Interference Modeling of Two Point Source Retrodirective Cross-eye Considering Target Echo
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摘要:
单脉冲雷达广泛用于导弹末制导以对飞机、舰船目标实施精确打击。针对单脉冲雷达抗干扰性强的特点，该文采用交叉眼对单脉冲雷达进行干扰，在考虑交叉眼的反向天线结构下，基于雷达方程、单脉冲雷达测角原理，以比相单脉冲雷达为干扰对象，对隔离目标回波和考虑目标回波下的两点源反向交叉眼干扰进行建模，基于线性拟合的分析方法得到了两点源反向交叉眼参数与单脉冲雷达指示角的一般性公式。并通过案例仿真探讨了干扰机功率、信号相位差、信号幅值比及目标回波相位等参数对单脉冲雷达角度欺骗效果的影响。结果表明：干扰机发射的两路信号相位差越接近180°，幅值比越接近1，干扰机对单脉冲雷达角度欺骗效果越好；在JSR(干信比)为10～25 dB之间时，随着干扰机功率的增大，相同干扰效果下干扰机参数容限越宽松；受目标回波相位变化影响，两点源交叉眼干扰效果不稳定；数学模型与单脉冲雷达接收机仿真模型结果一致。该文研究可为飞机、舰船搭载反向交叉眼干扰机设计提供参考。
Abstract:In view of the strong anti-jamming capability of monopulse radar, the cross eye is used to interfere with monopulse radar. Monopulse radar is widely used in missile terminal guidance for precise attack on aircraft and ship targets. Based on the radar equation and the principle of monopulse radar angle measurement, the retrodirective cross-eye interference of the isolated target and the two point source under the target echo are modeled. Based on the analysis method of linear fitting, the general formula of two source reverse cross eye parameters and monopulse radar indicating angle are obtained. The influence of jammer power, signal phase difference, signal amplitude ratio and echo signal phase on the angle deception effect of monopulse radar is discussed through case simulation. The results show that: The phase difference of the two signals emitted by the jammer is closer to 180° and the amplitude ratio is closer to 1, the better the angle deception effect of the jammer is to the monopulse radar; with the increase of jammer power, the parameter tolerance of jammers is more relaxed when JSR (10～25 dB) is increased; and due to the influence of target echeo phase, the jamming effect of jammer is unstable; the mathematical model is consistent with the simulation model of monopulse radar receiver. This study can provide reference for the design of reverse cross eye jammers for aircraft and ships.
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