Grim4-C1, -C2p: combination solutions of the global earth gravity field
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On the basis of the GRIM4-S1 satellite-only Earth gravity model, being accomplished in a common effort by DGFI and GRGS, a combination solution, called GRIM4-C1, has been derivcd using 1° × 1° mean gravity anomalies and 1° × 1° Seasat altimeter derived mean geoid undulations. In the meantime improvements could be achieved by incorporating more tracking data (GEOSAT, SPOT2-DORIS) into the solution, resulting in the two new parallel versions, the satellite-only gravity model GRIM4-S2 and the combined solution GRIM4-C2p (preliminary). All GRIM4 Earth gravity models cover the spectral gravitational constituents complete up to degree and order 50.
In this report the emphasis is on the discussion of the combined gravity models: combination and estimation techniques, capabilities for application in precise satellite orbit computation and accuracies in long wavelength geoid representation. It is shown that with the new generation of global gravity models general purpose satellite-only models are no longer inferior to combination solutions if applied to satellite orbit restitution.
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- Dorrer, M.: 1989, ‘Le Système Doris’, Cours de Technologie Spatiale du CNES, Cepadues Ed. Toulouse.Google Scholar
- Levitus, S.: 1982, ‘Climatological Atlas of the World Ocean’, NOAA Professional Paper13, 173 pp.Google Scholar
- Marsh, J.: 1985, ‘Seasat Geoid Heights 1/8° × 1/8°’, private communication.Google Scholar
- Marsh, J.et al.: 1989, ‘The GEM-T2 Gravitational Model’, NASA Technical Memorandum 100746, NASA/GSFC.Google Scholar
- McCarthy, D. D.: 1989, ‘IERS Standards’, IERS Technical Note 3, Central Bureau of IERS.Google Scholar
- Medvedev, P. P.et al.: 1990, ‘Comparison of Gravimetric, Altimetric and Satellite Tracking Data on the Earth's Global Gravity Field’,Bureau Gravimétrique International, Bulletin d'Information 67, 143–149.Google Scholar
- Melbourne, W.et al.: 1983, ‘Project MERIT Standards’, U.S. Naval Observ., Circular No. 167.Google Scholar
- Rapp, R. H. and Cruz, J. Y.: 1986a, ‘Spherical Harmonic Representation of the Earth's Gravitational Potential to Degree 360 using 30′ Mean Anomalies’, Report No. 376, Dept. of Geod. Sci. Surv., Ohio State University, Columbus.Google Scholar
- Rapp, R. H. and Pavlis, R. K.: 1990, ‘The Development and Analysis of Geopotential Coefficient Models to Spherical Harmonics Degree 360’,Journal of Geophysical Research 95, 21885–21933.Google Scholar
- Tapley, B. D.et al.: 1990, ‘The TEG-2 Gravitational Potential Model’, Presentation at the American Geophysical Union Fall Meeting, San Francisco.Google Scholar