in the daily monitoring reports
Figure 1 PGP product for all beams during 021012 recording the internal calibration locking (EPQM VAL 02102012 daily report)
Page 8 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 2 PGP orbit statistics (green=minimum value red=maximum value black=average) for several days leading up to the internal calibration locking on the 021012 (TCE ASCAT DPS
051012) Here the PGP dips can be observed in beam 1 but not in beam 0 (refer to section 331 for this issue)
32 Monitoring of instrument telemetry
Time series of instrument telemetry included in the science packets and in the house keeping telemetry (HKTM) packets are included in Appendix C These values are interpolated telemetry appended to the individual ASCAT-B measurements The time series reveal that all telemetry is within the expected thresholds as given in the ASCA_PRC_xx_M01 file for near real time Level 1a product flagging
Note that the two vertical lines noticed in the powervoltage plots correspond to unavailable HKTM files and are not telemetry outliers Some of the outliers for the HPA Powers have been contrasted with similar plots in the instrument team telemetry monitoring tool and they correspond to calibration sequences taking place daily now for ASCAT-B Not all the events are reported though either due to the PPF or the EPQM so this needs investigation
For the temperature ADC and AD parameters plots have been generated using points and not lines in order see any trends more clearly A more detail outlier check is still ongoing
33 Monitoring of reference functions
331 Power Gain Product (PGP)
Throughout the first weeks of the System In Orbit Verification (SIOV) several excursions in the value of the PGP product for beams 1 2 and 4 have been observed An example is provided in Figure 3
Page 9 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 3 PGP product for all beams during 041012 recording an occasion of PGP excursion for beams 12 and 4 (EPQM VAL 0410)More cases in Appendix D
Investigation of the different components that go into the PGP computation pointed to a correlation with excursions of the integrated calibration powers (figure 4)
Figure 4 PGP and integrated calibration power measurements for a PGP excursion event on 2609
Investigation by industry revealed a potential cause in temporary small changes in one of the circulators (return loss or insertion loss) within the Scatterometer Front End (SFE) since the three affected antennas are connected to the same half of the switch matrix and the calibration signals of these three antennas go via this same half (circulators 67 and 8) EUMEPSAR14403 was raised to track this problem
The observed steps in the PGP (eg from 126 to 128 in figure 4) correspond to only about 007 dB An attempt was made to compare the PGP steps with the raw echoes in order to verify that they exhibit the same behaviour in which case there would not be any expected impact in the final sigma0 quality The results were not conclusive since in some cases the behaviour of the signal is consistent with the PGP change (top two examples in figure 5) while in other cases it is not (top bottom examples)
Page 10 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 5 Scaled raw power PGP product and measurement signal for several occasions of PGP excursions More cases in Appendix E
Then early SIOV ASCAT-A data was inspected in order to compare the early behaviour of the two instruments in order to assess the likelihood of this being a transient phenomenon as the instrument settles into operations No evidence of this problem on early ASCAT-A data was found
An automatic check in the daily DPS reports was introduced to detect PGP jumps by simply subtracting the PGP values at the beginning and end of each 3-min Processed Data Unit (PDU) and plotting the values Examples of this plot are provided in figure 6 and help us detecting new cases day by day The most recent example (Figure 6 bottom) shows that these events are still happening but much less often than they did at the beginning of the mission In Appendix E some other examples of the PGP excursions have been recorded where not only the magnitude but also the duration of the events can be seen
As complementary information time series of the Instrument Source Packet (ISP) values contributing to the PGP are provided in Appendix F
Page 11 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 6 3-min interval differences of PGP values in Level 1a products (TCE DPS)during a 12 day period in mid October (above) and late November (below) (TCE DPS)
332 Noise power (NP)
Figure 8 shows time series of NP Values exceeding 900 are considered outliers and are shown to happen in all beams Otherwise values remain between 600 and 800 as for ASCAT-A
Page 12 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 8 NP orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1710 (TCE DPS)
Figure 9 further shows all measured NP values since instrument switch-on In order to monitor the occurrence of outliers those values exceeding a value of 900 have been plotted on a map in figure 10 The geographical distribution and density follows the pattern given by ASCAT-A
Page 13 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 9 Time series of all measured noise power values for each beam (EPQM VAL)
Figure 10 Coverage map of NP values exceeding a value of 900 (EPQM VAL)
333 Receive filter shape (hrx)
Page 14 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The EPQM daily reports show the daily average hrx In order to look into variations of this shape within the orbit all the values of hrx where plotted for one day (1010) together with the average hrx shape as shown in figure 11
Figure 11 Average hrx for 1010 (red) together with all the individual hrx (black) during that period (TCE DPS)
A time series of the average distance of the individual hrx values to the mean for a week of data revealed an outlier as it can be seen in figure 12
Figure 12 Time series (green=minimum value red=maximum value black=average) of (hrx-hrx_mean)hrx mean for the period of one week 1010-1710 (TCE DPS)
