Coregistration of interferometric SAR images using spectral diversity

This article presents a technique for the determination of the relative misregistration between two interferometric SAR images. The proposed technique is based on the spectral; properties of the complex SAR signal; Unlike conventional coregistration methods, the proposed technique does not need any interpolation nor cross-correlation procedures and also no coherence or fringe optimization must be performed. Instead, the phase information of different spectral looks is evaluated giving misregistration information on a pixel by pixel basis. The proposed technique is at least as accurate as the conventional algorithms and its implementation is very simple. Airborne repeat-pass interferometric data and simulated ScanSAR data are used to illustrate the operation of the proposed technique.