为开展导引头设计仿真,建立了两框架导引头动力学模型,揭示了导引头隔离度的来源。首先,定义了参考坐标系,依据动力学原理求取了导引头内、外框架动力学方程。其次,结合反馈控制原理,通过方程变换获得了导引头闭环控制框图。最后,进行了导引头隔离特性和耦合特性仿真,验证了模型的正确性。研究结果表明,弹体扰动通过导引头外框架以几何投影及干扰力矩两种形式进入导引头闭环控制回路,这是产生隔离度问题的根源。

In order to carry out the design and simulation of the seeker, the dynamic model of two frame seeker was established, and the source of seeker isolation was revealed. Firstly, the reference coordinate system was defined, and the kinetic equation of inner seeker head and outer frame was derived according to principle of dynamics. Secondly, combined with feedback control theory, the closed loop control block diagram of seeker was obtained through equation transformation. Finally, the isolation and coupling characteristics of seeker were simulated, and the validity of the model was verified. The results showed that the disturbance of the missile body entered into the close loop control circuit of seeker through the outer frame of weeker with two forms, which were geometric projection and disturbance torque, and it was the origin of isolation problem.