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诱饵的存在性检测是对抗拖曳式有源雷达诱饵干扰的前提,也是决定抗干扰效果的重要因素。当导引头雷达发射多个不同频率的脉冲信号时,在一定的检测处理时长内目标回波信号幅度服从瑞利分布,而诱饵干扰信号则是幅度固定的。基于导引头雷达波束内诱饵存在导致的回波特征变化,通过提取诱饵存在/不存在两种情况下雷达接收回波信号的幅度特征差异以及对应单脉冲比特性变化,推导了两种假设条件下比幅测角扩展单脉冲比的条件概率密度函数,并在此基础上提出了采用Neyman-Pearson准则的广义最大似然比(GLRT)诱饵存在性检测方法以及干扰检测处理流程。不同干扰场景和条件下的仿真实验验证了该检测方法的有效性,能够满足拖曳式诱饵干扰对抗的需求。
The existence detection of bait is the precondition to resist the bait of towed active radar and the important factor that decides the anti-jamming effect. When the seeker radar transmits a plurality of pulse signals of different frequencies, the amplitude of the target echo signal follows the Rayleigh distribution within a certain detection processing duration, and the decoy interfering signal is amplitude fixed. Based on the change of the echo characteristics caused by the presence of decoys in the seeker radar beam, two assumptions were derived by taking into account the differences in the amplitude characteristics of the radar receive echo signals and the corresponding changes in the monopulse characteristics when the decoys were present / absent And the conditional probability density function of monopulse ratio is extended under the amplitude ratio. Based on this, the existence detection method of generalized maximum likelihood ratio (GLRT) bait using Neyman-Pearson criterion and the interference detection processing flow are proposed. Simulation experiments under different interference scenarios and conditions verify the effectiveness of the proposed method and meet the requirements of the towed decoy.