Design of Look Filters in Look Difference Method for SAR GMTI

Moving targets can be detected in SAR images using the difference between two looks because, in the two looks, the images of a stationary target are similar, but the images of a moving target are different. However, the sidelobes in the two looks deteriorate the similarity of the stationary ground between the two looks and thus degrade the performance of this method. In this paper, a scaled Hanning window is designed to generate the two looks with lower sidelobes. The shape parameter of the window is automatically chosen according to the spread of the Doppler spectrum. The results show that this method has a better performance in the suppression of stationary targets than the original method.