论文针对 SAR 雷达测试需求，对 SAR 雷达回波模拟系统的构建方法进行了分析，并对关键技术进行了深入研究，以数字高程图（DEM ）为基准源，并采用距离时域相干法进行目标回波的仿真；应用 DSP ＋ FPGA 阵列实现目标回波系统函数的实时计算；对雷达发射信号和目标回波系统函数进行傅里叶变换后，进行卷积和数字正交混频，实现回波信号的相关性模拟。论文所提出的方法，可实现 SAR 成像雷达较大场景目标回波模拟，并可有效提高目标回波模拟的实时性。%Aimed to the requirement of the SAR radar testing ,the construction method of SAR Radar target echo simu‐lation system is analyzed ,and the key technology is researched deeply .The target echo is simulated by using the coherence method of distance time domain based on standard source .The target echo system functionrealizes real‐time calculating by u‐sing DSP + FPGA array .The echo signal correlation simulation is realized by convolved and digital quadrature down‐convert after radar transmit signal and target echo system function in Fourier transform .The simulation of the large scene of SAR imaging radar is realized ,and the real‐time performance of target echo simulation is improved effectively .
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