A multi-domain combined GRACE de-striping filtering method taking in-to account spatial complementarity of geographic latitude
An important issue that limits the effectiveness of the application of time-varying satellite gravity field model is the influence of noise in the spherical harmonic coefficients,which is mainly manifested in the signal recovery of the Earth's surface mass field by the north-south striping(NSS)noise and random noise.In order to effectively suppress the NSS noise,a multi-domain combined gravity recovery and climate experiment(GRACE)de-striping filter is proposed in this paper,which combines the advantages of the Swenson & Whar(S&W)decorrelation filter and the multi-channel singular spectrum analysis in the spatial domain(SSAS)filter,and utilizes the least-squares method and the multichannel singular spectrum analysis to take into account the signal characteristics in the spectral and spatial domains.The results show that,compared with the tradi-tional filters,the combined filter proposed in this paper can adapt to the filtering needs of different latitudes,effectively elimi-nate the NSS noise effects in the middle and high latitudes and low latitudes,retain more geophysical signals,and improve the possibility of observing small-scale signals.
万方数据
维普
