Gravity models from CHAMP and other satellite data

Details Gravity models from CHAMP and other satellite data Gravity models from CHAMP and other satellite data

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.g32a0730l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #G32A-0730

Computer Science

Performance

1214 Geopotential Theory And Determination, 1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1241 Satellite Orbits, 1243 Space Geodetic Surveys

Scientific paper

CHAMP spacecraft is the first of a series of new spacecraft missions that are revolutionizing our ability to model the Earth's geopotential. We report on the analysis of over 100 days of CHAMP data in 2001 and 2002, merged with tracking data of other satellites such as Jason, Topex, GFO, Starlette, Stella, Spot-2, as well as satellite altimetry. We find that the CHAMP-only component of these solutions is a significant improvement over pre-CHAMP satellite only models with respect to the high degree information expressed by the geopotential model coefficients. For example, the variance of the differences with altimeter-derived anomalies through degree 70 is 2.80 mGal2 for the CHAMP-only solution based on 87 days of data vs. 10.19 mGal2 for EGM96S. Nonetheless, in order to model properly the various resonances to which different satellites are sensitive, we must include other satellite data. We compare the performance of these new CHAMP derived solutions with EGM96 and the EIGEN series of solutions. We review carefully the performance of these models for altimetric satellites.

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