基于地面重力的卫星重力梯度检校方法  

Calibration of satellite gravity gradients based on ground gravity data

作　　者：瞿庆亮 常晓涛[1,2] 朱广彬 于胜文 周苗[1,2] 刘伟 QU QingLiang;CHANG XiaoTao;ZHU GuangBin;YU ShengWen;ZHOU Miao;LIU Wei(College of Geomatics,Shandong University of Science and Technology,Shandong Qingdao 266590,China;Land Satellite Remote Sensing Application Center,Ministry of Natural Resources,Beijing 100048,China)

机构地区：[1]山东科技大学测绘科学与工程学院,山东青岛266590 [2]自然资源部国土卫星遥感应用中心,北京100048

出　　处：《地球物理学报》2021年第8期2590-2598,共9页Chinese Journal of Geophysics

基　　金：高分对地观测重大专项(42-Y20A09-9001-17/18);民用航天预先研究项目(D010103);自然资源部地球观测与时空信息科学重点实验室开放基金(201907);武汉大学地球空间环境与大地测量教育部重点实验室开放基金资助项目(18-01-05)资助.

摘　　要：卫星重力梯度仪在轨检校是提高梯度模式重力卫星观测质量的关键.本文面向中国未来梯度模式重力卫星规划任务,研究提出一种基于地面重力的卫星在轨检校方法,该方法顾及卫星设计指标,从地面先验重力数据的精度、空间尺度以及卫星重力梯度仪的观测噪声等卫星检校要素开展分析研究,成功实现地面数据与卫星观测数据的比对检校.研究结果表明,在12°×12°的地面检校区域内,利用精度优于1 mGal的地面重力观测数据即可实现噪声低于10 mE的重力梯度仪高精度在轨检校.The on-orbit calibration of satellite gravity gradiometer is the key to improving the observation quality of satellite gradiometry.This paper proposes an on-orbit calibration method based on ground gravity data for China's future satellite gravity gradiometry mission.Considering the possible mission requirements,this method analyzes the precision and covered area of a priori ground gravity data,as well as the noise of gradiometer observations.The satellite observations are successfully calibrated based on the ground gravity data.The results show that with ground gravity data in a calibration area of 12°×12°and accuracy better than 1 mGal,noise magnitude of the gradiometer less than 10 mE can be fulfilled for high-precision on-orbit calibration of the gravity gradiometer.

关 键 词：卫星重力梯度 在轨检校 地面重力 向上延拓 

分 类 号：P223[天文地球—大地测量学与测量工程]