卫星重力梯度精化局部重力场的径向基函数法  

Radial basis function method for refining regional gravity field from satellite gravity gradient

作　　者：钟波[1,2] 刘滔 李贤炮 谭江涛 ZHONG Bo;LIU Tao;LI Xianpao;TAN Jiangtao(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Key Laboratory of Geospatial Environment and Geodesy,Ministry of Education,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]地球空间环境与大地测量教育部重点实验室,湖北武汉430079

出　　处：《华中科技大学学报（自然科学版）》2022年第9期141-148,共8页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点研发计划资助项目(2018YFC1503503);国家自然科学基金资助项目(41974015,42061134007)。

摘　　要：针对球谐函数方法构建全球重力场模型不能顾及重力场局部特征差异的问题,提出了一种基于卫星重力梯度数据精化局部重力场的径向基函数方法及数据处理方案.以北美地区为例,采用GOCE(地球重力场与静态海洋环流探测)卫星重力梯度数据和ITG-GRACE2010S模型法方程反演的全球重力场为背景模型,通过频域内定权的级联滤波方法抑制重力梯度低频系统误差和有色噪声,基于球面样条核函数和分区正则化策略构建了更符合区域特征的局部重力场模型.利用高精度的GOCO06S模型和GPS(全球定位系统)水准数据进行检核,结果表明:构建的局部重力场模型比同期数据解算的全球重力场模型精度更高,并且新版GOCE数据的解算精度明显优于旧版.Aiming at the problem that global gravity field model constructed by spherical harmonic function ignores the differences of local gravity signals,a radial basis function method and data processing scheme were presented for refining the regional gravity field based on satellite gravity gradient data.The global gravity field joint inverted by GOCE(gravity field and steady-state ocean circulation explorer)satellite gravity gradients and ITG-GRACE2010S normal equation was used as the background model.The low-frequency errors and colored noise of gravity gradient data were suppressed by the cascaded filtering method with frequency domain weighting.Based on the spherical splines function and sub-region regularization method,the regional gravity field models matching for local characteristics of gravity signals were constructed in the North America.To verify the effectiveness of our method,the high-precision gravity field model GOCO06S and GPS(global positioning system)leveling data were used for validation.The results show that the refined regional gravity field model has higher accuracy than the global gravity field model solved by the same period observations,and the inversion accuracy of the new preprocessed GOCE data is better than that of old version.

关 键 词：卫星重力梯度 局部重力场 径向基函数 分区正则化 GOCE(地球重力场与静态海洋环流探测) 

分 类 号：P228[天文地球—大地测量学与测量工程]