旁瓣抑制对线性调频脉冲移频干扰的影响

摘要

Sidelobe Suppression (SS) can be found on almost every Linear Frequency Modulated (LFM) pulse radar receiver;Shift-Frequency Jamming (SFJ) is an important method to realize deception jamming using the inherent coupling property between time-delay and frequency-shift of this LFM signal. So, the Inter-Ambiguity Function (IAF) of LFM with SS using normalized parameters including time-delay rate and shift-frequency rate is analyzed. Then the 3:1 cone than weighted, Hamming weighted and cosine square weighted are focused and some parameters related to detection are analyzed. Compared with the none SS, the weighted shift-frequency signal to Jamming loss and the weighted shift-frequency jamming to noise loss are present like M function having the max shift-frequency rate point equal to ± 0.29. And the impact of weighted shift-frequency pulse-width loss are decide by none shift-frequency.%　　旁瓣抑制是线性调频脉压雷达接收机的重要组成部分，而移频干扰是运用线性调频信号时延和频移的耦合特性，实现欺骗干扰的重要方法.对此，该文运用频偏比和时延比描述了旁瓣抑制下线性调频信号的互模糊函数的归一化表达式.并在此基础上，重点分析了3：1锥比加权、海明加权、余弦平方加权3类常见旁瓣抑制对移频干扰的影响，与无加权相比，其与检测相关的加权频偏信干比损失和加权频偏干噪比损失呈现M函数特征，峰值出现在频偏比取值为±0.29时；而对加权频偏脉宽比的影响，往往取决于无频偏时与无加权情况下的比值.