Circular SAR Trajectory Reconstruction Based on Phase Gradient of Calibrators
Guo Zhen-yu①②③ Lin Yun①② Hong Wen①② Tan Wei-xian①② Wang Yan-ping①②
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China) ③(University of Chinese Academy of Sciences, Beijing 100049, China)
Circular SAR (CSAR) high resolution imaging requires a more accurate and stable Inertial Navigation System (INS), therefore motion compensation is one of the key technologies. In this paper, the phase error caused by trajectory measurement error is firstly analyzed. Then, the CSAR trajectory reconstruction algorithm based on the extraction of calibrators’ phase gradient is proposed. This algorithm is aiming at the spatial variant property of phase errors. The azimuth differential phase of each calibrator is extracted from SAR echo data. The high precision CSAR trajectory is reconstructed via trilateration in combination with multiple calibrators’ phase gradient. The high quality CSAR image is formed with this trajectory. The proposed algorithm solves the problem of image defocusing by trajectory measurement error, meanwhile the entire scene gets focused efficiently. The simulation results verify the correctness and effectiveness of the proposed algorithm.
郭振宇,林赟,洪 文,谭维贤,王彦平. 基于定标器相位梯度提取的圆迹SAR轨迹重建方法[J]. 电子与信息学报, 2015, 37(8): 1836-1842.
Guo Zhen-yu, Lin Yun, Hong Wen, Tan Wei-xian, Wang Yan-ping. Circular SAR Trajectory Reconstruction Based on Phase Gradient of Calibrators. JEIT, 2015, 37(8): 1836-1842.
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