Investigating the time series of raw noise values for that day this occurrence was related to an NP outlier case of 6500 at about 0300 h The effect was further confirmed by plotting the hrx curves around that time (from 0200 to 0400 h) shown in figure 13 which confirm the impact particularly clear for nodes 180-220
Page 15 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 13 Hrx samples between 2 and 4 am on 1710 around the time of the NP outlier at 3 am (TCE DPS)
This is just one case and we have never looked for those in ASCAT-A so this is an interesting result that we would like to look further into during CalVal The number of occurrences of these cases is very small though and mostly over land (see section 332) EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape The fix of this problem is however not considered critical for the end of Commissioning
Something we have never explored for ASCAT-A and would like to do so now for both instruments is how the shape of the hrx varies in time We know it does from the monitoring of the average values of four samples available in EPQM (see figure 14 for the time series of ASCAT-B so far) but we donrsquot know exactly how in more detail because the variations shown in figure 14 could be either vertical or lateral movements and just from the monitoring of these four samples it cannot be determined which We would like to investigate this further in the next few weeks by normalising each filter shape by the value for a given sample (eg the middle one 128) and monitor the variation of fix 10 min averages within the orbit for a period of weeks and months This we expect will help understanding the plots shown in figure 14 and the similar variations also observed for ASCAT-A in longer time frames
Page 16 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 14 Time series of values of hrx for samples 30 100 150 and 200 The bottom plot monitors simply the maximum values of the hrx out of the full range of 256 samples (EPQM VAL)
Page 17 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
34 Gain compression monitoring
The first Gain Compression Monitoring (GCM) procedure for ASCAT-B was carried out during early SIOV It consisted of two consecutive GCM sequences in Svalbard visibility The expected GCM files were generated in GS2 and further analysed off-line (figure 15) showing that all the check parameters are within the expected range [RD2]
zgain 07580 ptest 00117 check1 20710
Figure 15 Gain Compression Monitoring checks for the first GCM sequence on 2509(TCE DPS)
35 Monitoring of transponder calibration (CAL) passes and geolocation
At the time of writing this report the transponder maintenance mission going on in Turkey for the T2 site has concluded The ASCAT-B external calibration campaign has started on 11102012 and will run until 07122012 (ie 2 cycles of 29 days) The back-up period for the collection of any missed passes is from 08122012 03022013 (ie two further cycles of 29 days) The radar backscattering cross-sections of the transponders correspond to the baseline configuration (see Appendix I)
The first ASCAT external calibration operation was on 2509 in Svalbard visibility The first ASCAT external calibration over the transponders was also later on that day where T1 and
Page 18 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
T3 were operated Figure 16 provides an image of the ASCAT measurements for those two first passes
Figure 16 Raw power echoes for FOREMIDAFT beams corresponding to the 2509 ASCAT-B external calibration operationsT1 and T3 echoes are visible in the transponder over flight in Turkey
(right hand side picture)
We can use the transponder passes acquired at the time of writing this report to estimate the products geolocation accuracy as the difference between the estimated location of the transponder peaks and the actual precise position of the transponders on ground This is shown in table 1 An average over all available passes (excluding obvious outliers) provides a first estimation of the geolocation accuracy of 31 km
A first look at the measured gain values is also possible There have been some outliers and also some failed passes as it is expected for external calibration campaigns especially during a maintenance mission but overall it is shown how the transponders are pass by pass helping build the actual antenna gain patterns expected to differ from the model gain patterns Figure 17 illustrates this
No further analysis of the transponder calibration data is provided in this report as the external calibration campaign for ASCAT-B is on-going The results of the external calibration campaign will be provided prior to the release of the operational calibration of ASCAT-B
Page 19 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Date Time geolocation 2012-09-25 1324 (empty) -2012-09-25 1430 (empty) -2012-09-26 0806 30 km 2012-09-26 1927 33 km 2012-09-29 1821 46 km 2012-09-30 0818 18 km 2012-09-30 1800 31 km 2012-10-01 0800 28 km 2012-10-01 1921 37 km 2012-10-02 1900 36 km 2012-10-03 0718 47 km 2012-10-04 0657 175 km 2012-10-04 1818 40 km 2012-10-05 0815 21 km 2012-10-05 1757 30 km 2012-10-06 0754 40 km 2012-10-06 1918 48 km 2012-10-07 1857 16 km 2012-10-08 0715 40 km 2012-10-08 1836 (empty) -2012-10-09 0654 34 km 2012-10-09 0833 (empty) -2012-10-09 1815 27 km 2012-10-10 0812 20 km 2012-10-10 1754 31 km 2012-10-10 1933 32 km 2012-10-11 0751 19 km 2012-10-11 1912 29 km 2012-10-12 0733 30 km 2012-10-12 1854 18 km 2012-10-13 1833 29 km 2012-10-14 0830 19 km 2012-10-14 1812 41 km 2012-10-15 0809 29 km 2012-10-15 1930 27 km 2012-10-16 1909 28 km
Table 1 List of available transponder passes (any combination of transponders) and the estimated distance of the transponder peak to the actual transponder location worse case out of all beams and
all transponder measurements available for that pass (TCE DPS)
Page 20 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 17 Plot of available antenna gain measurements from each transponder and each beam plotted together with the antenna model gain functions (TCE DPS)
