ON NUMERICAL METHODS FOR DETERMINATION OF EARTH GRAVITY FIELD MODEL USING MASS SATELLITE GRAVITY GRADIOMETRY DATA
Zhu Guangbin 1) ; Chang Xiaotao 1) ; Zou Xiancai 2) ; Xu Xinyu 2) ; and Wang Jianqiang 3)
1)Satellite Surveying and Mapping Application Center, SBSM, Bejing 100830;2)School of Geodesy and Geomatics, Wuhan University, Wuhan 430079;3)Institute of Surveying and Mapping, East China Institute of Technology, Fuzhou 344000
Abstract：On the basis of SpaceWise Least Square method, three numerical methods including Cholesky decomposition, Preconditioned conjugate gradient and Open MultiProcessing parallel algorithm are applied into the determination of gravity field with satellite gravity gradiometry data. The results show that, Cholesky decomposition method has been unable to meet the requirements of computation efficiency when the computer hardware is limited. Preconditioned conjugate gradient method can improve the computation efficiency of huge matrix inversion, but it also brings a certain loss of accuracy. The application of Open MultiProcessing parallel algorithm could achieve a good compromise between accuracy and computation efficiency.
Zhu Guangbin ,Chang Xiaotao ,Zou Xiancai et al. ON NUMERICAL METHODS FOR DETERMINATION OF EARTH GRAVITY FIELD MODEL USING MASS SATELLITE GRAVITY GRADIOMETRY DATA[J]. jgg, 2011, 31(6): 140-144.
