An InISAR Imaging Method Based on Dominant-Scatterer Phase Focusing

Abstract

A new interferometric inverse synthetic aperture radar (InISAR) imaging method based on a L shape three-antenna interferometric radar geometry and dominant-scatterer phase focusing is presented in this paper. Under this InISAR model, the distance of the target in the baseline direction introduces additional interferometric phase offset, which can cause phase ambiguity, so the interferometric phase must be corrected before interferometric processing. Firstly, a strong scattering point is searched for as a reference point in the image domain, and then the phase of the scattering point is used as the reference phase for phase focusing on each ISAR image respectively to unwrap the interferometric phase, so that the 3D coordinates of the target can be correctly retrieved. Simulation results confirm the effectiveness of the method.