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《Progress in Geophysics》 2014-05
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Gravity field modeling by using the short-arc integral approach and GOCE orbits

SU Yong;FAN Dong-ming;School of Geoscience and Environment Engineering,Southwest Jiaotong University;  
The short-arc integral approach which based on Newton's equation of motion formulates the satellite orbit as a boundary value problem in the form of the Fredholm type integral equation,this approach does not require any initial values of unknown parameters and reference gravity models,and the observation equation is linear and does not contain the velocity vector.The non-conservative force of GOCE satellite is largely compensated by the drag-free control and the residual acceleration is absorbed by the empirical acceleration.Spherical harmonic coefficients is resolved with local parameters which contains bias and amplitude parameters of the residual acceleration and boundary arc correction vectors.Two gravity field models, which named GOCE-SAIA01S and GOCESAIA02S,are recovered based on GOCE precision orbits of 92-days from 2009-11-01 to 2010-01-31 with the short-arc integral approach.The results show that the accuracy of the recovered gravity field model is of non-significance for its improvement when the order of the polynomial interpolation exceeds 9;the gravity field model with the best accuracy is recovered by 20 min arc length which is compared with 90 min cycle of the GOCE satellite.The geoid error of the model GOCE-SAIA01S is ±4.3 cm with degree and order 120,the accuracy of the model GOCE-ECP01S is higher than the model ITG-CHAMP05S with degree and order 6 to 120,and the precision of zonal coefficients is low due to the polar gap.
【Fund】: 高等学校博士学科点专项科研基金(2012018412006);; 中央高校基本科研业务费专项资金(SWJTU10ZT02和SWJTU12BR012);; 西南交通大学博士研究生创新基金联合资助
【CateGory Index】: P223
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