论文部分内容阅读
多次移频干扰是一种有效的对抗线性调频(LFM)脉冲压缩雷达的相干干扰样式,应用于自卫式干扰时,能够形成多个超前和滞后分布的假目标。提出利用盲源分离(BSS)的方法来分离回波和干扰信号,并通过频率补偿实现对干扰的抑制。首先分析了利用正交极化辅助天线扩展接收通道的可行性,其次建立了通道扩展后的雷达接收信号模型,讨论了回波与干扰信号的可分离性,最后研究了基于最大信噪比盲源分离和频率补偿的干扰抑制方法,并讨论了干扰机附加噪声对抗干扰效果的影响。仿真结果表明本文提出的方法在干信比为20 d B时,仍可以有效地从回波和干扰混叠信号中提取出目标回波信号,从而实现对主瓣移频干扰的对抗。
Multi-frequency interference is an effective coherent interference pattern to combat linear frequency modulation (LFM) pulse compression radar. When used in self-defense interference, it can form multiple pseudo-targets with leading and lagging distributions. Proposed the use of blind source separation (BSS) method to separate the echo and interference signals, and through the frequency compensation to achieve the interference suppression. Firstly, the feasibility of extending the receive channel with orthogonal polarizations is analyzed. Secondly, a channel-extended radar receive signal model is established, and the separability between the echo and the interference signal is discussed. Finally, blind Source separation and frequency compensation of the interference suppression method, and discusses the jammer additional noise on the interference effect. The simulation results show that the method proposed in this paper can effectively extract the target echo signal from the echo and interference aliasing signal when the D / B ratio is 20 dB, so as to achieve the countermeasure to the mainlobe frequency shift interference.