armasuisseSwiss Federal Office of Topography swisstopo

swisstopo Report for EGVAP 2007/2008

E. Brockmann

2 Swiss Federal Office of Topography swisstopo

swisstopo Report 2008 for EGVAP

Content

• GPS -> GPS/GLONASS in Switzerland• Activities in E-GVAP• Super site selection• EUMETNET / EUREF Memorandum of Understanding

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swisstopo Report 2008 for EGVAP

Satellite Constellation

32 GPS-satellites 16 GLONASS-satellites

Status end of April 2008

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swisstopo Report 2008 for EGVAP

GNSS orbits (from CODE)

including “unhealthy” satellites

triple launch GLONASS

October 2007: only 9 of 17 satellites operational

+ GPS “29”

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swisstopo Report 2008 for EGVAP

10 double stations

ARDEBOURDAVOETHZFRICHOHTMARTSAANSTABZIMM

• Double stations as compromise between real-time applications (higher availability of the positioning service swipos under difficult environment) and the aspects of reference frame maintenance (continuity of time series)

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swisstopo Report 2008 for EGVAP

Tracking: ZIMM (GPS) – ZIM2 (GNSS)

∅ 10 GPS ∅ 14 GNSS

12 channels max.

ZIMMZIM2

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swisstopo Report 2008 for EGVAP

Activities AGNES-II 2007

• March-June: antenna calibration with a robot (company Geo++)

34 individuel antennas + IGS values ( )

Elev.-dependent antenna phase center variations GPS (individuel) + GLONASS (group)

[mm] no “outlier antenna”

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swisstopo Report 2008 for EGVAP

Activities AGNES-II 2007(2)

• Nov. 06 –Sept. 07: GNSS-analyses changes BSW 5.0++- CODE GNSS orbits- Baseline optimization- Preprocessing bugs eliminated for GNSS

• 14. June (PAYE) – 2. July (GENE): 20 stations upgraded• 10.9.:Ambiguity-float GNSS results presented already in

Matera• Oct. 07: ambiguity resolution for hourly processing

Baseline length strategy Fixed Ambiguities

0 - 20 km L1/L2 95 - 100%

20 - 200 km L5/L3 90 - 100%

200 - 2000 km QIF *) 70 – 80%

*) QIF: only ambiguites with identical frequencies; no amb. GPS - GLONASS DOY 350 (16. December) 2007

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swisstopo Report 2008 for EGVAP

Activities AGNES-II 2007(3)

• Aug. – today: double station setup (4 sites still missing)• 18. Dec.: new site coordinates and new web system (CMS)

station Luzern (antenna change: July 11, 2007)

2 mm

25 mm

0 mm

10 Swiss Federal Office of Topography swisstopo

swisstopo Report 2008 for EGVAP

Activities AGNES-II 2008

• LPTR real-time contribution: only GNSS stations

• 15.4.08: LPT analysis on a new computer (no model changes)

Processing start

Delivering to EGVAP

xx:60’

xx:30’xx:15

’

3 times faster processing

30 minutes earlier!

~ 80 GNSS sites

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swisstopo Report 2008 for EGVAP

Activities AGNES-II 2008(2)

• Delivering statistics E-GVAP

before April 15 after April 15

ztd “peaks” at xx:00 and x:59

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swisstopo Report 2008 for EGVAP

GNSS validation: ZIM2Reference: PP, GNSS, absolute antenna PCV

GLONASS influence is small for daily PP amb-fix solutions

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swisstopo Report 2008 for EGVAP

Super sites

Small coordinaterepeatability problems

see also EPN web page

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swisstopo Report 2008 for EGVAP

EUMETNET – EUREF - MOU

• signed in London, June 2007: Data exchange and usage of radiosonde and synop (meteo) for geodetic scientific use

• Radiosonde data made available on DMI data server since beginning April 2008

• “condition of use” form must be signed -> H. Vedel

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swisstopo Report 2008 for EGVAP

EUMETNET Radiosonde Data / swisstopo GNSS data• 11 collected radiosonde sites with GNSS sites processed by

swisstopo

GNSS site

RS site

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swisstopo Report 2008 for EGVAP

Comparisons (ZIMM, PAYE)

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swisstopo Report 2008 for EGVAP

EUMETNET Radiosonde Data / GNSS data• Paper of first tests at EUREF symposium in Brussels, June

2008: E. Pottiaux, W. Söhne, E. Brockmann

• In future: met data, eventually NWP (not part of MoU)

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swisstopo Report 2008 for EGVAP