A New Method of Downward-looking 3D-SAR Based on Compressed Sensing

Downward-looking 3-D Synthetic Aperture Radar (SAR) can be used for three-dimensional reconstruction of the targets in the inferior of the platform of the SAR, and it has wide application prospects. An imaging method of downward-looking 3-D SAR is proposed, which is in the case of the thinned arrays, and this method reduces effectively the antenna elements. In order to suppress the sidelobe brought by thinned arrays, the Compressed Sensing (CS) theory is used in the proposed method. This paper also analysis how distribution of the sparse arrays influences the sparse signal processing and the feasibility of using the compressed sensing theory in 3-D SAR imaging. The simulation results validate the correctness of the analysis and the effectiveness of the proposed algorithm.