Recovering Earth’s Gravitational Field Model Using GOCE Orbits and Gravity Gradients

In order to achieve the ambition of VOCE，a Fortran program is compiled for recovering Earth’s gravitational field model. A filter approach is designed for gravity gradients based on Fourier series.Several gravity field models are recovered by using VOCE PKI orbits and gravity gradients.The results show that the recovering ability of VOCE orbits is up to 120 degree and order. The gravity gradients are influenced by polar gaps more serious than orbits. An Earth’s gravitational field mode1 up to degree and order 200 named SWJTU2013U0 has been resolved by combining 70 days VOCE orbits and gravity gradients between 2009-11-02一2010-01-10.The precision of the model is well，but slightly less than the precision of GO_CONS_GCF_2_TIM_R3 as shown by internal and external valilotion.