Page 21 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
36 Initial calibration ndash verification and refinement
With the internal calibration locking (see section 31) the ASCAT-A and ASCAT-B cross-calibration improved being reduced from approximately -12 dB to +-03 dB Figure 18 shows a time series of the difference between ASCAT-A and ndashB pass-based average gamma0 values in time and figure 19 shows the gamma0 patterns for ASCAT-A and ndashB with respect of incidence angle based on the SZO products in GS2
Figure 18 Cross-calibration between ASCAT-A and ASCAT-B SZO products in GS2 over the rainforest Each point is the difference between to fitted time series on gamma0 statistics for all
ASCAT-A and -B passes over the rainforest one average point per pass (TCE DPS)
Page 22 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 19 Gamma0 patterns over the rain forest from ASCAT-A and ASCAT-B SZO products in GS2For ASCAT-A an orbit cycle is used (120912-101012) while for ASCAT-B only seven days
(041012-111012) ((TCE DPS)
Page 23 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
A pre-requisite to start comparing the ASCAT-A and ndashB calibrations was the reach of the Metop-B nominal orbit which happened on 2809 Then following AD1 seven days of available ASCAT-B SZF data over the rainforest were used to calculate an incident angle-dependent preliminary cross-calibration with ASCAT-A in the form of a set of new antenna patterns In order to do that the most accurate contemporary rainforest picture from ASCATshyA was used as a reference generated from an orbit cycle of data The sensing times used from both ASCAT-A and ndashB are provided in Appendix H
The testing of the cross-calibration was carried out in the TCE using the ASCAT PPF both configured to carry out normalisation table generation (NTG) and Level 1 runs The detailed configuration of these test scenarios is provided also in Appendix H
Figure 20 provides an overview of the normalisation factors difference between the reference and new calibration which shows that the correction is in the right direction to compensate the differences between ASCAT-A and ndashB over the rainforest from figure 19 for all of the beams
Figure 20 normalisation table corresponding to the new cross-calibration ndashreference normalisation table for orbit time 0 red lines limit the sample range used for the Level 1b spatial averaging hence
the x range of the plots in figure 19
Page 24 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 provides an overview beam per beam of the differences in calibration between ASCAT-A and ndashB of the SZF products before applying the preliminary cross calibration Figure 22 shows the comparison after applying the cross-calibration for the same input ASCAT-B data set
Finally in order to check the sensitivity of this result to the short period of data used a set of additional five days of ASCAT-B rainforest passes was processed with the new cross-calibration and compared to the same ASCAT-A rainforest reference The results are provided in figure 23 and show some punctual deviations in the MID beams with respect to the previous good match These are of a maximum value of +- 01 dB while the agreement remains within +- 005 dB for most of the incidence angle range in all beams This gives an idea of the robustness of the method in spite of the short time period of data available
This set of antenna patters generated offline were used to update the ASCAT PPF configuration (ASCA_XCL_xx_M01 v12)
Figure 28 shows the evolution of the calibration of ASCAT-B with respect of a model rainforest gamma0 from One month of ASCAT-A data during October 2012 confirming that the calibration between ASCAT-A and ASCAT-B was reduced indeed to a difference within 01 dB
As a sanity check before activating this calibration on the operational ground segment several passes over the rainforest before and after the configuration change in GS2 were examined in order to make sure that the ASCAT-B gamma0 patterns get closer to those from ASCAT-A This point was confirmed as shown in the plots in Appendix J
Page 25 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 21 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) before applying the preliminary cross-
calibration
Page 26 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 22 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-111012) after applying the preliminary cross-
calibration
Page 27 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 23 Gamma0 patters over the rainforest derived from SZF data corresponding to ASCAT ndashA (120912-101012) and ASCAT-B (041012-161012) after applying the preliminary cross-
calibration
Page 28 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 28 (above) Difference in gamma0 between ASCAT-B rainforest passes and a model based on ASCAT-A derived from data during October 2012 displayed as a time series running up to beginning of November The first transition corresponds to the locking of the calibration constants The second transition corresponds to the introduction of the preliminary cross-calibration (below) Same plot as above but covering a more recent time period running op to beginning of November (TCE DPS)
Page 29 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Level 1b product monitoring of swath geometry
A check of the swath geometry consists of verifying that the azimuth and incidence angle values are those expected Figures 24 and 25 show those for ASCAT-B which are identical to the ones we observe daily for ASCAT-A as expected For the incidence angle (figure 25) and due to the fact that there are continuous data gaps due to the transponder calibration campaign we can see traces of ASCAT PPF EUMEPSAR13672
Figure 24 Orbit statistics (green=minimum value red=maximum value black=average) for 15 days leading to 1510 of Level 1b FORE-MID and MID-AFT azimuth angle differences for the Left (above)
and Right (below) swaths (TCE DPS)
