基于数字射频存储(digital radio frequency memory,DRFM)技术的转发式欺骗干扰与真实雷达回波高度相干,这导致雷达难以分辨真假目标.针对该问题,提出一种基于Hough变换的DRFM欺骗干扰检测方法.建立基于线性调频的干扰信号模型,分析其谐波分量的频谱特性,采用短时傅里叶变换和二维恒虚警率检测器对干扰信号进行特征提取,并利用Hough变换完成欺骗干扰检测.所提方法是基于DRFM欺骗干扰本身的特征,不依赖于先验信息与应用场景,计算复杂度低,且在低信噪比条件下具有良好的检测性能.计算机仿真实验验证了方法的有效性.
Radar deception jamming detection method with digital radio frequency memory
The transponder deception jamming with DRFM(digital radio frequency memory)is highly coherent with real radar echoes,which makes it difficult for radar to distinguish real radar echoes and jamming.To address this issue,a DRFM-based deception jamming detection method based on Hough transform was proposed.The jamming signal model based on linear frequency modulation was established and the spectrum of the jamming harmonics was analyzed subsequently.Then,the short-time Fourier transform and two-dimensional constant false alarm rate detector were used to extract the features of the jamming signal.The Hough transform was used to complete deception jamming detection.The proposed method is based on the characteristics of DRFM deception jamming itself,and does not depend on prior information and application scenario.Moreover,it has low computational complexity and good detection performance under the condition of low signal-to-noise.The effectiveness of the proposed method is verified through simulations.
jamming detectionactive deceptive jammingdigital radio frequency memoryHough transform
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