一种线性调频连续波探测抗欺骗式干扰方法

An Anti-deception Jamming Method for LFMCW Detector

针对用于亚音速弹载探测的毫米波线性调频连续波(LFMCW)探测体制,采用射频存储转发技术,提出一种基于高分辨率一维距离像(HRRP)并结合线性调频Z变换(CZT)频谱细化算法以及动态时间弯曲(DTW)匹配算法的抗欺骗式干扰方法。分析了LFMCW探测体制下多散射中心目标回波模型以及基于数字射频存储技术(DRFM)的干扰信号模型;在常规恒虚警(CFAR)检测基础上,利用CZT获取目标信号细化频谱,提取出目标HRRP特征,并采用DTW进行特征匹配,对真实目标与干扰目标进行区分。仿真及实验结果表明,对采用毫米波LFMCW体制探测的亚音速弹载探测器,所提的CZT-DTW联合检测方法能够有效区分真实目标与采用DRFM的干扰目标。

An anti-radio frequency storage and repeater jamming method is proposed for the millimeter wave linear frequency modulation continuous wave (LFMCW) detection system for subsonic bomb detection, which is based on high-resolution range profile, chirp Z transform (CZT) spectrum zooming algorithm and dynamic time warping (DTW) matching algorithm. The multi scattering center target echo model and the jamming signal model based on the digital radio frequency memory (DRFM) are analyzed in the LFMCW detection system. On the basis of the constant false-alarm rate detection, the target signal spectrum is zoomed by CZT, and the feature of target HRRP is extracted. DTW matching algorithm is used to distinguish between the real target and the jamming target. The simulated and experimental results show that the obstructions detection method based on CZT and DTW can effectively distinguish between the real target and the jamming target based on DRFM for subsonic bomb-borne millimeter wave LFMCW detector.