TOPEX orbit determination and gravity recovery using Global Positioning System data from repeat orbits

Details TOPEX orbit determination and gravity recovery using Global Positioning System data from repeat orbits TOPEX orbit determination and gravity recovery using Global Positioning System data from repeat orbits

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1973w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 10, 1992, p. 1973-1979. Research supported by NASA.

Physics

5

Global Positioning System, Gravitational Fields, Orbit Calculation, Satellite Tracking, Topex, Covariance, Ground Tracks, Satellite Orbits

Scientific paper

A covariance analysis is presented for satellite tracking and gravity recovery with a differential Global Positioning System-based technique to be demonstrated on TOPEX in the early 1990s. The technique employs data from an ensemble of repeat ground tracks to recover a unique satellite epoch state for each track and a set of invariant positional parameters common to all tracks. The positional parameters represent the effect of mismodeled gravitational field on the satellite orbit. At an altitude of 1336 km, where gravity modeling is the dominant systematic error, averaging of random error over many arcs and adjustment of the gravity model reduce the final satellite position error. The positional parameters can then be used to produce a refined global gravity model. The analysis indicates that errors ranging from 5 to 8 cm in TOPEX altitude and 0.05 to 0.2 mGal for the gravity field can be achieved, depending on the number of repeat arcs used.

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