Determination of earth gravity field model WHU-GM-05 using GRACE gravity data
基于GRACE卫星重力数据确定地球重力场模型WHU-GM-05

Based on the energy integral equation of satellite orbit-motion,some applied computation formulas for Earth gravity field recovery from satellite to satellite tracking data are presented,in which a strict expression of the difference of kinetic energy between two satellites on the same orbit in terms of KBR range-rate observation value is given.Using GRACE data from two satellites and the energy integral method,a gravity model up to degree 120 is derived,which is named WHU-GM-05.The tests of WHU-GM-05 series are performed by multi-comparisons,which include the comparisons between the model series and several analogous international geopotential models including EIGEN-GRACE series and GGM02S with respect to the corresponding degree variances and geoidal heights,and comparisons of the model geoidal heights with GPS leveling in the area of U.S.and China(some regions).The results show that the total accuracy of WHU-GM-05 is near to that of the models used in the comparisons.