中国近海卫星测高数据的重力异常反演——I.Stokes公式逆运算+2DFFT法

Recovery of Gravity Anomalies from Satellite Altimeter Data in China Seas and Vicinity—— I. Method of Inverse Stokes Formula with 2D FFT

简要介绍了基于Stokes公式逆运算基础上的重力异常FFT反演方法。据此 ,在对 4年的Topex/Poseidon卫星测高数据和一年半的ERS 1/ 35天卫星测高数据的预处理基础上 ,反演了中国海域 (0°～ 4 0°N ,10 5°～ 135°E)的 30′× 30′重力异常———IGG。通过与实际船测资料和国际同行提供的重力模型相比 ,IGG总体精度达到 10× 10 - 5m/s2 。

After a brief introduction to the gravity recovery method based on the inverse Stokes formula with FFT techniques, four year altimeter data from Topex/Poseidon and one and half year altimeter data from ERS 1/35days are pre processed, staked and used to recover the 30′×30′ gravity anomalies in China Seas and vicinity (0°～40°N, 105°～135°E)——IGG. From the comparisons with practical ship borne data and external data sets of SIO and KMS, respectively, it can be seen clearly that the accuracy of IGG archives 10×10 -5 m·s -2 (RMS) which is almost the same as that of external data sets.