基于扩展目标的单脉冲多普勒雷达导引头相干干扰

传统两点源相干干扰是基于质点模型产生与回波相位相干的干扰信号, 相应地用于验证干扰效果的导引头仿真平台往往仅进行功能级仿真.然而, 当被掩护目标为扩展目标时, 利用质点模型无法产生与目标回波相干的信号导致干扰效果下降.针对该问题, 研究了基于扩展目标的相干干扰新方法, 基于被掩护目标电磁散射特性将入射信号与同频点相应姿态角下的目标散射函数进行卷积, 充分保留目标特性对信号相位的调制信息, 从而产生与扩展目标回波具有稳定相位关系的干扰信号.设计了脉冲多普勒(Pulse Doppler, PD)雷达导引头相干视频仿真模型及六自由度弹道模型, 以完成精确的闭环仿真试验评估.试验结果表明, 通过目标距离像特性近似目标散射函数来生成PD导引头相干干扰信号时, 角度诱偏效果相比传统干扰大幅度提高, 方位、俯仰的框架误差角可达到十度的量级.

The coherent jamming approach based on extended target of monopulse PD seeker

The current research on coherent jamming of mono-pulse pulse Doppler(PD) seeker focuses on coherent dual point-sources jamming, which is based on the particle model to produce jamming signal. Accordingly, the simulation system to verify jamming efficiency is simplified to functional simulation. However, when the target under protection is an extended one, the jamming method based on particle model is invalidated. To solve this problem, a novel coherent jamming method based on extended target model is proposed. According to the 3D CAD model of ship targets, the high resolution range profile (HRRP) templates at full azimuth angles are calculated. The jamming signals coherent with echoes are by convolution HRRP templates to radar transmitted signals, which fully preserves target property modulation information on signal phase. In order to evaluate the effect, the PD seeker is discussed in six degree of freedom trajectory simulation of the closed loop (PDRS) for coherent video signal level. Experiment result shows that the proposed method has better angle deception jamming effect which produces the jamming signal by using target range profile to approximate target scattering function. The azimuth and elevation frame angle error can reach up to about ten degree level.