DEMONSTRATED STUDY ON INFLUENCES OF INTERSATELLITERANGE ON ACCURACY OF GRACE EARTH’S GRAVITATIONAL FIELD
Zheng Wei 1,2) ; Xu Houze 1) ; Zhong Min 1) ; Yun Meijuan 3) ; and Zhou Xuhua 4)
1)Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, CAS, Wuhan\ 4300772)Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan3)Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 4300814)Shanghai Astronomical Observatory, CAS, Shanghai 200030
Abstract：The GRACE Earth’s gravitational field complete up to degree and order 120 is recovered using the improved energy conservation principle and on the basis of different intersatellite ranges. The simulative results are as follows: Firstly, based on the same accuracy indexes of GRACE key payloads, while recovering the longwavelength Earth’s gravitational field (L≤20), with the increase of intersatellite ranges (110 ~ 330 km) little by little, cumulative geoid height errors will be improved gradually. At degree 20, the accuracy of cumulative geoid height is at the level of 0.052 cm based on 110 km intersatellite range, and accuracies are 1.156 times and 1.209 times improved as using 220 km and 330 km intersatellite ranges. Secondly, while recovering the middlewavelength Earth’s gravitational field (100≤L≤120), at degree 120, the accuracy of cumulative geoid height comes to 13.052 cm based on 110 km intersatellite range, and accuracies are 1.327 times and 1.970 times degraded as using 220 km and 330 km intersatellite ranges. Lastly, intersatellite range designed as 220±50 km can effectively suppress the decrease of the accuracies of longwavelength and middlewavelength Earth’s gravitational field induced by improper range.
Zheng Wei,Xu Houze ,Zhong Min et al. DEMONSTRATED STUDY ON INFLUENCES OF INTERSATELLITERANGE ON ACCURACY OF GRACE EARTH’S GRAVITATIONAL FIELD[J]. jgg, 2011, 31(2): 60-65.