Page 30 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 25 Incidence angle orbit statistics (green=minimum value red=maximum value black=average) for 15 days of Level 1b data leading to 1510 (TCE DPS)
37 Level 1b product first look at Kp
Although not explicitly listed in the CalVal plan as a specific activity since it is considered as part of the natural target validation we have looked preliminarily at statistics of Kp values as a sanity check Figures 26 and 27 show statistics during the last three weeks of data for ASCAT-B with respect to incidence angle which look as expected Also the statistics in the EPQM daily reports look almost identical to those from ASCAT-A The values are thus very credible pending of course a full validation during the CalVal activities following the release of this first version of the products
Page 31 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 26 Level 1b SZO Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 32 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 27 Level 1b SZR Kp statistics in dB (above panels) and in (below) for the period between 2509 and 1610 (EPQM VAL)
Page 33 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
38 Flag validation
Complete flag validation is ongoing The only issue identified so far is an error in the solar array interference flag for ASCAT-B where the latitude location of the measurements expected to be affected by the interference looks very different with respect to ASCAT-A (Figure 36) Given that the two satellites are in the same orbit it was expected that the solar array flag would be very similar The problem was tracked down to a configuration error in the solar array flagging algorithm for ASCAT-B where the autumn equinox date had been used where the spring equinox date should have been EUMEPSAR14498 has been raised and a fix needs to be provided before the products are declared operational
Figure 36 F_usable flag in ASCAT-A (above) and ASCAT-B (below) products the regular pattern being triggered for the FORE beam by the solar array flag algorithm (EPQM VAL)
Page 34 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
4 EXTERNAL PARTNER VALIDATION
Feedback has been received from ECMWF the OSI SAF (KNMI) and the H-SAF (TU-Wien) With that wind and soil moisture applications are covered We have not received feedback from the sea ice monitoring community though and we will actively seek it before the start of operational dissemination
41 OSI-SAF (KNMI)
Global comparison based on 15 orbits of ASCAT-A and ASCAT-B shows that even before Numerical Weather Prediction (NWP) ocean calibration (NOC) the winds from both missions are basically identical and well within requirements which are 2 ms RMS wrt ECMWF winds in both U and V components (shown in bottom plots in figures 29 and 30) Figure 31 examines in more detail the dependency of these statistics with respect to Wind Vector Cell (WVC) which confirms the similarity of the data It was noted that the compared wind products are derived at KNMI using a CMOD5-based geophysical model function and it is expected that inter-comparisons of CMOD-6 based winds would provide even closer results without the need for static or NOC bias corrections
As well as the global statistics discussed above collocations have been obtained in the tropical areas where the right and left swath of both instruments for consecutive orbits overlap within 50 minutes of time difference The analysis of collocations in Figure 32 shows a very good agreement too Collocations at 50 minutes time interval have been identified as a good opportunity to study convectivity as they allow observing changes in rapid developing tropical convective systems as shown in Figure 33 It would be interesting to evaluate such differences in conjunction with the MSG Global Instability Index (GII) products over the Atlantic
Next work by KNMI will concentrate on expanding the scope of the statistical comparisons as well as doing triple collocation with buoy data
Page 35 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 29 Wind speed wind direction and wind component scatter plots between ASCAT-A vs ECMWF collocated forecast winds for orbits 31193 to 31208 Courtesy of OSI SAF (KNMI)
Page 36 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 30 Wind speed wind direction and wind component scatter plots between ASCAT-B vs ECMWF collocated forecast winds for orbits 507 to 522 Courtesy of OSI SAF (KNMI)
Page 37 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 31 Above Wind speed bias and standard deviation with respect to NWP forecast winds of both ASCAT-A and ASCAT-B SZR-based winds plotted with respect to WVC for the same orbits as in figures 29 and 30 Below Signed distance to the cone for the same retrievals Courtesy of OSI SAF
(KNMI)
Page 38 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Figure 32 Probability Density Function of ASCAT AB collocations for wind speed (left panel) and wind direction (right panel) respectively Low latitude ie -10ltlatlt10
Courtesy of CSIC (Wenming Lin)
Figure 33 Consecutive passes of ASCAT-A (red) and ASCAT-B (blue) showing convective downbursts for ASCAT-B as the convective system starts developing Courtesy of OSI-SAF (KNMI)
Page 39 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
42 ECMWF
Analysis of bias corrections of ASCAT-A and ASCAT-B with respect to NWP-based sigma0 show very similar behaviour (Figure 34)
Figure 34 Sigma0 bias corrections applied to ASCAT-A (black) and ASCAT-B (red) SZO products with respect to CMOD54 plotted as a function of WVC Courtesy of ECMWF
Further work at ECMWF will be on studying the impact of ASCAT-B assimilation on forecast skill Since Dec 17th ECMWF is monitoring operationally the winds they process directly from our Level 1 (httpwwwecmwfintproductsforecastsdchartsmonitoringsatellitewindscattmetopb)
43 H-SAF (TU-Wien)
Validation over the Amazonian rainforest based on data from 2210 to 511 shows that the comparison of sigma0 normalised to 40 deg is very good with Δσ0(40deg) = 000101 dB
