GOCE梯度数据坐标系转换及误差分析  

COORDINATE SYSTEM CONVERSION OF GOCE GRADIENTS DATA AND ERROR ANALYSIS

作　　者：苏勇[1] 范东明[1] 黄强[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《大地测量与地球动力学》2014年第3期151-154,159,共5页Journal of Geodesy and Geodynamics

基　　金：高等学校博士学科点专项科研基金项目(2012018412006);中央高校基本科研业务费专项资金项目(SWJTU10ZT02;SWJTU12BR012);西南交通大学博士研究生创新基金项目

摘　　要：分析逐点旋转法模型转换过程中误差对转换结果的影响,给出了梯度张量的转换策略。处理结果表明,GOCE的姿态误差满足设计要求,但GOCE梯度张量观测数据质量非常差,包含大量的低频有色噪声,在转换前需要对观测数据进行滤波处理,且采用"移去-恢复"方法能显著提高梯度数据的转换精度。The gravitational gradients along the orbit observed by GOCE satellite is given in the gradiometer coordinate system（GRF） while the Earth＇ s gravity field model from gradients is generally in non-instrument coordinate system. Due to GOCE can not measure full tensor gradient efficiently, it is necessary to replace Vxy, Vrz as model values and to converse coordinate system of gradient. Therefore, in the rotation process, the error of the gradients data and the error of the rotation matrix have be taken into account. A pointwise rotation model of gradients in various coordinate systems and analysis the impact of various errors in conversion process of gradients were described, and gradients tensor rotation strategy is discussed simultaneously. Actual processing results show that the attitude error of the GOCE meets the design requirements, but the quality of GOCE gradients tensor, is not good for containing a large number of low-frequency colored noises, which needs to filter before conversion. In addition,＂ remove-restore＂ method can significantly improve the accuracy.

关 键 词：GOCE卫星 引力梯度 梯度张量转换 逐点旋转法 误差分析 

分 类 号：P223.0[天文地球—大地测量学与测量工程]