A two-step detector based on point spread function feature for multi-channel SAR-GMTI radar

When the energy of a moving target's main-lobe and that of side-lobes are both evidently greater than the average lever of residual clutter plus noise, a moving target may be detected as multiple targets, i.e., the side-lobes may be detected as another targets, which often results in the overload of radar system. However, the side-lobes may not be removed by adopting the conventional detectors exploiting the amplitude or amplitude-phase features for the fact that they have the similar phase feature to the main-lobe. To address this issue, we propose a new two-step detector based on point spread function (PSF) feature for Multi-channel SAR-GMTI Radar to eliminate this kind of repetitive detection for a potential target. The effectiveness of the proposed method is validated by the real dual-channel air-borne synthetic aperture radar (SAR) data for ground moving target indication (GMTl).