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Precision orbit determination for the Geosat Exact Repeat MissionPrecise ephemerides have been determined for the U.S. Navy Geosat Exact Repeat Mission (ERM) using an improved gravity-field model, PTGF-4A (Shum et al. 1989). The Geosat orbits were computed in a terrestrial reference system which is tied to the reference system defined by satellite laser ranging (SLR) to Lageos through a survey between the Tranet Doppler receiver and the SLR system located at Wettzell, FRG. The remaining Doppler tracking station coordinates were estimated simultaneously with the geopotential in the PTGF-4A solution. In this analysis, three continuous 17-day Geosat orbits, which were computed using the 46-station Tranet data and global altimeter crossover data, have a crossover residual rms of 20 cm, indicating that the Geosat radial orbit error is of the order of 20 cm. The orbits computed based on data collected by a 7-station OPNET tracking network and crossover data have the same level of accuracy.
Document ID
19900042552
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shum, C. K.
(Texas Univ. Austin, TX, United States)
Yuan, D. N.
(Texas Univ. Austin, TX, United States)
Ries, J. C.
(Texas Univ. Austin, TX, United States)
Smith, J. C.
(Texas Univ. Austin, TX, United States)
Schutz, B. E.
(Texas, University Austin, United States)
Date Acquired
August 14, 2013
Publication Date
March 15, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Astrodynamics
Accession Number
90A29607
Funding Number(s)
CONTRACT_GRANT: NAG5-746
Distribution Limits
Public
Copyright
Other

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