单脉冲雷达导引头质心干扰检测方法

箔条质心干扰是反舰导弹末制导跟踪阶段面临的主要无源干扰样式,对箔条干扰进行检测可以为抗箔条干扰的策略使用提供时机参考。该文在将舰船目标和箔条干扰分别建模为Swerling IV型和Swerling II型目标的基础上,建立单脉冲雷达导引头接收机回波信号模型,通过理论分析和对比,箔条质心干扰条件下的单脉冲雷达导引头接收机输出信号可以近似为高斯分布,采用广义似然比检验方法实现了波束内不可分辨的箔条干扰检测。综合考虑虚警概率,脉冲积累数、目标到达方向、目标与干扰的功率比等因素进行了仿真实验,结果表明该检测算法是有效的。

A Detection Method of Centroid Jamming in Monopulse Radar Seeker

Chaff centroid jamming is one of the major passive jamming techniques against anti-ship missile in the terminal guidance phase,and its detection can help choose one′s occasion to perform countermeasures.Echoes in monopulse radar seeker receiver were generated by modeling ship and chaff as swerling IV and swerling II,respectively.It was showed by theoretical analysis and comparison that echoes under centroid jamming were with the approximated Gaussian distribution,and on this foundation a generalized likelihood ratio test(GLRT) algorithm was proposed for centroid jamming detection in beamwidth.This detection algorithm was validated by simulation,which had taken into the consideration of several important factors,as false alarm probability,pulse accumulation number,direction-of-arrival and signal-to-jamming power ratio,and their impact upon detection performance were also examined.