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This study examines SLR residuals, known problems, and results for GNSS orbits' validation. It discusses spectral analysis, codes for orbits, and concludes with orbit modeling issues and pattern observations.

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  1. Validation of GNSS Satellite OrbitsC. Flohrer, G. Beutler, R. Dach, W. Gurtner, U. Hugentobler1, S. Schaer, T. Springer2Astronomical InstituteUniversity of Bern1Institut for Astronomical and Physical GeodesyTechnische Universität München2ESA/European Space Operations CenterDarmstadtIGS Workshop, Miami BeachJune 2, 2008

  2. Inhalt • Introduction • SLR residuals • Orbit overlaps • 14-day peak

  3. 350·1/6 days 1/year 2/year 3/year 4/year 6/year Known Problems • Spectra of coordinate time series of IGS stationen • draconitic GPS year, most probably due to orbit modeling deficiencies Ray, 2006

  4. Known Problems

  5. Known Problems

  6. Known Problems

  7. –3.5 cm –3.8 cm SLR Validation of GNSS Orbits σ 2.2 cm G05 σ 2.7 cm G06

  8. SLR Validation of GNSS Orbits GLONASS 03 GLONASS 22 GLONASS 24

  9. SLR Validation of GNSS Orbits • Results for CODE GNSS orbits

  10. 0 D SLR Validation of GNSS Orbits

  11. SLR Validation of GNSS Orbits • Residuals for CODE orbits of G05 and G06, ROCK a priori model

  12. SLR Validation of GNSS Orbits • Residuals for CODE orbits of G05 and G06, CODE a priori model

  13. SLR Validation of GNSS Orbits • Residuals for CODE GLONASS orbits

  14. SLR Validation of GNSS Orbits • Residuals for GFZ GPS orbits

  15. SLR Validation of GNSS Orbits • Residuals for IGS GPS orbits

  16. SLR Validation of GNSS Orbits Plane 1 BLOCK II 2 3 4 5 BLOCK IIR 6

  17. Orbit Overlaps, 1-Day CODE Orbits G28 radial alongtrack crosstrack

  18. 40 cm Orbit Overlaps, 1-Day CODE Orbits Plane 2 βmax = 78° Plane 3 βmax = 76° Plane 1 βmax = 70°

  19. Orbit Overlaps, 1-Day CODE Orbits Plane 4 βmax = 61° Plane 6 βmax = 51° Plane 5 βmax = 40°

  20. Orbit Overlaps , 1-Day CODE Orbits Plane 2 βmax = 78° Plane 3 βmax = 76° Plane 1 βmax = 70°

  21. Orbit Overlaps , 1-Day CODE Orbits Plane 4 βmax = 61° Plane 6 βmax = 51° Plane 5 βmax = 40°

  22. Orbit Overlaps, Amplitude Spectra

  23. Mean Power Spectrum, 14-Day Line

  24. Mean Power Spectrum, 14-Day Line

  25. Mean Power Spectrum, 14-Day Line

  26. Mean Power Spectrum, 14-Day Line

  27. Mean Power Spectrum, 14-Day Line

  28. Mean Power Spectrum, 14-Day Line

  29. Mean Power Spectrum, 14-Day Line

  30. Mean Power Spectrum, 14-Day Line

  31. Mean Power Spectrum, 14-Day Line

  32. Mean Power Spectrum, 14-Day Line

  33. Phase Spectrum, Plane-specific

  34. Phase Spectrum, Plane-specific

  35. Phase Spectrum, Plane-specific

  36. Phase Spectrum, Plane-specific

  37. Phase Spectrum, Plane-specific

  38. Phase Spectrum, Plane-specific

  39. Phase Spectrum, Mean for Planes

  40. Power Spectra of Helmert Parameters

  41. Power Spectra of Helmert Parameters

  42. Power Spectra of Helmert Parameters

  43. Power Spectra of Helmert Parameters

  44. Power Spectra of Helmert Parameters

  45. Power Spectra of Helmert Parameters

  46. CODE 1d Solution, 24h Pole Estimate

  47. CODE 1d Solution, 2h Pole Estimate

  48. Conclusions • Orbit modeling problems affect the entire solution • Orbit periods are found in station positions and geocenter motion • SLR Residuals show a characteristic pattern • Patterns in orbit overlap time series seem not to be influenced by the a priori orbit model • Patterns depend on the maximum elevation of the Sun above the orbital plane which indicates problems with the estimated empirical orbit parameters • Prominent peak at 14-days • In alongtrack and crosstrack directions • In phase for all satellites • Period seems to be related to tidal corrections in the system orientation • Probably due to the used subdaily pole model

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