Figure 35 comparison between simg0 normalised at 40 deg over the Amazonian rainforest based on data from 2210 and 511 Courtesy of H-SAF (TU-Wien)
Page 40 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
This allows using the current operational Level 2 soil moisture processor with the same exact configuration for ASCAT-A and ASCAT-B Specific feedback on the quality of the soil moisture data will be covered in the ASCAT-B soil moisture validation report and is not included here
5 CONCLUSIONS
51 Product Validation Summary
During this first phase of SIOV and CalVal we have addressed several of the activities outlined in AD1
From the telemetry and Level 1a analysis the instrument shows to be performing generally as expected GCM and CAL analysis also show a healthy instrument and transponders system with a first estimation of the geolocation accuracy of 3 km also comparable to that of ASCAT-A
The preliminary cross-calibration with ASCAT-B has been carried out achieving an accuracy as measured with only two weeks of data of +- 01 dB over the rainforest This figure has not varied significantly during the rest of the first 29 day cycle and it has been confirmed by the CalVal partners The OSI-SAF has furthermore reported that the quality of the ASCAT-B winds is equivalent to those of ASCAT-A even before their NOC corrections
These results are encouraging and sufficient to start pre-operational dissemination to all users When the external calibration with transponders is completed and the results analysed a final update of the calibration for Commissioning is expected No further tuning of the calibration is expected until then
In spite of all the good feedback received it is noted that prior to declaring the products operational feedback from calval partners on sea ice applications would be necessary and should be actively seeked
Analysis of the swath geometry and Kp show that the spacecraft orbit attitude as well as the processor geolocation algorithm implementation are comparable for ASCAT-A and B
52 Product Validation Issues
A few issues require further investigation andor monitoring none of which however represent an impediment to release the current ASCAT-B data to users
PGP excursions need further monitoring once the whole spacecraft reaches its nominal thermal state for operations the associated EUMEPSAR14403 needs also following with industry by the instrument team
NP outliers and hrx effects need further evaluation also for ASCAT-A EUMEPSAR14485 has been raised to record this issue which identifies a mitigation action through the ASCAT processor discarding NP outliers in the calculation of the receive filter shape
Page 41 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
The solar array flags for ASCAT-B are not configured correctly and an update of the ASCAT PPF configuration is necessary EUMEPSAR14498 has been raised to record this issue
A reporting issue without direct impact on product quality is the pending reconciliation of the CHART and EPQM reporting on HPA Power outliers during calibration sequences
53 Actions for Product Rollout
No changes foreseen
531 Time Schedule
Start of pre-operational dissemination on EUMETCast and GTS on 0412
532 User Notification
Already sent
533 Verification
None
534 Document Update
None necessary for the pre-operational dissemination Product guide updates will be prepared for the start of operational dissemination
535 Web Update
None
6 RECOMMENDATION
We recommend that the pre-operational dissemination is started for ASCAT-B Level 1 products
Page 42 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX A SUMMARY OF ANALYSIS OF FIRST 5 MINUTES OF DATA ON 2309
2309 ndash actions and issues
- ASCAT_NTB for M01 ingested in GS2e to allow Level 1 cold start - PDUMon did not display in G2 the first 5 min of ASCAT-B Level 0 data (shown below
picture generated off-line) PGF problem identified AR raised EUMEPSAR14334
2409 ndash Analysis of the first 5 min of data
Initially the sigma0 (in the processed L1b) and then the PowerGainProduct PGP (in the processed L1A) were found to be way out of the expected calibration After some investigation the problem was identified as a wrong parameter in the PRC file (cCal set to 1) This was corrected by setting cCal to those for ASCAT-A and the data was re-processed in the TCE Checks showed that ASCAT-A and ASCAT-B were providing remarkably similar sigma0s ASCAT_PRC_xx_M01 v11 was rolled out on GS23
To illustrate this
(1) Maps of ASCAT-B (the colour one is an RGB of FORE MID AFT) and below also the pass corresponding to ASCAT-A 35 minutes later over the same area As you can see at first sight the maps look remarkably the same in the same colour scale (no manipulation has been made of the colour scales)
Page 43 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(2) To check the comparable calibration range histograms of the FOREMIDAFT sigma0s for ASCAT-B are also provided and can be compared very nicely with those corresponding to the ASCAT-A data (histograms are not normalised but peaks are centred around the same place)
Page 44 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(3) The PGP calculated in the L1A processing for ASCAT-B is as expected now close to 1 ndash this will be further refined during CalVal as planned
Page 45 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
(4) The raw noise segments also show the expected behaviour (around 800)
So all in all from just those 5 minutes of data we can say that the instrument is behaving as expected and that the processor (considering the necessary update of the ASCA_PRC file) is expected to provide reasonable sigma0s
Page 46 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX B SUMMARY OF ANALYSIS OF FIRST 100 MINUTES OF DATA ON 2509
Analysis of 100 min of data see below some illustrations
