Researches on future ultra-precision CSGM satellite gravity mission in China
ZHENG Wei;XU Houze;ZHONG Min;LIU Chengshu;YUN Meijuan;State Key Laboratory of Geodesy and Earth's Dynamics,Institute of Geodesy and Geophysics,Chinese Academy of Sciences;College of Science,Wuhan University of Science and Technology;
The research demonstrations on the implementation of the future CSGM satellite gravity mission in China were carried out,based on the preferable selection of satellite tracking modes,the optimal combination of key payloads,the preferred design of orbital parameters,the beforehand execution of simulated studies,and the optimum improvement of gravity recovery methods. Firstly,the Satellite-to-Satellite Tracking in the High-Low /Low-Low mode( SST-HL /LL) was used in the future CSGM satellite gravity mission due to the high-accuracy measurement of the Earth's gravitational field,the lower technical requirements and the successful experiences of the current twin GRACE satellites. Secondly,the space-borne instruments consisting of the interferometric laser intersatellite ranging system,the compound GPS receiver,the drag-free system,the center of mass trim assembly,etc. were developed in advance. Thirdly,the orbital altitude of 300 ~ 400 km and the intersatellite range of 100 ±50 km were designed in the unmeasurable area of the existing gravity satellites. Fourthly,the simulation techniques were applied to the holistic processes of the development and operation for CSGM,including scheme demonstration,system design,parts development,production test,practical application and malfunction analysis. Fifthly,the advantages and disadvantages of the satellite orbital perturbation,dynamic,energy conservation and semi-analytic methods were contrastively analyzed,and the new-type,high-precision,high-efficiency and full-frequency satellite gravity recovery methods were investigated. Finally,the expected scientific objectives of the future CSGM satellite gravity mission showed that the cumulative geoid height error is 1 ~ 5 cm and the cumulative gravity anomaly error is 1 ~ 5 mGal at degree 300.
【Fund】： 中国科学院知识创新工程重要方向青年人才项目(KZCX2-EW-QN114);; 国家自然科学基金青年项目(41004006 41202094);国家自然科学基金重点项目(41131067);国家自然科学基金面上项目(11173049);; 国家留学人员科技活动择优资助基金项目(2011);; 武汉大学地球空间环境与大地测量教育部重点实验室测绘基础研究基金项目(11-01-02);; 中国测绘科学研究院地理空间信息工程国家测绘地理信息局重点实验室开放基金项目(201322);; 西安测绘研究所地理信息工程国家重点实验室开放基金项目(SKLGIE2013-M-1-5);; 中国科学院测量与地球物理研究所重要方向项目(Y309451045);; 大地测量与地球动力学国家重点实验室自主项目(Y309491050);; 中国科学院卢嘉锡青年人才和青年创新促进会基金项目(2013)
【CateGory Index】： P223
【CateGory Index】： P223