Interferometric phase improvement in multi-look case

In this paper, an intensity optimization based method is proposed to improve the interferometric phase in the multi-look case by polarimetric information fusion. In general, the lower the intensity is, the less reliable is the phase. The reliability of phases can be improved by maximizing the intensity for the multi-look case. For each pixel, an optimal unitary complex vector is found to maximize the lesser intensity of the interferometric pair. The Cloudepsilas coherence optimization method is used for comparison. Using the data collected by SIR-C/X-SAR, the authors demonstrate the effectiveness and the robustness of the proposed approach.