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Practical Exchange of ATOVS Direct Broadcast Data
in Asia Pacific Region
Akihiko Nakazono
Office of International Communications,
Forecast Department, JMA
APSDEU-6, 1-3 June 2005, Seoul, Republic of Korea
© NOAA/NESDIS
PART 1PART 1
Status of ATOVS-DB Data Related Status of ATOVS-DB Data Related Activities in JMAActivities in JMA
Topic-1ATOVS-DB Data at Syowa StationATOVS-DB Data at Syowa Station
• Syowa Station, belongs to the National Institute of Polar Research (NIPR) , was established in 1957 at 69.00S and 39.58E Antarctica.
• Showa Station has been receiving NOAA HRPT data for research and operation.
• The HRPT data are relayed to the NIPR in Tokyo near real-time through 1Mbps satellite communication circuits since 2004.
ATOVS-DB Data at Syowa StationATOVS-DB Data at Syowa Station(cont.)
• JMA started to negotiate with the NIPR on acquisition and utilization of the data, including dissemination to WMO Members.
• The NIPR seems to allow dissemination to WMO members under the their data policy, i.e., inclusion of the originator name in the data.
• The Meteorological Satellite Centre is experimentally getting the data from the NIPR, and studying for applying the AAPP package effectively.
Sample ATOVS Data Received at Sample ATOVS Data Received at Syowa StationSyowa Station
Topic-2
Replacement Plan of HRPT EquipReplacement Plan of HRPT Equipment at the Meteorological Satellitment at the Meteorological Satellit
e Centre (MSC), Kiyosee Centre (MSC), Kiyose
Reception of NOAA DB DataReception of NOAA DB Dataat MSC (current system)at MSC (current system)
• JMA has been receiving the NOAA satellite data since 1968 at the MSC, Kiyose
• Currently, JMA receives HRPT data from NOAA-16 and 17 around 10 orbits a day
(c)Nojima
NNew Reception Systemew Reception System
• The MSC is procuring a new POS receiving system which replaces current one.
• Capability of direct reception of the forthcoming AHRPT from METOP as well as HRPT from NOAA satellites
• In addition to the L-band, antenna has a capability of receiving X-band for the reception of HRD from NPP/NPOESS
• New system start to work in March 2006
Diagram of new reception system
INTFINTF
DRIVERCIRCUIT
DRIVERCIRCUIT
LAN
3mΦParabolicantenna Time
Server
TimeServer
NOAARx
NOAARx
METOPRx
METOPRx
INTFINTFSignal Processing
& Control Unit
Optical Cable
SAPS
HRPT, AHRPT
Antenna Tower Operation Room
SAPS:Satellite Data
Advanced Processing
System
LNALNA
D/CD/C
Future plan of polar orbit satellite data receptionFuture plan of polar orbit satellite data reception
METOP-2
METOP-1
NOAA-N’
NOAA-18
NOAA-17
NOAA-16
201320122011201020092008200720062005
: PM Satellite : AM Satellite
As of May 2005
Status of AAPP InstallationStatus of AAPP Installation
• JMA has already utilized the AAPP ver.4.4 operationally for ATOVS DB data at MSC/JMA and for global ATOVS data at NPD/JMA.
• The AAPP processing time for DB HRPT data is less than two minutes per orbit.
PART 2PART 2
Practical Exchange of ATOVS-DB Practical Exchange of ATOVS-DB Data in Asia PacificData in Asia Pacific
CONTENTS CONTENTS
• BackgroundBackground• Analysis & Estimation for exchangeAnalysis & Estimation for exchange• ProposalProposal
BackgroundBackground
• The importance of ATOVS DB data for NWPs has been confirmed and therefore the exchange of ATOVS DB data have been discussed in the APSDEU since its fourth meeting in March 2002.
