Regularized Differentiation for Insar Phase Unwrapping

摘要

We consider the problem of unwrapping the phase of synthetic aperture radar interferograms. Like several existing approaches, we use an estimate of the gradient of the interferogram phase. Our contribution is to regularize this differentiation process, in a manner that both suppresses noise and allows the estimate to be discontinuous. This allows us to preserve the elevation information present in the phase data, without smoothing away the discontinuities created by phase wrapping. We demonstrate the differentiation with a simple phase unwrapping approach, and apply it to an example interferogram computed from Sentinel-l image data.