Abstract
A good coherence of a SAR interferogram gives precise measurement of surface change. The quality of coregistration between two SLC (Single Look Complex) images influences the coherence. A new coregistration algorithm is proposed. A pixel that has the maximum amplitude is automatically selected to be a center of each correlation window in a master SLC image. This method and employing a large size (128 x 128 pixel) of correlation windows decrease the number of bad offset data. Moreover, 32 times FFT over-sampling of offset field is effective to get subpixel (1/32 pixels) resolution of the pixel offset between two SLC images. The algorithm is tested with JERS-1 SAR images of North Sakhalin to evaluate the performance. The result shows that it enables us to get enough tie points over the whole images with a precision of 0.1 pixel without interactive sampling of them.
