基于宽带模糊函数的步进频雷达成像特性分析

频率步进雷达回波脉冲序列时宽-带宽积很大，因此当目标沿雷达视线高速运动时，采用Woodward窄带模糊函数不能准确描述高分辨成像的特性。为此，首先分析频率步进雷达运动目标的回波模型，然后推导频率步进信号的宽带模糊函数，最后通过宽带模糊函数的几个特殊切面分析频率步进雷达高速目标成像在时延域与多普勒域的特性，并通过仿真与窄带模糊函数进行对比。

Imaging characteristic analysis of SFR by wideband ambiguity function

Returned bursts of the stepped frequency radar (SFR) have a very large time bandwidth product. Consequently, the Woodward narrowband ambiguity function is incapable of describing accurately the characteristics of high-range-resolution images of high-speed targets moving along the line-of-sight of radar. Hence, the echo models of SFR are firstly analyzed, and the wideband ambiguity function (WBAF) of stepped-frequency signals is deduced. Finally, the imaging characteristics of high-speed-target in both time delay domain and Doppler-shift domain are analyzed through special cuts of the WBAF as well as compared with the narrowband ambiguity function by simulation.