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《Chinese Journal of Geophysics》 1993-06
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RESEARCH ON ACCURACIES FOR SATELLITE GRAVITY GRADIOMETRY AND EARTH'S GRAVITATIONAL FIELD

MENG JIA-CHUN LIU SHANG-YU(Institute of Geodesy and Geophysics, Academia Sinica, Wuhan 430077)  
According to the spherical harmonics expansion of the Earth's gravitational potential in this paper, the accuracy estimation formulas of the potential coefficient model are derived by the components of gravity gradient tensor. In three different aspects the investigations have been carried out: Assuming the measured accuracy of satellite gradiometer, we make an approach to the accuracies of the Earth's gravity field model determined by the gravity gradient data; The orbital errors due to the potential coefficient model and atmospheric drag for the gradiometry satellite are obtained; Finally, the influence of orbital errors and potential coefficient errors on the gravity gradient measurements are conversely found out. The numerical computations show that the satellite gravity gradiometry can increase the accuracies of gravity field model by 3-5 times at least in comparison with the ground technique and conventional satellite methods; The accuracy of gravity quantities obtained by all components of gravity gradient tensor will make an improvement of more than 40% on that of the only radial component Vrr. If the errors in potential coefficient model and in atmospheric drag are only considered, the influences ΔVi3 (i = 3,2,1) of the orbital errors on gradiometer measurements can satisfy ΔVi3≤σ at least in the 1/4, 1/3 circle of influence respectively.
【Fund】: 国家自然科学基金;;中国科学院资助的课题
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