Determination of the SLR station coordinates and velocities on the basis of laser observations of low satellites Paweł Lejba, Stanisław Schillak Space.

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Presentation transcript:

Determination of the SLR station coordinates and velocities on the basis of laser observations of low satellites Paweł Lejba, Stanisław Schillak Space Research Centre, Polish Academy of Sciences, Astrogeodynamical Observatory Borowiec 16 th International Workshop on Laser Ranging Poznań, Poland, October 2008 "SLR - the next generation"

Satellites Parameters AJISAI STARLETTE STELLA

 Earth gravity field: EIGEN-GRACE02S 45x45 (Ajisai) 65x65 (Starlette/Stella)  Earth and ocean tide model: EGM96  Polar motion: IERS C04  Arc length: 14 days for Ajisai, 10 days for Starlette/Stella  Stations coordinates and stations velocities: ITRF2005  Tropospheric refraction: Marini/Murray model. Program GEODYN II Main models and parameters:  satellite state vector  station geocentric coordinates transformated to station topocentric coordinates (Borkowski procedure)  acceleration parameters along-track, cross-track and radial at 6 and 12 hours intervals

ACCEL Test AJISAI STARLETTE STELLA

Gravity Test AJISAI STARLETTE STELLA

Orbit Determination  data from the 14 SLR stations collected in the period from January 1, 2001 to December 25, 2005

The positions and velocities of four SLR stations were determined: Graz (7839)Greenbelt (7105)Herstmonceux (7840)Yarragadee (7090)

Station Stabilities and Velocities V2D - ACCEL 6H SOLUTION V2D - ACCEL 12H SOLUTION STATION TOTAL STABILITY

 the RMS on the level cm for Ajisai and cm for Sta/Ste  the total stability of the station coordinates on the level mm for Ajisai and mm for Sta/Ste  the station velocities (V2D) are in good agreement with ITRF2005 and geological model NNR-NUVEL1A  the problem of LEO is too less observations  the lack of SLR station on the Southern Hemisphere  the new gravity field model (GOCE mission)  "SLR - the next generation" - the future may belong to LEO Summary and Conclusions

Acknowledgements  the author wishes to thank the NASA geodesy group for consent to use of GEODYN-II orbital program,  and to thank all ILRS stations and data centers for their continuous efforts to provide high-quality global SLR data for this work.

Thank you for your attention and nice stay in Poznan !