对线性调频信号雷达的噪声干扰方法研究

Research on Noise Jamming to LFM Signal Radar

为了提高雷达抗干扰能力,线性调频信号雷达通常利用脉冲压缩技术,具有较强的抗常规压制噪声干扰的能力,为了有效干扰上述雷达,提出了两种噪声干扰技术,即干扰机将侦收的雷达发射信号与窄带噪声在时域进行相乘处理或卷积处理,再经干扰机功率放大后辐射的两种干扰方法。上述两种干扰方法均不需要测频和频率引导就能自动瞄准雷达信号频率,并可利用雷达脉冲压缩处理时的处理增益,降低了对干扰机发射功率的要求,较传统宽带压制噪声干扰的方法有明显优势。通过理论推导,仿真分析和试验验证,表明上述两种干扰方法对线性调频信号雷达均有显著的干扰效果。

Linear frequency modulation（LFM） signal radar always uses pulse compression technology,which has strong ability to suppress convention noise interference. In order to counter such radar effectively, two narrowband noise jamming realization methods are proposed in this paper. With these methods, the radar signal reseived and stored by jammer and noise signal are multiplied or convolved to get the noise jamming. Then the noise jamming is magnified and transmitted. These two methods donot need to spy frequency or frequency channel off. They can aim at radar＇s frequency automatically and improve the utility of jamming power. The two methods have obvious advantages to traditional broadband noise suppression method~ In this paper, through theoretical derivation, simulation analysis and test,it shows that these two kinds of interference method have significant effects to LFM signal radar.