DLSLA 3D SAR Motion Error Compensation and Imaging Method Based on Parameter Estimation
Liu Qiyong① Zhang Qun②③④* Hong Wen⑤⑥ Su Linghua②③ Liang Jia②③
①(Air Force Engineering University Graduate College, Xi'an 710077, China) ②(College of Information and Navigation, Air Force Engineering University, Xi'an 710077, China) ③(Collaborative Innovation Center of Information Sensing and Understanding, Xi'an 710077, China) ④(The Key Laboratory for Information Science of Electromagnetic Waves (Ministry of Education), Fudan University, Shanghai 200433, China) ⑤(National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China) ⑥(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
摘要 当载机存在偏航角速度时，载机航线会偏离理想航线，对稀疏阵列下视3维合成孔径雷达（DLSLA 3D SAR）成像产生影响。该文建立了载机在飞行过程中存在偏航角速度下的DLSLA 3D SAR成像模型，通过理论推导得到了信号的多普勒调频率表达式，多普勒调频率与目标被调制后的跨航向坐标有关，而与被调制后的方位向坐标无关。进一步，完成跨航向信号处理之后，在平台的速度和偏航角速度不准的情况下，利用参数化稀疏表征方法实现了平台的速度和偏航角速度的估计，并完成了方位向稀疏场景的重构，最后提出了一种形变校正方法。仿真实验验证了该算法的有效性。
Abstract：In the presence of yaw angular velocity, a body will deviate from its ideal flight path, which will affect imaging of Downward-Looking Sparse Linear Array 3D Synthetic Aperture Radar (DLSLA 3D SAR). In this paper, an imaging model including yaw rate is established. Furthermore, Doppler frequency modulation, which is related to cross-track coordinates and not azimuth coordinates, was theoretically calculated. Thus, a cross-track signal could be reconstructed to obtain the cross-track coordinates before azimuth signal compression. Based on the parametric sparse representation, the velocity and yaw rate of the platform were estimated, and the azimuth signal was compressed. Moreover, a deformation correction method is proposed to correct image deformation. The simulation results demonstrate the validity of the proposed method.
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Liu Qiyong, Zhang Qun, Hong Wen, Su Linghua, Liang Jia. DLSLA 3D SAR Motion Error Compensation and Imaging Method Based on Parameter Estimation. JOURNAL OF RADARS, 2018, 7(6): 730-739.
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2018, Vol. 7 
