介绍了低截获概率(LPI)信号的截获原理。以线性调频连续波信号作为所要研究的LPI信号，讨论了利用多通道数字去斜技术实现对LPI信号截获的具体方法；针对多种可能情况进行了多通道数字去斜算法仿真，并从实验结果中分析了通道对LPI信号的失配和相位不同步对系统检测性能的影响；最后对基于上述多通道数字截获技术的LPI信号特征参数估计方法进行了总结。仿真结果表明采用上述数字去斜方法可以有效地从噪声背景中提取出LPI信号。

In this paper the theory of LPI radar signal interception is introduced and a method using multi-channel digital deramping is discussed in detail for FMCW signals. Many simulation experiments on the method have been done in several possible situations. On basis of them, the influences of mismatch factor and unsynchronized phase on the detection performance of the digital LPI radar detector are analyzed. Finally a method of estimating the parameters of LPI signal is summarized. It is demonstrated that the LPI radar signal can be extracted from the noise background by means of digital deramping.

TN958