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Precise Orbit Determination of the GIOVE Satellites

Precise Orbit Determination of the GIOVE Satellites. Peter Steigenberger, Urs Hugentobler Technische Universität München. Oliver Montenbruck, André Hauschild , Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen. Introduction. G alileo I n O rbit V alidation E lement.

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Precise Orbit Determination of the GIOVE Satellites

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  1. Precise Orbit Determination of the GIOVE Satellites Peter Steigenberger, Urs Hugentobler Technische Universität München Oliver Montenbruck,André Hauschild, Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen

  2. Introduction Galileo In Orbit Validation Element Test satellites for the future European GNSS Galileo GIOVE-A, launch: 28 Dec. 2005 • Outline • Orbit modeling • GIOVE POD at TUM • Precision and accuracy of orbits • Impact of clock modeling on orbits GIOVE-B, launch: 27 Apr. 2008

  3. COoperative Network for GIOVE Observation CONGO GNSS SLR

  4. GIOVE Orbit Modeling • 1-day orbit arcs unstable due to small number of tracking stations • Long-arc solutions: 3 to 9 days • Estimation of 5 or 9 radiation pressure parameters GIOVE-B orbit fits 1-day arcs GIOVE-B orbit fits 5-day arcs 2009 2010 2009 2010

  5. Orbit Differences Middle Day/Last Day Mean/STD/RMS [m] Orbit arc length Number of RPR parameters: 5 RPR 9 RPR

  6. CODE orbits and clocks GPS-only PPP Ntrip Decoder Coordi- nates Tropo- sphere Receiver clocks 24 h files RINEX 3.00 Operational Rapid Processing (1) Modified Bernese GPS Software 5.0 Ionosphere-free linear combination of L1/L2 (GPS) and E1/E5a (GIOVE)

  7. NEQ - 4 NEQ - 3 NEQ - 2 NEQ - 1 NEQ Orbits Clocks 5 day long-arc solution + 2 day prediction Operational CONGO Processing (2) Operational Rapid Processing (2) Coordi- nates Tropo- sphere Receiver clocks 24 h files RINEX 3.00 GIOVE orbit and clock determination

  8. Coordi- nates Tropo- sphere Receiver clocks 24 h files RINEX 3.00 Final orbit fixed GIOVE final clock determination Operational Final Processing NEQ - 2 NEQ - 1 NEQ NEQ + 1 NEQ + 2 Middle day of 5 day long-arc solution

  9. Internal Consistency: RMS of 2-day orbit fits GIOVE-A Middle days of 5-day arcs GIOVE-B

  10. SLR Orbit Residuals GIOVE-A 2009 2010 Residuals [cm] GIOVE-B 2009 2010 Residuals [cm]

  11. Orbit Predictions Differences of predicted GIOVE orbits w.r.t. last observed day GIOVE-A GIOVE-B Position Difference [m] Position Difference [m]

  12. Orbit Predictions Differences of predicted GIOVE orbits w.r.t. last observed day GIOVE-A GIOVE-B Position Difference [m] Position Difference [m]

  13. GIOVE-B Hydrogen Maser GIOVE-AGIOVE-B

  14. 0.5 ns 14 h GIOVE-B Clock Estimates Quadratic term and jumps removed Clock correction [ns] Time [h]

  15. GIOVE-B Clock Estimation Quadratic term, jumps und 1-per-rev removed Clock correction [ns] Time [h]

  16. GIOVE-B Clock Estimation Quadratic term, jumps und 1-per-rev removed Kouba, 2004 Clock correction [ns] Time [h]

  17. GIOVE-B Clock Modeling • Estimated clock parameters: • offset and drift of a linear clock model for entire day • relativistic J2-correction modeled • epoch-wise clock corrections, constrained

  18. GIOVE-B Clock Modeling Clock corrections for different clock constraints 3 ps 30 ps 300 ps Clock correction [ns] Time [h]

  19. GIOVE-B Clock Modeling: Residuals Phase residuals for different clock constraints 3 ps 30 ps 300 ps Residuals [m] Time [h]

  20. GIOVE-B Clock Modeling: Orbit Differences Differences with and without clock modeling 3 ps 30 ps 300 ps Radial orbit differences [m] Time [h]

  21. GIOVE-B Clock Modeling: Orbit Quality Improvement ratio orbit fits with and without clock modeling Radial improvement ratio Improvement Day of year 2009

  22. GIOVE-A Maneuver 23 June 2010 Interrupted transmission during maneuver, clock synchronization 24 June 23 June Javad GeNeRx Leica Time [h] Time [h]

  23. Summary and Conclusions • The CONGO network allows for GIOVE orbit determination with decimeter accuracy and meter level predictions • Orbit accuracy is limited by the small number of stations • Clock modeling can improve the orbit quality • RINEX 3.00 is mandatory for processing GIOVE/Galileo data • Installation of Galileo-capable antennas and receivers next to IGS stations before launch of the IOV satellites desirable • Parallel operation for reasonable time span (reference frame stability) • Satellite antenna offsets and phase center variations for different ionosphere-free linear combinations (E1/E5a, E1/E5b, E1/E5, E1/E6)

  24. Estimated Radiation Pressure Parameters

  25. GIOVE-B Clock Modeling: Orbit Quality

  26. Orbit Predictions Differences of predicted GIOVE orbits w.r.t. last observed day GIOVE-A GIOVE-B

  27. Orbit Predictions Differences of predicted GIOVE orbits w.r.t. last observed day GIOVE-A GIOVE-B

  28. GIOVE-B Hydrogen Maser GIOVE-AGIOVE-B

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