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《Science of Surveying and Mapping》 2005-05
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Two methods for recovering gravitational potential from the ephemerides of CHAMP

LU Xiao-lei①,SHAO Cheng-gang②,WANG Neng-chao①(①3Department of mathematics,Huazhong University of Science & Technology.Wuhan,Hubei,430074;②Department of Physics,Huazhong University of Science & Technology.Wuhan,Hubei,430074)  
In this paper,observation equations are constructed according to the numerical differentiation based on Newton's law of motion and the energy conservation respectively.The gravitational potential coefficients are recovered until degree 50 based on simulated CHAMP ephemerides.The sensitivity to different precision are analyzed considering the errors in the satellite position,velocity and acceleration of CHAMP.The merits and disadvantages of these two methods are demonstrated.
【CateGory Index】: P223
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