噪声调频信号对宽带线性调频雷达的干扰机理

研究了噪声调频信号中调制噪声方差及带宽的选择对宽带线性调频匹配滤波器的影响。通过观察噪声调频信号通过线性调频匹配滤波器之后的时域输出包络,分析了其起伏特性,推导出了在最大包络起伏指标下的调制噪声最优带宽应该为发射线性调频信号的时宽的倒数量级。同时,通过误差分析表明:要在实际中达到此干扰最优带宽,对侦察接收机的指标要求无需过高。

Jamming Mechanism of Noise Frequency-modulated Signal against Wide Band FM Radar

In this paper,for the first time,the impact of the noise frequency-modulated signal to a wide band linear fre- quency modulation matched filter is studied for different modulation noise variance and bandwidth.Through observation and analy- sis in time-domain of the output envelope fluctuation characteristic of the matched filter,the optimal bandwidth for the modulation noise under the maximum enveloping fluctuation target is derived.Meanwhile,error analysis showed that:in practice,the recon- naissance receiver can make the jammer achieve this optimal bandwidth without excessive demands on it.