Effect of different inter-satellite range on measurement precision of Earth’s gravitational field from GRACE  

作　　者：Zheng Wei Hsu Houtse Zhong Min Yun Meijuan Zhou Xuhua 

机构地区：[1]State Key Laboratory of Geodesy and Earth＇ s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China [2]Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-001l, Japan [3]Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China [4]Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China

出　　处：《Geodesy and Geodynamics》2012年第1期44-51,共8页大地测量与地球动力学（英文版）

基　　金：supported by the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences for Distinguished Young Scholar(KZCX2-EW-QN114);the National Natural Science Foundation of China(41004006,41131067,11173049);the Merit-based Scientific Research Foundation of the State Ministry of Human Resources and Social Security of China for Returned Overseas Chinese Scholars(2011);the Open Research Fund Program of the Key Laboratory of Geo-Informatics of State Bureau of Surveying and Mapping(201031);the Open Research Fund Program of the Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences(2011-04);the Frontier Field Program of Knowledge Innovation of Institute of Geodesy and Geophysics of Chinese Academy of Sciences;the Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(PLN1113);the Hubei Province Key Laboratory of Refractories and Ceramics Ministry-Province jointly-Constructed Cultivation Base for State key Laboratory(G201009)

摘　　要：The precision of Earth＇s gravitational field from GRACE up to degree and order 120 was studied for different inter-satellite ranges using the improved energy conservation principle. Our simulated result shows that： For long wavelength （L≤20） at degree 20, the cumulative geoid-height error gradually decreased with increasing range, from 0. 052 cm for 110 km to 1. 156 times and 1. 209 times as large for 220 km and 330 kin, respectively. For medium-wavelength （ 100 ≤ L ≤ 120） at degree 120, the cumulative geoid-height error de- creased from 13. 052 cm for 110 km, to 1. 327 times and 1. 970 times as large for the ranges of 220 km and 330 km, respectively; By adopting an optimal range of 220 ± 50 km, we can suppress considerably the loss of precision in the measurement of the Earth＇ s long-wavelength and medium-wavelength gravitational field.The precision of Earth＇s gravitational field from GRACE up to degree and order 120 was studied for different inter-satellite ranges using the improved energy conservation principle. Our simulated result shows that： For long wavelength （L≤20） at degree 20, the cumulative geoid-height error gradually decreased with increasing range, from 0. 052 cm for 110 km to 1. 156 times and 1. 209 times as large for 220 km and 330 kin, respectively. For medium-wavelength （ 100 ≤ L ≤ 120） at degree 120, the cumulative geoid-height error de- creased from 13. 052 cm for 110 km, to 1. 327 times and 1. 970 times as large for the ranges of 220 km and 330 km, respectively; By adopting an optimal range of 220 ± 50 km, we can suppress considerably the loss of precision in the measurement of the Earth＇ s long-wavelength and medium-wavelength gravitational field.

关 键 词：GRACE inter-satellite range colored noise Earth＇ s gravitational field energy conservation principle 

分 类 号：P183[天文地球—天文学] TM935.2[电气工程—电力电子与电力传动]