GRACE时变重力场条带误差的加权平均去相关滤波方法  

Analysis on GRACE Gravity Data Based on a Simple Weighted Average De-Correlation Filter

作　　者：鞠晓蕾[1,2,3] 沈云中[1] 陈秋杰[1] 

机构地区：[1]同济大学测绘与地理信息学院,上海市200092 [2]山东交通学院交通土建工程学院,济南市250357 [3]大地测量与地球动力学国家重点实验室,武汉市430077

出　　处：《大地测量与地球动力学》2016年第2期129-132,共4页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41274035,41474017);大地测量与地球动力学国家重点实验室开放基金(SKLGED2015-2-1E,SKLGED2014-2-4E)

摘　　要：提出一种简单、快速的加权平均去相关滤波方法,以滤除GRACE时变重力场存在的显著的南北条带误差,并可以处理球谐位系数中的两端点系数。基于CSR RL05和Tongji-GRACE01时变重力场模型,采用加权平均去相关滤波求得2003~2011南极区域的质量变化速率为-78.35±41.08 Gt/a和-78.06±40.75Gt/a,与多项式拟合去相关滤波求得的结果-81.91±40.75Gt/a和-79.31±40.46Gt/a极为接近。在亚马逊流域,这两种滤波方法求得的结果也极为接近,从而验证了本文方法的有效性。The time-variable gravity field model derived from GRACE contains large north-south strip errors.This paper presents a simple and fast weighted average de-correlation filter method that can effectively remove the north-south strip errors and can be applied to the end points of the spherical harmonic coefficients.Based on CSR RL05 data and Tongji-GRACE01 data from 2003 to 2011,the mass change rates in Antarctica are-78.35±41.08Gt/a and-78.06±40.75Gt/a by the weighted average filter method,which are very close to-81.91±40.75Gt/a and-79.31±40.46Gt/a by the polynomial fitting de-correlation filter.The results derived from the two filters also agree with each other in Amazon,which validates the efficiency of our weighted average filtering method to suppress the north-south strip errors.

关 键 词：GRACE 简单加权平均去相关滤波 质量变化 

分 类 号：P223[天文地球—大地测量学与测量工程]