The accuracy of Goddard earth models

Details The accuracy of Goddard earth models The accuracy of Goddard earth models

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976agem.book.....w&link_type=abstract

Unknown

Statistics

Computation

19

Geodesy, Geopotential, Gravimetry, Altimeters, Graphs (Charts), Lasers, Mathematical Models, Orbital Resonances (Celestial Mechanics), Satellite Orbits, Satellite-Borne Instruments, Tables (Data)

Scientific paper

Extensive tests of Goddard geopotential models have been made with observations not used in the solutions. These tests show the accuracy of the satellite derived model (GEM 7, with 400 coefficients) to be about 4.3 m (rms) with respect to the computation of the global geoid surface. The formal precision of this solution is 0.7 m. The corresponding accuracy of the combined satellite surface gravimetry model (GEM 8, with 706 coefficients) is found to be 3.9 m (rms). Independent observations used in this assessment include: 125 lumped coefficients from 35 resonant orbits of 1 and 9 through 15 revolutions per day, two sets of (8,8) fields derived from optical-only and laser-only data, sets of zonal and resonant coefficients derived from largely independent sources and geoid undulations measured by satellite altimetry. In addition, the accuracy of GEM 7 has been judged by the gravimetry in GEM 8. The ratio of estimated to formal error in GEM 7 and 8 ranges from 2 to 5.

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