机载拖曳式诱饵会对单脉冲雷达形成双点源干扰。以振幅和差单脉冲雷达导引头为对象, 研究了目标检测过程中单脉冲比的分布特性和检测模型。首先分析了雷达导引头主波束内接收信号的特点, 给出了目标检测时接收信号单脉冲比实部和虚部的分布特征; 然后针对双点源干扰时单脉冲比实部和虚部的变化, 分别提出了基于奈曼皮尔逊准则的广义似然比检测方法和虚部门限检测方法。因为单一的检测方法所包含的目标信息有限, 为提高检测性能, 提出了广义似然比检测与虚部门限检测相结合的检测模型, 该模型充分利用了单脉冲比的实部与虚部信息。最后, 对该方法的检测流程和检测性能进行分析, 仿真结果表明, 该方法能够获得更高的检测概率以及更低的虚警概率。

Airborne towed decoy may form dual-source interference to monopulse radar. The distribution characteristics of monopulse ratio and detecting model of monopulse radar seeker were studied. The feature of receipt signal in main-beam of radar seeker was analyzed, and the distribution characteristics of monopulse ratio's real part and imaginary part were presented. Then considering the change of monopulse ratio's real parts and imaginary parts, the Generalized Likelihood Ratio Test(GLRT) and Imaginary part test based on Neyman-Pearson criterion were put forward respectively. Since the single detecting method contains limited information, a new detecting model was put forward for improving detecting probability, which combined the GLRT with imaginary part test. The model could made full use of information of monopulse ratio's real part and imaginary part. The results of analysis and the simulation showed that the new method can provide higher detecting probability and lower false alarm rate.