基于GRACE卫星数据的高精度全球静态重力场模型  

GRACE Data-based High Accuracy Global Static Earth's Gravity Field Model

作　　者：陈秋杰[1,2,3] 沈云中[1] 张兴福[4] 陈武[2] 许厚泽 

机构地区：[1]同济大学测绘与地理信息学院,上海200092 [2]香港理工大学土地测量及地理资讯学系 [3]同济大学空间信息与可持续发展应用中心,上海200092 [4]广东工业大学测绘工程系,广东广州510006 [5]大地测量与地球动力学国家重点实验室,湖北武汉430077

出　　处：《测绘学报》2016年第4期396-403,共8页Acta Geodaetica et Cartographica Sinica

基　　金：国家973计划(2012CB957703);国家自然科学基金(41474017;41274035);大地测量与地球动力学国家重力实验室开放基金(SKLGED2014-1-3-E);地理信息工程国家重点实验室开放基金(SKLGIE2014-M-1-2)~~

摘　　要：应用GRACE卫星数据反演高精度静态地球重力场是大地测量学界的热点之一。考虑到经典动力学法线性化误差随弧长拉长而迅速增长,本文以GRACE卫星轨道观测值为初值的线性化方法,建立了应用GRACE卫星轨道和星间距离变率反演地球重力场的改进动力学法理论模型。利用2003年1月至2010年12月的GRACE卫星姿态、轨道、星间距离变率和非保守力加速度等观测数据,解算了一个180阶次的无约束全球静态重力场模型Tongji-Dyn01s和一个采用Kaula规则约束的全球重力场模型Tongji-Dyn01k。与国际不同机构最新发布的纯GRACE数据解算的重力场模型(包括AIUB-GRACE03S、GGM05S、ITSG-Grace2014k和Tongji-GRACE01)进行比较,并利用DTU13海洋重力异常和GPS/水准高程异常进行外部检核,结果表明,Tongji-Dyn01s与国际最新模型精度处于同一水平,然而Tongji-Dyn01k模型总体上更加靠近EIGEN6C2重力场模型。To recover the highly accurate static earth＇s gravity field by using GRACE satellite data is one of the hot topics in geodesy.Since linearization errors of dynamic approach quickly increase when extending satellite arc length,we established a modified dynamic approach for processing GRACE orbit and range-rate measurements in this paper,which treated orbit observations of the twin GRACE satellites as approximate values for linearization.Using the GRACE data spanning the period Jan.2003 to Dec.2010,containing satellite attitudes,orbits,rangerate,and non-conservative forces,we developed two global static gravity field models.One is the unconstrained solution called Tongji-Dyn01 scomplete to degree and order 180;the other one is the Tongji-Dyn01 k model computed by using Kaula constraint.The comparisons between our models and those latest GRACE-only models（including the AIUB-GRACE03,the GGM05 S,the ITSG-Grace2014 kand the Tongji-GRACE01）published by different international groups,and the external validations with marine gravity anomalies from DTU13 product and height anomalies from GPS/levelling data,were performed in this study.The results demonstrate that the Tongji-Dyn01 shas the same accuracy level with those of the latest GRACE-only models,while the TongjiDyn01 kmodel is closer to the EIGEN6C2 than the other GRACE-only models as a whole.

关 键 词：GRACE静态重力场 动力学法 线性化 正则化 

分 类 号：P223[天文地球—大地测量学与测量工程]