多分辨率数据输入输出法确定大地水准面

Geoid Determination by Multiresolution Input-output Method

为从量化角度分析在采用输入输出法计算局部大地水准面中,输入数据(重力异常)的分辨率对计算结果的影响,以Moritz协方差函数模型估计功率谱密度函数,基于EGM2008模型重力异常计算了3种不同分辨率的输入数据下大地水准面高,仿真实验结果表明,随着分辨率的提升,将有更多的点能够参与拟合理论协方差函数模型系数,从而使得协方差函数模型在表征局部重力场特性上更加细化,大地水准面高的计算精度随分辨率的提升而提高。

The impacts of the resolution of input data(anomaly)on the calculation accuracy of geoid by using the input and output method is analyzed and quantified.The power spectral density function is constructed by the model of Moritz covariance function,geoids are determined by three different resolution input data which based on the EGM2008 model anomalies,and the result show that,with the enhancement of the resolution,there are more points to be able to participate in the coefficient fitting of the covariance function,so that the covariance function model is more refined in the characterization of the local gravity field,and the accuracy of geoid increases with the enhancement of the resolution.