Accuracy assessments of recent Earth gravity models using crossover altimetry.

Details Accuracy assessments of recent Earth gravity models using crossover altimetry. Accuracy assessments of recent Earth gravity models using crossover altimetry.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996stgg...40...77k&link_type=abstract

Stud. Geophys. Geod., Vol. 40, No. 1, p. 77 - 110

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Geopotential: Artificial Satellites, Earth: Gravitation

Scientific paper

The calibrated variance-covariance matrices of the harmonic geopotential coefficients of the recent combined model JGM 2 has been tested and verified by independent crossover altimetry from TOPEX/Poseidon and ERS 1 using the latitude lumped coefficients in the southern oceans area. Although orbits are not yet available for these missions with other recent models for which errors matrices have been released, by comparison with JGM 2 results and field differences the authors also confirm that the error matrices for the satellite model GRIM 4Sp and the combined data model JGM 3 are also generally valid. Projection of these matrices for a variety of inclinations show that many unused orbits of even moderate altitude (about 80 km) will still yield trajectory crossover errors at a level of many tens of centimeters even with the latest orbit-geopotential models.

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