半主动导引头倒置接收机建模仿真研究

Modeling and Simulation of Semi-Active Radar Seeker Inverted Receiver

数字仿真技术已广泛应用在制导控制系统的设计中。目前导引头接收机的输出雷达误差信号只用比例系数K来代替,但是在低信噪比、超低空和群目标条件下,导引头雷达误差测量受到干扰,比例系数K无法反映实际情况,影响了结果的置信度,也限制了数字仿真的应用。本文旨在完善导引头接收机的数学模型,使之能够真实地模拟实际情况。本文以Matlab中的Simulink为仿真平台,建立了导引头接收机的数学模型,主要包括:一二中混频、三通道合一、AGC归一化比幅单脉冲测角以及AFC回路等模块。接收机最终输出为控制导弹所需的雷达误差(即视线角速率)和弹目多普勒频率。最后进行数字仿真,仿真结果与飞行试验结果一致,验证了所提导引头接收机数学模型的可靠性。

Digital simulation technology of guidance and control system has been widely used in the design of guidance and control system.The output radar error signal of seeker receiver is only replaced currently by a proportional coefficient K.Under the conditions of low signal-to-noise ratio,ultra-low altitude and group targets,the seeker radar error is interfered.The coefficient K cannot reflect the actual situation,which affects the confidence of the results and also limits the application of digital simulation.The purpose of this paper is to refine the mathematical model of the seeker receiver,so that it can simulate the actual situation.In this model,Simulink in Matlab is used to model seeker receiver,including one-two-middle mixing,three-channel integration,AGC normalized amplitude ratio single-pulse angle measurement and the AFC loop.The receiver finally outputs the radar error(that is,the line of sight angular rate)and the Doppler frequency of the projectile required to control the missile.Finally,the receiver model is added to the guidance and control system for overall simulation,and the simulation result is consistent with the conclusions obtained from the actual test,which proves that the proposed mathematical model of seeker receiver is effective.