• APSDEU-4: Recommendation 8– The meeting noted the importance of real time data exchange
of locally received ATOVS data. – KMA and CMA agreed to explore the possibility of real time AT
OVS data exchange.– BoM will investigate the possibility of distributing locally receiv
ed ATOVS data.
BackgroundBackground(cont.)
• Action Item 2004-5-15 ( Beijing,2004)– The meeting noted the importance of real time data exchange
of locally received ATOVS L1B or L1C data processed by AAPP.
– KMA, CMA and JMA agreed to investigate the possibility of real time ATOVS data exchange.
– The Australian Bureau of Meteorology also agreed to investigate the possibility of distributing real time ATOVS data.
– These countries agreed to explore the EUMETSAT EARS approach as one possible strategy to achieve implementation.
BackgroundBackground (cont.)
• EARS has been established for collecting and disseminating ATOVS data in Europe and North America since 2001
• CGMS has been discussing the exchange of ATOVS DB Data within the framework of WMO Space Program
• WMO , hosted by EUMETSAT, held the 1-st RARS Workshop in Dec 2004
In the 1-st RARS Workshop,In the 1-st RARS Workshop,• Three Areas are Focused and Discussed for RARS in the Asi
a Pacific Region– Data Collection
• Potential HRPT Stations - at least, 19 stations are identified• Communication means - FTP over GTS, Internet ….
– Data Distribution• Communication means - FTP over GTS, Internet ,...
– Standardization• The data should only be processed to AAPP L1A at the various
HRPT station sites• Further processing to AAPP L1C at the distribution centres to en
sure better calibration on the data
Potential HRPT Stations in the Asia PacificPotential HRPT Stations in the Asia Pacific
• Existing National Stations: in Australia, China - including Hong Kong, Japan, Korea, and New Zealand
• Singapore, Guam, Tahiti, Fiji, (La Reunion) • Antarctic Stations:
– McMurdo, Dumont d’Urville , Casey, Syowa
Coverage by the 19 stations above
CONTENTS CONTENTS
• BackgroundBackground• Analysis & Estimation for exchangeAnalysis & Estimation for exchange• ConclusionConclusion
HRPT Stations in BoM, CMA, HKO, HRPT Stations in BoM, CMA, HKO, KMA, and JMAKMA, and JMA
• BoM– Darwin, Melbourne, Perth, Casey (Antarctica)
• CMA– Beijing, Guangzhou , Urumuqi, Lasha
• HKO– Hong Kong
• KMA– Seoul
• JMA– Kiyose, Syowa (Antarctica)
There are 12 candidates
Coverage by 12 HRPT Stations
Coverage by the 12 HRPT Stations (Northern Hemisphere)
EARS (DEC 2003)
Coverage by the 12 HRPT Stations (Southern Hemisphere)
Duration and Completion of reception
A coverage of the station (depends on conditions)
Orbit NOrbit N+1Orbit N+2
Completion
Completion
Duration
A Receiving Station
0:00
2:00
4:00
6:00
8:00
10:0
0
12:0
0
14:0
0
16:0
0
18:0
0
20:0
0
22:0
0
0:00
Completion Time (UTC)
1st May
2nd May
3rd May
Darwin
Melbourne
Perth
Casey
Kiyose
Syowa
Seoul
Beijing
Guangzhou
Urumuqi
Lasha
Hong Kong
Station
Estimated Duration and Completion Time at Estimated Duration and Completion Time at HRPT Receiving Stations HRPT Receiving Stations (NOAA-16, 1(NOAA-16, 1stst-3-3rdrd May) May)
Origin of each circle indicates completion time.
