一种线性调频信号超低旁瓣脉冲压缩方法

摘要

雷达脉冲压缩希望具有超低距离旁瓣的特征,线性调频信号采用加窗方式可达到约-35 dB的距离旁瓣电平.基于超低旁瓣电平信号设计方法,在不考虑信噪比损失条件下,提出了一种新的超低旁瓣的脉冲压缩方法,基本思想是针对给定线性调频信号,频率滤波权值采用超低频旁瓣频域信号与线性调频信号频域的比值,可以将接收端旁瓣电平输出最低到-120 dB.同时,从理论上和数值结果中分析了信噪比损失、延迟敏感性等问题.%A radar system desires low range sidelobes and Linear Frequency Modulated(LFM) waveforms can reach a-35 dB Peak Sidelobe Level(PSL) with a window in range compression. Based on a waveform design method for extraordinarily-low range sidelobes and ignorant of signal-to-noise ratio(SNR) loss, this paper proposes a novel range compression method for extraordinarily-low range sidelobes. The concept is to use a range compression weight as the ratio of the frequency domain signal to the LFM frequency do-main,yielding a -120dB sidelobe output. The SNR loss and sensitivity to delay are also analyzed accord-ing to theory and numerical simulations.