穿墙成像雷达旁瓣/栅瓣抑制方法

提出了一种超宽带超稀疏阵列穿墙成像雷达距离向旁瓣和方位向栅瓣抑制的新方法。对于使用步进频连续波的超宽带雷达,其距离向旁瓣较高,通常采用加窗进行抑制。对于超稀疏阵列,其方位向栅瓣较高,可以采用相位相干因子(PCF)加权进行抑制。若同时抑制距离向旁瓣和方位向栅瓣,可以对加窗的图像作PCF加权。但是,距离向加窗会抬高方位向栅瓣,进而降低PCF抑制方位向栅瓣的效果。针对这个问题,提出一种PCF结合双切趾的方法,能够同时有效地抑制距离向旁瓣和方位向栅瓣。仿真和实验结果验证了方法的有效性。

A Sidelobes/Grating Lobes Suppression Method for Through-the-Wall Imaging Radar

This paper introduces a novel range sidelobes and azimuth grating lobes suppression method for ultrawidehand ultrasparse array through-the-wall imaging radar. For ultrawideband radar transmitting stepped frequency continuous wave, the sidelobes in the range profile are high, which can usually be reduced by windowing. For ultrasparse array, azimuth grating lobes are strong, which may be suppressed by phase coherence factor（PCF）. If both range sidelobes and azimuth grating lobes are to be reduced, one may weigh the windowed image by PCF. Whereas, range windowing raises azimuth grating lobes, depressing the effect of PCF. To solve this problem, a method of PCF combined with dual apodization is proposed, which can suppress both range sidelobes and azimuth grating lobes efficiently. Simulation and experiment results dem- onstrate the validity of the proposed method.