摘要
建立了利用扰动重力梯度张量Tzz分量和Txx+Tyy、Tzz-Txx-Tyy组合分量确定地球重力场的调和分析法模型,进一步推导了扰动重力梯度张量对角线三分量的自协方差和互协方差函数的级数展开式,推导了单分量、组合分量与重力位系数之间协方差函数的实用计算公式,给出了利用单分量和组合分量解算地球重力场模型的最小二乘配置法基本原理公式.结果表明,最小二乘配置法具有一定的抗差能力,随着观测数据误差的不断增大,其恢复的重力场模型有效阶次不断降低,精度也不断下降;Tzz-Txx-Tyy组合分量解算重力场模型的精度最高,其次为Tzz分量,Txx+Tyy组合分量最差.
This work constructs the spherical harmonic analysis models for single component T= and composite components Txx＋Tyy, Tzz-Txx-Tyy of disturbed gravity gradients to compute earth＇s gravitational field model（EGM）. Besides, the series expansion formulae of variance and covariance functions of the diagonal components of disturbed gravity gradients are deduced. Then, the practical computational formulae of covariance functions between single component, composite components and the gravity potential coefficients are deduced. Finally, this work presents the fundamental formula of the least squares collocation （LSC） to compute EGM using the single component and composite components. The results show that the LSC is robust to a certain extent and the effective degree and precision of EGM decay gradually with the increase of errors. The precision of the EGM computed by the composite components Tzz-Txx-Tyy is the best, while that of the composite components Txx ＋Tyy is the least.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第5期1572-1580,共9页
Chinese Journal of Geophysics
基金
国家自然科学基金(41174026
41104047
41174017)
中国科学院研究生院地球科学学院博士后基金(2010046)
信息工程大学博士学位论文创优基金资助
关键词
地球重力场模型
调和分析法
最小二乘配置法
卫星重力梯度
GOCE
Earth＇s gravitational field model（EGM）, Spherical harmonic analysis method, Leastsquares collocation（LSC）, Satellite gravity gradient（SGG）, GOCE
作者简介
刘晓刚，男，1983年生，博士，助理研究员，主要从事卫星重力测量研究．E—mail：liuxiaogang一1949@163．com
