Weak target detection based on keystone transform

The improvement of the capability to detect moving target with very small radar signature is usually realized by long term accumulation. According to the design principle of conventional PD (Pulse Doppler) radar, target's range migration can't exceed half of the range resolution cell in coherent integration time, which means that the accumulation time is restrained by target's motion. For high range resolution radar or the radar system focusing on the detection of fast moving targets, such a restriction is difficult to satisfy, In this paper, a novel motion compensation method based on keystone transform is presented, which can correct range migration without the exact value of target velocity, and as a result, make the accumulation time free of the restriction due to target motion.