大气层内拦截弹采样系统H∞混合灵敏度设计

研究采用姿控式直接侧向力/气动力复合控制方式的大气层内拦截弹的过载跟踪控制器设计问题.舵系统和导弹运动都可以视作连续量,由脉冲发动机提供的直接侧向力可以视作离散控制量,因此基于混合控制的概念,当舵系统的控制器设计完毕后,整个系统就可以视作采样控制系统,从而可以采用采样系统的方法进行系统分析和设计.采用采样系统的H_∞混合灵敏度方法设计直接侧向力的离散控制器,以快速建立攻角来跟踪过载指令.数值仿真验证了设计方法的有效性.

H-infinity mixed sensitivity design for sampled-data system of endoatmospheric interceptors

The overload tracking control system of an endoatmospheric interceptor is designed,in which the interceptor's attitude is controlled by the combination of lateral jet thrusters and aerodynamic surfaces.The elevators' and the interceptor' motions are viewed as continuous variables,while the lateral thrust provided by impulse thrusters is treated as a discrete control variable.Then,based on the hybrid control concept,the whole system can be regarded as a sampled-data system after the elevators' controllers have been designed.Then control methods for sampled-data system can be used to the system synthesis and design.The H-infinity mixed sensitivity method for sampled-data systems is employed to design a discrete controller for the lateral thrust to achieve fast response of angle-of-attack for overload tracking.Numerical simulation shows the effectiveness of the proposed approach.