Phase unwrapping for interferometric SAR using multibaseline joint data group

Phase unwrapping is the key problem in building the digital elevation model (DEM) of a scene from interferometric synthetic aperture radar (SAR) system data. In this paper, we propose a method of phase unwrapping based on the model of the multibaseline joint data group. The method can not only adaptively coregister the SAR images, but also accurately provide the accurate estimation of the terrain unwrapped phase in the presence of the large coregistration errors. Moreover, the improvement in computational complexity is achieved by using the multibaseline joint data group. The method is investigated by simulations, and results show successful phase unwrapping even if the image coregistration error is close to one pixel.