Phase Unwrapping Algorithms Implemented on a Symbian Based Mobile Device

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Executive Summary

Phase unwrapping is a procedure that allows 3D representation for surfaces when the data is acquired using interferometry based techniques. An interferogram contains phase difference values wrapped onto a fixed range of angles 0-360 degrees. In order to compute surface heights and generate an elevation model, the interferogram have to be unwrapped. This paper presents two 2D phase unwrapping algorithms: the zig-zag approach and the least-squares method, and shows an implementation of them on a mobile device based on Symbian S60 platform. Also, filtering methods (i.e mean filter and vector filter) for preprocessing the interferogram are discussed and implemented. The implementation was tested using SAR (Synthetic Aperture Radar) interferograms.

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