Diameter of each circle is relative to the duration of reception (max. 15-minutes)
Estimated Completion Time of HRPT Estimated Completion Time of HRPT Receiving Stations (superposition in May)Receiving Stations (superposition in May)
0:00
2:00
4:00
6:00
8:00
10:0
0
12:0
0
14:0
0
16:0
0
18:0
0
20:0
0
22:0
0
0:00
Completion Time (UTC)
NOAA-16,Superpositionin May
NOAA-17,Superpositionin May
DarwinMelbourn
PerthCaseyKiyoseSyowaSeoul
BeijingGuangzhUrumuqi
LashaHong
Statio
0:00
2:00
4:00
6:00
8:00
10:0
0
12:0
0
14:0
0
16:0
0
18:0
0
20:0
0
22:0
0
0:00
Completion Time (UTC)
NOAA- 16,Superposition
NOAA- 17,Superposition
NOAA- 16,1st May
NOAA- 17,1st May
Darwin
Melbourne
Perth
Casey
Kiyose
Syowa
Seoul
Beijing
Guangzhou
Urumuqi
Lasha
Hong Kong
Station
Estimated Duration and Completion Time at Estimated Duration and Completion Time at HRPT Receiving Stations (1HRPT Receiving Stations (1stst May) May)
1 2 3 4 Congestion Times
2:00
3:00
4:00
5:00
Completion Time (UTC)
NOAA- 16,1st May
NOAA- 17,1st May
Darwin
Melbourne
Perth
Casey
Kiyose
Syowa
Seoul
Beijing
Guangzhou
Urumuqi
Lasha
Hong Kong
Station
Estimated Duration and Completion Time at Estimated Duration and Completion Time at HRPT Receiving Stations (congestion time1)HRPT Receiving Stations (congestion time1)
5:00
6:00
7:00
8:00
Completion Time (UTC)
NOAA- 16,1st May
NOAA- 17,1st May
Darwin
Melbourne
Perth
Casey
Kiyose
Syowa
Seoul
Beijing
Guangzhou
Urumuqi
Lasha
Hong Kong
Station
Estimated Duration and Completion Time at Estimated Duration and Completion Time at HRPT Receiving Stations (congestion time2)HRPT Receiving Stations (congestion time2)
13:0
0
14:0
0
15:0
0
16:0
0
Completion Time (UTC)
NOAA- 16,1st May
NOAA- 17,1st May
Darwin
Melbourne
Perth
Casey
Kiyose
Syowa
Seoul
Beijing
Guangzhou
Urumuqi
Lasha
Hong Kong
Station
Estimated Duration and Completion Time at Estimated Duration and Completion Time at HRPT Receiving Stations (congestion time3)HRPT Receiving Stations (congestion time3)
18:0
0
19:0
0
20:0
0
21:0
0
Completion Time (UTC)
NOAA- 16,1st May
NOAA- 17,1st May
Darwin
Melbourne
Perth
Casey
Kiyose
Syowa
Seoul
Beijing
Guangzhou
Urumuqi
Lasha
Hong Kong
Station
Estimated Duration and Completion Time at Estimated Duration and Completion Time at HRPT Receiving Stations (congestion time4)HRPT Receiving Stations (congestion time4)
Characteristics of ATOVS DB reception in view of exchange
• Rush hour of ATOVS data are foreseen around six to eight times a day in the East Asia
• In a rush hour, most of HRPT stations in CMA, HKO, KMA and JMA complete reception in a short period (within 10 minutes )
• In view of traffic, the degree of rushing depends on orbit position, data processing time at stations and centers, and national and international communications…should be examined
Amount of ATOVS Data Unit to be Transferred
• AAPP Level 1A/1B– Maximum Size = 1.2MB / Pass / Satellite in gzip compressed
file• AAPP Level 1C
– Typical Size = 1.1MB / Pass / Satellite in BUFR form• Roughly, 1.2MB is a index of data transfer• A 1.2MB file is transferable within 5 minutes
through a 32Kbps circuit with 100% efficiency
BoMMelbourne
BoMMelbourne
HKOHong Kong
HKOHong Kong
KMASeoul
KMASeoul
JMATokyo
JMATokyo
F/R
F/R
F/R
MSS TokyoMSS Tokyo
NOAA
ATOVS
256Kbps 1.5Mbps
64Kbps
192Kbps
64Kbps
128Kbps 128Kbps
CMABeijing
CMABeijing
CIR=16 CIR=32
CIR=48 CIR=48
