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《Geomatics and Information Science of Wuhan University》 2006-03
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Precision Analysis of SST Gravity Field Model in China

LUO Jia ~(1) JIANG Weiping~(2) WANG Haihong ~(1) ZOU Xiancai~(1)(1 School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road, Wuhan 430079,China)(2 Research Center of GPS,Wuhan University,129 Luoyu Road,Wuhan 430079,China)  
In this paper,with China as the region in test,the potential of the new satellite gravity technique,satellite-to-satellite tracking,to improve the precision of regional gravity field model is studied.With WDM94 as reference,the gravity anomaly residuals of three models,the latest two GRACE global gravity field models(EIGEN_GRACE02S,GGM02S) and EGM96,are computed and compared.The causes for the differences among the residuals of the three models are discussed.The comparison between the residuals shows that in the selected region,EIGEN_GRACE02S or GGM02S is better than EGM96 in lower degree part(less than 110 degree).From the analysis of the model gravity anomaly residuals,it is found that some systematic errors with periodical properties exist in the higher part of EIGEN and GGM models.The results of the paper can also be taken as references in the validation of the SST gravity data.
【Fund】: 国家自然科学基金资助项目(40304001401740044027400440374006);; 国家教育部博士点专项基金资助项目(20020486003)
【CateGory Index】: P223
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