Abstract:A novel Ground Moving Target Indication(GMTI) algorithm is presented to detect slow moving targets by using the range walk migration in single-antenna synthetic aperture radar. Two filters,which differ only in signs of phase responses, are utilized to change the range walk migration rates of the echo after the range compression, and two images are generated therewith. In the two images, stationary targets have the same range walk migration rates after the filtering; nevertheless, the range walk migration rates of the moving targets are different. Therefore, moving targets can be indicated by the complex subtraction of the two images. Simulations are conducted to prove that slow moving targets which are submerged by the clutter can be detected by the proposed algorithm.