Application of Multi-Look Techniques for Interferometric SAR Data

Abstract

Two different multi-look techniques for interferometric SAR data are investigated in this paper. The first one uses the box-car type of filter on the complex interferogram in the spatial domain, whereas the second one performs look-wise filtering of the individual images in the spectral do-main. The investigation starts with the analytical compari-son of the two techniques and the experimental analysis of interferometric phase noise reduction. Next, it is show that the flexibility of the spectral domain multi-look technique can be used for improved motion compensation and fur-ther for precisely updated estimation of azimuth misregis-tration offsets. This leads finally to the compensation of residual motion errors in case of multi-pass SAR interfe-rometry. The comparison is quantified using data of the DLR owned airborne E-SAR system.