Two dimensional bandwidth extrapolation technique for polarimetric radar images

The resolution of a radar image, such as SAR (synthetic aperture radar) image, in range and azimuth is determined by the transmitted bandwidth and the synthetic aperture length, respectively. Various super-resolution techniques for improving resolution have been proposed, and the authors have proposed an algorithm that we call polarimetric bandwidth extrapolation (PBWE). To apply PBWE to a radar image, one needs to first apply PBWE in the range direction and then in the azimuth direction, or vice versa. In this paper, PBWE is further extended to two dimensional cases. Two dimensional PBWE (2D-PBWE) utilizes two dimensional polarimetric linear prediction model and expand the spatial frequency bandwidth in range and azimuth directions simultaneously. The performance of the 2D-PBWE is shown through a simulated radar image and a real polarimetric SAR (synthetic aperture radar) image.