Gravity model improvement using GEOS 3 /GEM 9 and 10/

Details Gravity model improvement using GEOS 3 /GEM 9 and 10/ Gravity model improvement using GEOS 3 /GEM 9 and 10/

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.3897l&link_type=abstract

Journal of Geophysical Research, vol. 84, July 30, 1979, p. 3897-3916.

Physics

38

Geos 3 Satellite, Gravity Anomalies, Ocean Surface, Radio Altimeters, Earth Observations (From Space), Geodetic Coordinates, Geopotential, Gravimetry, Orbital Position Estimation, Satellite Tracking, Satellite-Borne Radar, Terrain Analysis, Topography

Scientific paper

Although errors in previous gravity models have produced large uncertainties in the orbital position of GEOS 3, significant improvement has been obtained with new geopotential solutions, Goddard Earth Model (GEM) 9 and 10. The GEM 9 and 10 solutions for the potential coefficients and station coordinates are presented along with a discussion of the new techniques employed. Also presented and discussed are solutions for three fundamental geodetic reference parameters, viz. the mean radius of the earth, the gravitational constant, and mean equatorial gravity. Evaluation of the gravity field is examined together with evaluation of GEM 9 and 10 for orbit determination accuracy. The major objectives of GEM 9 and 10 are achieved. GEOS 3 orbital accuracies from these models are about 1 m in their radial components for 5-day arc lengths. Both models yield significantly improved results over GEM solutions when compared to surface gravimetry, Skylab and GEOS 3 altimetry, and highly accurate BE-C (Beacon Explorer-C) laser ranges. The new values of the parameters discussed are given.

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