On Numerical methods for determination of Earth gravity field model using mass satellite gravity gradiometry data

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Zhu Guangbin Chang XiaotaoLi XinfaZhang Xinhang and Li Yuxing Satellite Surveying and Mapping Application CenterNASGBejing China The First Institute of Surveying and Mapping of Hebei ProvinceShijiazhuang China [1 ,1 ,2 ,2 ,1 ,1 ,100830 ,2 ,50031 ]
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GeodesyandGeodynamics. | 2012年 / 3卷 / 01期
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摘要：
On the basis of Space-Wise Least Square method,three numerical methods including Cholesky decomposition,pre-conditioned conjugate gradient and Open Multi-Processing 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.Pre-conditioned conjugate gradient method can improve the computation efficiency of huge matrix inversion,but it also brings a certain loss of precision.The application of Open Multi-Processing parallel algorithm could achieve a good compromise between accuracy and computation efficiency.
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