ISAR Imaging with Micro-motion Components

In practical radar systems, the micro-motions of some scatting points will perform additional frequency modulation effects on echo signals, resulting in the ineffectiveness of traditional algorithm for ISAR imaging. This paper proposes one non-coherent accumulation based method for removing these effects. Pseudo matched filter (PMF) is applied to eliminate micro-Doppler (m-D) effects among range cells firstly. In this step, the first threshold is used to detect the target signal in a range cell. Then time-frequency (TF) analysis for separating the rigid body and the m-D parts in the complex TF domain is employed to weaken m-D effects within range cells. Finally, simulation results validate the feasibility of the approach.