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Sub-centimeter SLR precision with the SLRF2005/LPOD2005 network

Sub-centimeter SLR precision with the SLRF2005/LPOD2005 network. N.P. Zelensky, F.G. Lemoine, D.D. Rowlands, S.B. Luthcke, D.S. Chinn, J.W. Beall, B.D. Beckley, S.M. Klosko , P. Willis, V. Luceri. 16th International Workshop on Laser Ranging Poznan, Poland October 13-17, 2008.

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Sub-centimeter SLR precision with the SLRF2005/LPOD2005 network

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  1. Sub-centimeter SLR precision with the SLRF2005/LPOD2005 network N.P. Zelensky, F.G. Lemoine, D.D. Rowlands, S.B. Luthcke, D.S. Chinn, J.W. Beall, B.D. Beckley, S.M. Klosko, P. Willis, V. Luceri 16th International Workshop on Laser Ranging Poznan, Poland October 13-17, 2008

  2. SLR processing at GSFC

  3. Consistent POD models across satellites Models include:

  4. Inter-comparison span

  5. Jason1 station performance; cycles 1-237; 24 primary stations * LPOD2005

  6. Station position/bias mis-modeling affects Jason1 orbit

  7. Jason1 Zimmerwald (blue) mean SLR residuals

  8. Example slrf2005-only Jason1 orbit corrupts Matera (7941) evaluation

  9. Jason1 Riyadh mean SLR residuals

  10. Jason1 Ajacio mean SLR residuals

  11. Yarragadee mean SLR residuals

  12. Wettzell mean SLR residuals

  13. Herstmonceux mean SLR residuals

  14. Conclusions • SLR processing now at the 1-cm level for Jason and Lageos, and 1.5-cm for Topex • At this level differentiating between station biases and position /velocity error is difficult, but critical for further improvement. • LPOD2005 significantly improves primary stations Zimmerwald, Riyadh, and Ajacio. • Herstmonceux shows a 1.2 cm bias beginning about Feb 12, 2007. Wettzell shows 1-cm level mean residuals and a possible trend. • Such analysis applied to all the primary stations will be presented at the upcoming OSTST November 2008 meeting.

  15. BACKUP

  16. SLR processing at GSFC

  17. Jason1 radial 5-mm annual amplitude due to time varying gravity

  18. Jason1 station performance; cycles 1-237; all 57 stations ** adjust bias per pass; * adjust bias per arc

  19. Mean SLR residuals correspond to range bias

  20. Goddard SLRF2005 mean residuals

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