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《Chinese Journal of Geophysics》 2015-03
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A study on the improvement in spatial resolution of the Earth′s gravitational field by the next-generation ACR-Cartwheel-A/B twin-satellite formation

ZHENG Wei;HSU Hou-Tse;ZHONG Min;YUN Mei-Juan;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;  
Because the design defects(e.g.,the orbital altitude could not be substantially decreased,the measurement accuracy of space-borne instrumentations is unable to be sufficiently improved,and the isotropic gravity information is incapable of being simultaneously acquired,etc.)of the present twin Gravity Recovery and Climate Experiment(GRACE)satellites have resulted in poor spatial resolution of the Earth′s gravitational field,this study aims to carry out the feasibility demonstrations regarding the next-generation ACR(Along-Cross-Radial)-Cartwheel twin-satellite formation for improving the spatial resolution of the Earth′s gravitational field by the intersatellite range-rate interpolation method.The research on improving the accuracy of the Earth′s gravitational field by the Radial-Cartwheel and Inclined-Cartwheel twin-satellite formation has been developed using the short-arc integral approach.The disadvantage of the short-arc integral approach is that the accuracy of the Earth′s long-wavelength gravitational field is apt to be decreased owing to a shorter orbital arc of about 30 minutes.The different methods of satellite gravity recovery have different sensitivities to the signal spectrum of gravity field.Unlike previous recovery methods,we perform the exploratory investigations on optimizing spatial resolution by the future ACR-Cartwheel-A/B twin-satellites formation based on the six-point intersatellite range-rate interpolation method.Firstly,the Earth′s gravitational field from ACR-Cartwheel-A/B complete up to degree and order 120 is precisely recovered using the satellite orbital parameters and the measurement precision of key payloads from the twin GRACE satellites.The research results show that the accuracy of the Earth′s gravitational field determination from the next-generation ACR-Cartwheel twin-satellite formation is averagely improved by 2.6 times than that from the EIGENGRACE02 S model released by the German GeoForschungsZentrum Potsdam(GFZ),which sufficiently verifies that the next-generation ACR-Cartwheel twin-satellite formation is obviously better than the current GRACE collinear formation.Secondly,the Earth′s gravitational field complete up to degree and order 120 is accurately measured based on the satellite orbital parameters(e.g.,orbital altitude of 350 km,intersatellite range of 100 km,orbital inclination of 89°and orbital eccentricity of 0.0046),the measurement precision of key payloads(e.g.,10-7 m·s-1 in intersatellite range-rate,10-3 m in orbital position,10-6 m·s-1in orbital velocity and 10-11 m·s-2in nonconservative force),an observation time of 30 days and a sampling interval of 10 sby the Lo-AR(Longitudinal-Along-Radial)-Cartwheel-A/B,La-AR(Latitudinal-Along-Radial)-Cartwheel-A/B and ACR-Cartwheel-A/B twin-satellite formations using the intersatellite range-rate interpolation method,and the cumulative geoid height errors are 5.115×10-4 m,4.923×10-4 m and 3.488×10-4 m,respectively.Since the orbital stability of the La-AR-Cartwheel-A/B formation is superior to the Lo-AR-Cartwheel-A/B formation,the accuracy of satellite gravity recovery from the La-AR-Cartwheel-A/B formation is higher than that from the Lo-AR-Cartwheel-A/B formation.Because the ACR-Cartwheel-A/B twin-satellite formation can synchronously obtaingravity information in the along-track,cross-track and radial-track directions,satellite observation data are provided with some strongpoints consisting of homogeneity,isotropy,and so on.On all accounts,the next-generation ACR-Cartwheel twin-satellite formation will prospectively play a significant role in producing the Earth gravity field model with higher accuracy and resolution.
【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项目择优资助基金(2011);; 中国科学院卢嘉锡青年人才和青年创新促进会基金(2013);; 国家民用空间基础设施项目子课题(2014);; 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(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(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(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)联合资助
【CateGory Index】: P223
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