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由于双曲线调频(hyperbolic frequency-modulation,HFM)信号具备良好的Doppler不变性,比线性调频信号更有利于高速运动目标的探测和成像。但是对于复杂电大尺寸目标,直接采用高频电磁散射理论生成宽带回波计算量非常庞大。为研究HFM信号在宽带雷达成像中的应用,该文提出一种利用目标静态电磁计算数据的HFM信号回波快速生成方法,通过相位匹配滤波和频域降采样有效地降低了计算复杂度,并详细分析了目标高速运动对HFM信号匹配滤波的影响。该方法同时适用于线性调频信号的宽带回波仿真。仿真结果验证了该方法的正确性和有效性。
Due to its good Doppler invariance, hyperbolic frequency-modulation (HFM) signals are more conducive to the detection and imaging of high-speed moving targets than the chirp signals. However, for the large size of complex electric targets, the use of high-frequency electromagnetic scattering theory to generate broadband echo calculation is very large. In order to study the application of HFM signal in wideband radar imaging, this paper presents a fast generation method of HFM signal echo using target static electromagnetic calculation data, which effectively reduces the computational complexity through phase matching filtering and frequency-domain down-sampling The effect of target high-speed motion on HFM signal matching filtering is analyzed in detail. The method is suitable for simulating broadband echo of LFM signal at the same time. The simulation results verify the correctness and validity of the method.