CIR=16
CIR=16
CIR=16 UNIX Workstation4 processors
CIR=16
FTP File exchange
GTS Socket Message, FAX exchange
F/R : Frame Relay CIR : Committed Information Rate
( RMDCN)
GTS links for exchange of ATOVS dataGTS links for exchange of ATOVS data FTP can be used for ATOVS data exchange over GTS among these centres
MSS TokyoMSS Tokyo
FTP File exchange
GTS Socket Message, FAX exchange
F/R : Frame Relay CIR : Committed Information Rate
Use of GTS links for exchange of ATOVS Use of GTS links for exchange of ATOVS datadata
FTP can be used for ATOVS data exchange over GTS among these centers In the Rush Hour
BoMMelbourne
BoMMelbourne
HKOHong Kong
HKOHong Kong
KMASeoul
KMASeoul
JMATokyo
JMATokyo
F/R
F/R
F/R
NOAA
ATOVS
256Kbps 1.5Mbps
64Kbps
192Kbps
64Kbps
128Kbps 128Kbps
CMABeijing
CMABeijing
CIR=16 CIR=32
CIR=48 CIR=48
CIR=16
CIR=16
CIR=16 UNIX Workstation4 processors
CIR=16
( RMDCN)64Kbps
96Kbps
96Kbps
96Kbps
Rough Estimation To complete file transfer
around 5 minutes
• These five centers are connected by TCP/IP links in GTS directly or via Tokyo
• FTP can be used for ATOVS data exchange over GTS among these centers
• FTP server at Tokyo is accessible through GTS and has capability to collect and distribute ATOVS data files
• Most of GTS links among these centers seem to have, or will have, enough spare capacity for ATOVS data, but some circuits have to be considered to widen the bandwidth to avoid delay in congestion hours
Use of GTS links for the exchange of ATOVS data among BoM, CMA, HKO,
KMA and JMA
Standardization/Coordination( for data handling and utilizing )
• Type of data to be exchanged– AAPP Level L1A/L1B/L1C– AAPP Version?
• Names and Codes– Name (Code) of the HRPT Stations and Processing Centre
s required in the AAPP and applied to output data, should be coordinated globally
• Format of data– AAPP Specific file, or– BUFR form(L3C) (TBD)
• Descriptors and codes to be used(Is it enough with 3-10-008, 3-10-009, 3-10-010 for L1C?)
• Any additional descriptors and/or codes to be defined?– Common encoder is expected for BUFR encoding
To Exchange ATOVS Data, some rules are required and shall to be coordinated
Standardization/Coordination( for data transfer )
• Data compression– gzip, bzip2 ?
• File naming convention for transfer– For WMO code: WMO PUB 386, AII-15– For other type: TBD (WMO has not defined yet)
• FTP procedure – WMO PUB 386, AII-15– Get/Put? (needs bilateral agreement between centres)
• Anything else ?
CONTENTS CONTENTS
• BackgroundBackground• Analysis & Estimation for exchangeAnalysis & Estimation for exchange• ConclusionConclusion
The Time Has Come
• JMA already has capability of receiving HRPT, pre-processing by AAPP, and exchanging ATOVS data through the GTS, and is willing to perform our part of the retransmission functions through the GTS in cooperation with other Centers concerned
• JMA propose: – to start to exchange ATOVS AAPP data– among BoM, CMA, HKO, KMA , and JMA– through the GTS– by the end of 2005
The Time Has Come (Cont.)
• APSDEU is expected to start discussion and coordination on the exchange of ATOV DB data
• Then, examine the exchange and make reviews to the next step=> The next meeting is expected to be held in early 2006
Thank you for your attention!!Thank you for your attention!!
감사합니다감사합니다
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