- After the setting of cCal to the Metop-A ones the s0 from both ASCATs are very similar (slides 1-6) Note however that this is no quantitative statement but it basically says that the data make sense and now we can start with calibrating it against ASCAT-A first and then absolutely against the transponders) To note specifically is the good agreement of the ASCAT-AB data over stable backscatter areas in Antarctica Geolocation also looks good and Kp offers reasonable values
- In the L1A analysis we see some dips of the PGP (averaged over 101 echoes) in ASCAT-B which we donrsquot see in ASCAT-A (slide 7) They have no impact on the sigma0 Otherwise the values are in the expected range and have the expected variation along the orbit The NP looks very similar too nothing to say here The appended HKTM also looks very similar (not shown) nothing to report there from this 100 min of data
Page 47 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 1 First 100 min of ASCAT-B data ndash NRCS RGB
Slide 2 First 100 min of ASCAT-B+A data ndash NRCS RGB
Page 48 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 3 Zoom over Africa ASCAT-B+A ndash NRCS RGB
Slide 4 Zoom over Africa ASCAT-B+A ndash KP RGB
Page 49 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 5 Zoom over Antarctica ASCAT-B+A ndash NRCS RGB
Slide 6 Zoom over Antarctica ASCAT-B+A ndash NRCS KP
Page 50 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Slide 7 L1A ndash PGP and NP for ASCAT-A (top 2 panels) and ndashB (bottom 2 panels)
Page 51 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX C MONITORING OF INSTRUMENT TELEMETRY
Time series of SFE and ANT temperatures in the ASCAT science ISPs Scaling factor to apply is 10^2 Vertical thresholds applied in the Level 1 processor are (-17 to 62) for SFE and (-27 to 56) for ANT
Page 52 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment voltages from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 53 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment powers from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 54 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of equipment temperatures from HKTM telemetry appended to each ASCAT-A ISP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 55 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of ADC voltages gain and offsets from HKTM telemetry appended to each ASCAT-A SP Vertical range corresponds to current thresholds in the Level 1 operational processor
Page 56 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX D EXAMPLES OF PGP EXCURSIONS IN DETAIL
Daily time series of the Level 1A PGP values for ASCAT-B since the instrument switch-on can be found in the EPQM reports
(httptcwebeumetsatintATOVS_MonitoringEPQM_Monitoring)
Here just a few cases of different duration are shown as an example There have been a number of days without drops but so far they are fewer than those with drops
510
810
1110
1210
Page 57 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX E ANALYSIS OF PGP VS RAW ECHO VARIATIONS
Page 58 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Page 59 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX F INPUT ISP VALUES TO THE PGP CALCULATION
Time series of Integrated Transmitted Powers
Page 60 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Reflected Powers
Page 61 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Time series of Integrated Calibration Powers
Page 62 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX G PRELIMINARY CROSS-CALIBRATION INPUT L0 DATA AND PPF CONFIGURATION
Derivation of the preliminary cross-calibration using SZF data from ASCAT-A (GS1) and ASCAT-B (GS2) from the following files containing measurements from the Amazon rainforest For the derivation of the new ASCA_XCL_xx_M01 file offline tools in the TCE were used
ASCAT-A ASCA_SZF_1B_M02_20120912011800Z_20120912012659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120912135700Z_20120912140559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913005700Z_20120913010559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913023600Z_20120913024459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120913133600Z_20120913134459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914021500Z_20120914022359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120914131459Z_20120914132659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915015400Z_20120915020259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915125400Z_20120915130559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120915143600Z_20120915144459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916013300Z_20120916014459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120916141500Z_20120916142359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917011159Z_20120917012359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120917135359Z_20120917140259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918005400Z_20120918010259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918023300Z_20120918024159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120918133300Z_20120918134159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919021200Z_20120919022059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120919131200Z_20120919132059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920015059Z_20120920015959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920125100Z_20120920125959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120920142959Z_20120920144159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921013000Z_20120921013859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120921140900Z_20120921142059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922010900Z_20120922012059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120922135100Z_20120922135959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923005059Z_20120923005959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923022959Z_20120923023859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120923133000Z_20120923133859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924020900Z_20120924021759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120924130900Z_20120924131759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