各向异性局部重力场计算的谱方法

The Spectral Methods for Computation of Non isotropic Local Gravity Field

本文所采用的基于输入－输出系统论的谱方法在计算结果的精度上与最小二乘配置方法相当，却很容易用于异性场的计算。用该谱方法对卫星测高及海洋重力资料进行组合求解重力场量（大地水准面差距和重力异常），其误差估计结果表明各向异性场的计算精度优于各向同性场的精度。

In this paper, the spectral methods based on the input output system theory (IOST) were used to compute quantities related to the gravity field. These method are almost equivalent to least squares collocation (LSC) method in the accuracies of results, but they can use both isotropic and non isotropic power spectral density functions (PSD s) easily. The recovery of the gravity field is made by combining salellite altimeter data and sea gravity data. The results show that higher prediction accuracies are always obtained when using non isotropic information instead of the isotropic one.