1 / 28

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.

rudolph
Download Presentation

Precise Orbit Determination of the GIOVE Satellites

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related