Multiband Radar Signal Coherent Processing Algorithm for Motion Target

In real application, most aerial targets are movable. In this paper, an effective multiple subbands coherent processing method is proposed formoving target. Firstly, an echoed signalmodel ofmotion target based on geometrical theory of diffraction is established and the influence of velocity on range profile of the target is analyzed. Secondly, a method based on minimum entropy principle is used to compensate velocity. Then, incoherent factors including a quadratic phase term, a linear phase factor, a fixed factor, and an amplitude difference termare analyzed. Subsequently, efficient methods are applied to estimate other incoherent factors, except that the quadratic term is small enough to be ignored. Finally, the feasibility and performance of the proposed method are investigated through numerical simulation.