An iterative Wiener filtering method based on the gravity gradient invariants

An iterative Wiener fltering method based on the

gravity gradient invariants

Zhou Rui*,Wu Xiaoping

【摘 要】A B S T R A C T：How to deal with colored noises of GOCE(Gravity feld and steady—state Ocean Circulation Explorer)satellite has been the key to data processing.This paper focused on colored noises of GOCE gradient data and the frequency spectrum analysis.According to the analysis results,gravity feld model of the optimal degrees 90—240 is given,which is recovered by GOCE gradient data.This paper presents an iterative Wiener fltering method based on the gravity gradient invariants.By this method a degree-220 model was calculated from GOCE SGG(Satellite Gravity Gradient)data.The degrees above 90 of ITG2010 were taken as the prior gravity feld model,replacing the low degree gravity feld model calculated by GOCE orbit data.GOCE gradient colored noises was processed by Wiener fltering.Finally by Wiener fltering iterative calculation,the gravity feld model was restored by space-wise harmonic analysis method.The results show that the model's accuracy matched wellwith the ESA's(European Space Agency)results by using the same data. 【期刊名称】大地测量与地球动力学（英文版） 【年(卷),期】2015(006)004 【总页数】6