925014800Z_20120925015659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925124800Z_20120925125659Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120925142700Z_20120925143859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926012659Z_20120926013559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120926140559Z_20120926141759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927010600Z_20120927011759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927024500Z_20120927025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120927134800Z_20120927135359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928022400Z_20120928023559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120928132700Z_20120928133559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929020559Z_20120929021459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929130600Z_20120929131459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120929144800Z_20120929145359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930014500Z_20120930015359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20120930142400Z_20120930143559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001012400Z_20121001013259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121001140300Z_20121001141459Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002010300Z_20121002011159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002024159Z_20121002025359Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121002134500Z_20121002135059Z_N_O_xxxxxxxxxxxxxxZ
Page 63 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
ASCA_SZF_1B_M02_20121003022100Z_20121003023259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121003132100Z_20121003133259Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004020300Z_20121004021159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004125959Z_20121004131159Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121004144200Z_20121004145059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005014200Z_20121005015059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121005142100Z_20121005142959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006012100Z_20121006012959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121006140000Z_20121006140859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007005959Z_20121007010859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007023900Z_20121007025059Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121007133859Z_20121007134759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008021800Z_20121008022959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121008131800Z_20121008132959Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009015700Z_20121009020559Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009125659Z_20121009130859Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121009143859Z_20121009144759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010013900Z_20121010014759Z_N_O_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M02_20121010141800Z_20121010142659Z_N_O_xxxxxxxxxxxxxxZ
ASCAT-B ASCA_SZF_1B_M01_20121004135359Z_20121004140259Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005005100Z_20121005005959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005023000Z_20121005024159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121005133259Z_20121005134159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006020900Z_20121006022059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121006131200Z_20121006132059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007015100Z_20121007015959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007125100Z_20121007125959Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121007143000Z_20121007144159Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008012959Z_20121008013859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121008140900Z_20121008142059Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009010859Z_20121009011759Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121009135100Z_20121009135659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010004800Z_20121010005659Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010022659Z_20121010023859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121010132700Z_20121010133859Z_N_C_xxxxxxxxxxxxxxZ ASCA_SZF_1B_M01_20121011020600Z_20121011021759Z_N_C_xxxxxxxxxxxxxxZ
The testing of this new XCL file consisted of generating two sets of ASCAT-B SZF files one with the reference XCL calibration and another one with the new one but otherwise using static NTB files from the same orbit
Those two sets were then compared with the reference ASCAT-A rainforest gamma0 files above
The generation of this two set of ASCAT-B SZF files was done in the TCE with the ASCAT PPF both for NTG and Level 1 runs The processing configuration for the tests was
ASCAT PPF v81
Aux files - ASCA_PRC_xx_M01 v12 - ASCA_INS_xx_M01 v10 - For NTB runs (reference calibration and new calibration) the OSV file used was
xxxx_OSV_xx_M01_20121002000000Z_20121005120000Z_20121002062602Z_FD Fx_FDORBPREDI taken from GS2 and the orbit number taken was 204
Page 64 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
- ASCA_XCL_xx_M01 for reference run was v10 - ASCA_XCL_xx_M01 for new run was v12
Level 0 slices derived from the GS2 PDU feed into TCE were used
(1) For the sanity check test using the same rainforest passes than those used to generate the XCL file
