Gravity field recovery from GOCE orbits using the energy conservation approach

The sum of the dissipative energy and energy constant of the GOCE satellite is found by a priori gravity field model at first,and the GOCE dissipative energy is obtained by computing the adjacent epoch difference via the differential method.Then,a gravity field model GOCE-ECP01,which up to the degree and order 80,is recovered by the energy conservation approach from the 103-day precise orbital data of the GOCE satellite collected from November 1,2009 to January 12,2010.Finally,the model is compared with existing models EGM96,ITG-CHAMP05S,EIGEN-GRACE2010S,EIGEN-6C and GOCONSGCF2DIRR3.The results show that at the same order and degree,the accuracy of model GOCE-EBP01 is higher than those of models EGM96 and ITG-CHAMP05S,but lower than those of models EIGEN-GRACE2010S,EIGEN-6C and GOCONSGCF2DIRR3,which is mainly caused by the pole gap.