利用GOCE卫星轨道反演地球重力场模型

根据积分方程法反演地球重力场的数学模型,利用GOCE卫星2009-11-02～2010-01-02共61d的精密轨道数据反演了几组地球重力场模型。结果表明,GOCE卫星轨道能有效提取地球重力场的长波信息,弥补了GOCE卫星重力梯度带宽的限制,在106阶次的大地水准面误差为±9.6cm,该阶次精度优于EIGEN-CHAMP03S及GRACE卫星两个月轨道反演地球重力场的精度,但由于两极空白,反演的带谐位系数精度偏低。联合GOCE及GRACE卫星轨道反演的模型在106阶次的大地水准面误差为±6.9cm,弥补了GOCE卫星轨道的缺陷。

Recovering Earth's Gravitational Field Model Using GOCE Satellite Orbits

Mathematical models of integral equation approach to recover the Earth’s gravitational field have been presented.Several gravitational field models have been recovered based on GOCE orbits of 61 days from 2009-11-02 to 2010-01-02.The results show that the long wavelength information of gravitational field can be effectively extracted from GOCE orbits,which complements the band-limitation of GOCE gradiometers.The geoid height error is ±9.6 cm with degree and order 106.The precision is higher than that from EIGEN-CHAMP03S and GRACE model from 2 months orbits.But the precision of zonal coefficients is low due to the polar gap.The geoid error of the model which combines the orbits of GOCE and GRACE satellites is ±6.9 cm with degree and order 106,which complements the orbital deficiency of GOCE satellite.