基于LFM波形的极化雷达移频干扰鉴别

发布时间：2018-01-14 13:09

本文关键词：基于LFM波形的极化雷达移频干扰鉴别　出处：《中国电子科学研究院学报》2017年01期 　论文类型：期刊论文

【摘要】：基于数字射频存储器(Digital Ratio Frequency Memory,DRFM)的移频干扰是一种常见的针对线性调频(Linear Frequency Modulated,LFM)脉冲雷达系统的欺骗式干扰。由于LFM脉冲信号的模糊函数具有距离-多普勒耦合的特点,经移频处理后的干扰信号会对雷达接收系统产生距离欺骗的效果,常规雷达对抗移频干扰面临很多困难。该文研究了基于正负调频的LFM波形进行移频干扰鉴别的方法。通过全极化雷达的信号处理,真实目标和移频干扰会表现出差异,该文在正负调频LFM信号处理的基础上,构造了能够表现目标散射矩阵和干扰极化状态差异的特征量,该特征可以用于目标的真假鉴别。该文在给出鉴别量推导过程的同时,利用仿真数据对所提出的针对移频干扰的目标鉴别方法进行了验证,实验结果表明新的极化鉴别方法可以有效区分目标和移频干扰。
[Abstract]:Digital Ratio Frequency Memory based on digital RF memory. DRFM) is a common linear Frequency Modulated for linear frequency modulation (LFM). Deception jamming in LFM pulse radar system. The ambiguity function of LFM pulse signal has the characteristics of range-Doppler coupling. The jamming signal after frequency shift processing will produce range deception effect on the radar receiving system. There are many difficulties for conventional radar to counter frequency shift jamming. In this paper, the method of frequency shift jamming identification based on LFM waveform with positive and negative frequency modulation is studied, and the signal processing of fully polarized radar is carried out. There are differences between real target and frequency shift interference. Based on the processing of positive and negative frequency modulated LFM signals, the characteristic quantities which can represent the target scattering matrix and the difference of interference polarization state are constructed in this paper. This feature can be used to identify the true and false target. In this paper, the derivation process of discriminant is given, and the proposed method is verified by simulation data. The experimental results show that the new polarization discrimination method can effectively distinguish the target from the frequency-shift interference.
【作者单位】：北京航空航天大学电子信息工程学院;国睿科技有限公司;
【分类号】：TN974
【正文快照】： 0引言 1极化雷达接收信号模型欺骗式电子干扰是针对雷达系统有源干扰的重要形式之-,它能够产生大量假目标或扰乱雷达的1·1目标参数测量[K,近年来学术界提出了很多对抗 LFM信号在雷达应用中十分广泛,在脉冲持续欺骗式干扰的算法[4’5],然而基于数字射频存储器时间内幅度恒定

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