A Novel Moving Target Detection Method for Hybrid Quad-Pol SAR

The other dimension information of polarimetric synthetic aperture radar (SAR) provides the possibility for ground moving target indication (GMTI). The moving target detection method for traditional quadrature-polarimetric (Quad-Pol) has been proposed, and the effectiveness has also been verified. But this method is not suitable for the hybrid Quad-Pol SAR system. In this letter, we proposes a novel moving target detection method for hybrid SAR. First, transform the scattering matrix measured from hybrid Quad-Pol SAR to obtain the synthesized cross polarization (cross-pol) images, which has the azimuth ambiguity of odd-order copol channels. Then, according to the reciprocity theorem, clutter suppression can be implemented by combining the synthesized cross-pol images. What’s more, because the energy of copol channels is stronger than that of the cross-pol channels, the proposed method has better effect than the traditional method. Simulations demonstrate the effectiveness of the proposed method.