基于相位重构的LFM信号间歇采样干扰产生方法研究

Research on intermittent sampling jamming generation method of LFM signal based on phase reconstruction

目前,对线性调频信号采用间歇采样干扰样式是电子自卫干扰的常用方法。由于收发延迟,干扰主峰落后于目标回波,但间歇采样可以获取超前于主峰信号的次峰目标。在线性调频斜率较小时,次峰目标甚至可以超前于被保护目标,但线性调频斜率较大时,次峰距离主峰近,效果难以得到保证。提出一种新方法,该方法基于相位信息通过对相位的线性拟合重构信号实现了信号的近似复原,使得主峰相对于回波的延迟被消除,且保持了良好的相参特性。

At present,using intermittent sampling jamming is a common way to electronic self-defence jam⁃ming for the LFM signal.Due to transceiver delay,the jamming main peak is behind the target echo,but intermit⁃tent sampling obtains the secondary peak target which is ahead of the main peak signal.When the linear slope is small,the secondary peak can even be ahead of the protected target,but when the linear frequency modulation is large,the secondary peak is close to the main peak,and the effect is difficult to be guaranteed.A new method is proposed,which is based on the phase information and the linear fitting of the reconstrucued signal to realize the approximate recovery of the signal,so that the delay of the main peak relative to the echo is eliminated,and the good phase-coherent characteristics are maintained.