![]() ![]() “GEODYN II System Description,” Hughes STX Contractor Report, Greenbelt, Maryland, December 1993. C., MOORE, D., PAVLIS, D.E., LUTHCKE, S.B., and TSAOUSSI, L.S. “Mission Evaluation Workstation System (MEWS) User Guide,” Flight Engineering Office, Johnson Space Center, Houston, Texas, July 1994. Methods of Satellite Oceanography, University of California Press, Berkeley and Los Angeles, California, 1985, pp. “The Shuttle Laser Altimeter (SLA-01) Experiment,” EOS Transactions of the American Geophysical Union, Vol. ![]() GARVIN, J.B., BLAIR, J.B., BUFTON, J.L., and HARDING, D.J. “Shuttle Laser Altimeter (SLA),” Proceedings of Shuttle Small Payloads Symposium, NASA CR-3310, Greenbelt, Maryland, September 1995, pp. B., HARDING, D., HOPF, D., KIRKS, K., RABINE, D., and WALSH, N. ![]() Orbit overlap comparisons indicate these Doppler-derived orbits have a meter level (1σ) radial precision, and they agree radially with the combined Doppler and GPS derived orbits at the 1.5 m level (1σ). That approach, along with improved modeling and parameterization have allowed us to compute precise Shuttle orbits from TDRSS-Shuttle Doppler tracking data. However, a new technique utilizing TOPEX/Poseidon’s (T/P) precise orbit knowledge plus the TDRSS-T/P Doppler tracking is used to significantly reduce the TDRS orbit errors. Traditionally, the Tracking and Data Relay Satellite (TDRS) orbits themselves have been the dominant source of error in Shuttle orbit determination during quiescent attitude periods. In some cases, these data were combined with Global Positioning System (GPS) pseudorange observations. In support of SLA-1, precise orbits have been computed from Tracking and Data Relay Satellite System (TDRSS) Doppler observations. On January 11, 1996, the Space Shuttle Endeavor, mission STS-72, was launched, carrying aboard the first of four Shuttle Laser Altimeter (SLA) experiments. ![]()
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