ASCA_xxx_00_M01_20121004134200Z_20121004141500Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005003900Z_20121005011200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005021800Z_20121005025400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121005132100Z_20121005135400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006015700Z_20121006023300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121006130000Z_20121006133300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007013900Z_20121007021200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007123900Z_20121007131200Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121007141800Z_20121007145400Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008011800Z_20121008015100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121008135700Z_20121008143300Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009005700Z_20121009013000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121009133900Z_20121009140900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010003600Z_20121010010900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010021500Z_20121010025100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121010131500Z_20121010135100Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121011015400Z_20121011023000Z_N_C_xxxxxxxxxxxxxxZ
(2) For the robustness test using 5 additional days of data ASCA_xxx_00_M01_20121011125700Z_20121011133000Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012013600Z_20121012020900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012123600Z_20121012130900Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121012141500Z_20121012144800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013011500Z_20121013014800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121013135400Z_20121013142700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014005400Z_20121014012700Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014023300Z_20121014030600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121014133600Z_20121014140600Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015021200Z_20121015024800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121015131200Z_20121015134800Z_N_C_xxxxxxxxxxxxxxZ ASCA_xxx_00_M01_20121016015100Z_20121016022700Z_N_C_xxxxxxxxxxxxxxZ
Page 65 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX H GOUND SEGMENT CONFIGURATION CHANGES
All the PPF tuning and validation has been done on GS2 GS3 has been kept aligned but not used not monitored
The following is a list of updates of the ASCAT Level 1 and NTG PPFs in G23 since launch
2409 ASCA_NTB_xx_M01 v10
EPS_SWET_647 To allow ASCAT L1 cold start for SIOV orbit (pre-manoeuvre)
2509 ASCA_PRC_xx_M01 v11
EPS_SWET_651 To bring ASCAT-B PGP to approximate 1
0210 ASCA_PRC_xx_M01 v12
EPS_SWET_658 PGP cCal locking and fComOp and fCal to zero in order to allow soil moisture ASCAT-B PPF to start processing
1710 ASCA_XCL_M01 v12
EPS_SWET_665 Preliminary ASCAT AB cross-calibration over the rainforest
Page 66 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX I ASCAT TRANSPONDER POINT TARGET RADAR BACKSCATTERING CROSS-SECTIONS
The ASCAT transponder cross-sections are known for six possible configurations T1 Baseline Configuration T2 Baseline Configuration T3 Baseline Configuration T1 with Spare WEE Configuration T2 with Spare WEE Configuration T3 with Spare WEE Configuration
The cross-sections for other possible configurations are not known and these configurations can therefore not be used for ASCAT transponder calibration
If the single spare WEE is used at any site the transponder cross-sections used in the ASCAT Ground Processing have to be changed to reflect this otherwise ASCAT Calibration Mode data will be wrongly processed The cross-sections used in the ground processing must reflect the deployed configuration
BASELINE CONFIGURATION
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP3 Transponder Cross Section = 98219 dB metres squared (at 5255 GHz) Transponder Cross Section = 66359025550 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP2 Transponder Cross Section = 98148 dB metres squared (at 5255 GHz) Transponder Cross Section = 65282984420 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) WEE Serial Number QinetiqASCAT-GTRFU-OP1 Transponder Cross Section = 98268 dB metres squared (at 5255 GHz) Transponder Cross Section = 67111971970 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 Central Site taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 under the assumption that re-calibration indicates that the cross section was not changed by vibrations and shocks experienced (2) Cross Section for T2 Western Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 Eastern Site taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 67 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
CONFIGURATIONS USING SPARE WEE OS1
T1 Central Site (a) Potter Horn MAAS Serial Number 00101 (b) Waveguide Serial Number Production 3 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98133 dB metres squared (at 5255 GHz) Transponder Cross Section = 65057893920 metres squared (at 5255 GHz)
T2 Western Site (a) Potter Horn MAAS Serial Number 00106 (b) Waveguide Serial Number Production 2 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98323 dB metres squared (at 5255 GHz) Transponder Cross Section = 67967297190 metres squared (at 5255 GHz)
T3 Eastern Site (a) Potter Horn MAAS Serial Number 00100 (b) Waveguide Serial Number Production 1 (c) Spare WEE Serial Number QinetiqASCAT-GTRFU-OS1 Transponder Cross Section = 98138 dB metres squared (at 5255 GHz) Transponder Cross Section = 65132837720 metres squared (at 5255 GHz)
Notes (1) Cross Section for T1 with Spare WEE taken from ASCAT Ground Transponder - 1st Production Unit System Test Report QINETIQKISPACETN04114011 February 2005 (2) Cross Section for T2 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007 (3) Cross Section for T3 with Spare WEE taken from ASCAT Ground Transponder Calibration and Functional Test (2006-07) Report QINETIQSampDUSPACETSTR0602935 May 2007
Page 68 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
APPENDIX J SANITY CHECK ON THE CALIBRATION TUNING ON 1810
DPS reports (2410) on normalization factors change wrt a reference NTB
Page 69 of 70
EUMOPSDOC123436 v2 20 December 2012
ASCAT-B Level 1 Calibration and Validation Report
Several rainforest gamma0 patterns (one pass each) before the calibration tuning (red) and after (green) in comparison with those over 1 month of ASCAT-A (black)
Page 70 of 70
