Preprocessing to improve the quality of SAR interferogram

Abstract

In this paper, the preprocessing method for improving the quality of interferograms is described. The method consists of three processing steps---azimuth filtering, range filtering and oversampling. It is shown that the first two steps are effective to eliminate the decorrelation caused by spectrum misalignment in azimuth and range and the oversampling can eliminate the error introduced by the aliasing because of convolution in frequency domain. The validity of the proposed method is verified by ERS SLC data.