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Filtering of InSAR interferograms

ABSTRACT: Radar is gaining increasing credibility as a technique for rapid and accurate topographic mapping. Precision and accuracy of elevation and ground displacement assessed from Interferometry SAR (InSAR) depend essentially on phase difference or interferogram quality. The phase noise degrades the visual quality of the interferogram and increases the error in phase unwrapping results. Many methods to decrease speckle noise were applied to SAR intensity images, however these can not be applied directly to the interferogram image since intensity SAR information has a different nature from that of the interferogram. Interferogram filtering decreases problems in phase unwrapping by minimizing the residues number. Several filters have been proposed in the literature. In this paper, we proposed an improved vector filter based on an adaptive window. Results are compared to existing filters.