High speed motion compensation based on the range profile

Abstract

The velocity of the ballistic target in midcourse is very high. For wideband LFM signal and ultra-high speed moving target, the signal will have high-order term in its phase after de-chirp processing, which has a bad influence on the target range profile imaging quality. This paper establishes the model of echo for ultra-high speed target, and analyzes the effect of the target's high speed on the range profile. High speed motion will make range profile broadening. In order to solve this problem, it proposes a motion compensation method. The method estimates the chirp rate via combines Wigner Ville Distribution (WVD) and Hough Transform (HT), and then make compensation for the motion. The method has good aggregation, low signal-to-noise ratio requirements and high estimation accuracy. Simulations show that this method reduces the influence of high speed on the range profile efficiently.