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随机噪声连续波体制的合成孔径雷达(SAR)是一个低成本,低截获特性,高电磁兼容性能的遥感成像设备。本文研究了随机噪声调频连续波SAR时间域重构算法,提出了两种后向投影成像算法。首先分析随机噪声连续波体制SAR雷达天线的连续运动造成接收信号的畸变,然后利用基于泰勒展开的近似表达式来表示由连续运动引起的相位项,并给出基于走停近似的后向投影算法和改进的后向投影成像算法。最后,通过点目标仿真实验,验证了走停近似后向投影算法的局限性和改进的后向投影算法的有效性。
Synthetic aperture radar (SAR) with random noise CW system is a remote sensing imaging device with low cost, low interception characteristics and high electromagnetic compatibility. In this paper, the algorithm of time domain reconstruction of random noise FM continuous-wave SAR is studied and two backward projection imaging algorithms are proposed. Firstly, the continuous signal is distorted by the continuous motion of SAR radar antenna, and then the phase term caused by continuous motion is expressed by the approximate expression based on Taylor expansion, and the backward projection algorithm based on walk-stop approximation And improved backward projection imaging algorithm. Finally, through the point-target simulation, we verify the limitations of the approximate backward projection algorithm and the improved backward projection algorithm.