线性调频脉压信号的旁瓣抑制方法

摘要

For the big range-side-lobe problem of linear frequency modulated(LFM)pulse compression signal,a new method of adding combined window function to suppress side-lobes is proposed.LFM pulse compression sig-nal is added to the window of mixing convolution of rectangular window and Hanning window,then cutting toe technology is used to manipulate the minimum value.For pulse compression signal of small time-bandwidth(TB) product,adding window filter cannot meet the practical requirement of radar,the spectrum modified technique that makes the output spectrum similar to the Kaiser window is applied.Compared with the classical method of adding window filter to suppress side-lobes,testing results show that the ratio of main-lobe to side-lobe can in-crease by 4 to 12 dB in the same time-band-width,which has certain reference significance for improving radar engineering design.%针对线性调频信号脉冲压缩后产生较大距离旁瓣的问题，提出了一种新的组合窗函数的旁瓣抑制方法。将矩形窗与海明窗混合卷积对线性调频脉冲压缩信号进行加窗，再利用切趾技术进行最小值处理；针对小时宽带宽积脉冲压缩信号，加权后，仍不能满足雷达实际工作的要求，采用让输出频谱逼近高性能的凯塞窗的谱修正技术。仿真结果表明，与传统经典加权抑制旁瓣的方法相比，在时宽带宽积相同情况（TB＜100）下，主副瓣比可提高4～12dB，对于雷达工程技术中改进设计具有一定的参考意义。