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《Journal of Geodesy and Geodynamics》 2009-05
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MUTUAL VERIFICATION OF TWO METHODS ON EVALUATING ACCURACY OF GRACE EARTH'S GRAVITATIONAL FIELD

Zheng Wei1,2),Xu Houze1),Zhong Min1),Yun Meijuan3),Zhou Xuhua1) and Peng Bibo1)1)Key Laboratory of Dynamic Geodesy,Institute of Geodesy and Geophysics,CAS,Wuhan 4300772)Disaster Prevention Research Institute,Kyoto University,Uji,Kyoto 611-0011,Japan3)Department of Applied Physics,Wuhan University of Science and Technology,Wuhan 430081  
The accuracies of GRACE Earth's gravitational field complete up to degree and order 120 are evaluated by using the prior Earth's gravitational field model method(PEM)and least-squares covariance method(LSM)on the basis of improved energy conservation principle,respectively.The simulative results are as follows.Firstly,based on the GRACE orbital parameters and accuracy indexes of key payload instruments,the accuracies of geopotential coefficients are 5.192×10-10 and 6.633×10-10 by using the PEM and LSM at degree 120.Secondly,simulative geopotential coefficients degree RMS errors obtained by using the PEM and LSM accord with the measured accuracy of Earth's gravitational field model EIGEN-GRACE02S provided by German GFZ,and the validity of evaluating the accuracy of Earth's gravitational field based on the PEM and LSM is proved.Thirdly,onthe basis of coincidence of simulative geopotential coefficients degree RMS errors obtained by using the PEM and LSM,the algorithm dependability of the GRACE Earth's gravitational field recovery complete up to degree and order 120 based on the energy conservation principle associated with the pre-conditioned conjugate-gradient iterative approach is validated adequately.
【Fund】: 国家自然科学基金(40674038);; 中国科学院知识创新工程重要方向项目(KZCX2-YW-143 KZCX2-YW-202);; 国家高技术研究发展计划(863)(2009AA12Z138 2006AA09Z153);; 日本JSPS基盘研究项目(B19340129)
【CateGory Index】: P223
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