Down-Looking Sparse Linear Array 3-D Sar Imaging Based on Motion Compensation

In this paper, we proposed a method based on the minimum entropy principle to compensate the motion error. Since the impact of air disturbance and the flight attitude, there is a motion error of the platform motion. The motion error will cause the imaging defocusing, which will influence the quality of the imaging. Firstly, we established the imaging model of down-looking sparse linear array 3-D SAR imaging with motion error. Then, the impact of motion error is analyzed. A method based on minimum entropy principle is proposed to compensate the motion error. Finally, the cross-track signal reconstruction is finished by the compressed sensing. Experimental results demonstrated the effectiveness of the proposed method.