基于模糊滑模的激光导引头伺服控制系统仿真分析

Simulation and analysis of laser seeker servo control system based on fuzzy sliding model control

激光导引头为激光制导武器提供目标的位置信息,是导弹实现对目标可靠打击的主要依赖对象。导弹在飞行过程中,弹体扰动会通过多种方式耦合到导引头的伺服稳定系统中,从而影响视轴的稳定,降低对目标跟踪的准确性。文中简单分析了导引头伺服系统的基本结构及其实现视轴稳定的基本原理,针对导引头的扰动问题,提出了一种模糊滑模控制方法,利用滑模变结构控制具有对扰动'完全自适应'的优点,结合模糊控制以降低滑模变结构控制的抖振作用,从而提高导引头伺服稳定系统的鲁棒性和导引头的隔离度。仿真结果表明:与PID控制相比,模糊滑模控制能够提高系统的控制品质,达到较好的控制精度和响应速度。

The laser seeker,which is the main dependent object of the missile to achieve reliable target attack,provides the position information of the target for the laser-guided weapon.During the missile flight,the missile′s disturbance was coupled to the servo stabilization system of the seeker in various ways.This will affect the stability of the visual axis as well as reducing the accuracy of the seeker in locating the target.The basic structure of the seeker servo system and the basic principle of achieving the stability of the visual axis were analyzed in this paper.In order to solve the disturbance problem of the seeker,a Fuzzy Sliding Mode Control(FSMC)method was proposed.The Sliding Mode Control(SMC)has the advantage of'fully adaptive'to the disturbances.Besides,it was combined with fuzzy control,which can reduce chattering of SMC.In this way,the robustness of the seeker servo system was improved by FSMC,so did the isolation of the seeker.The simulation results show that compared with PID control,fuzzy sliding mode control can improve the control quality of the system and achieve better control accuracy and response speed.