一种有视线角约束的模糊变系数变结构制导律

A Fuzzy Variable Coefficient Variable Structure Guidance Law with Terminal Line-of-Sight Angle Constraint

针对有末端视线角约束下拦截高速机动目标的场景,设计了一种模糊变系数变结构制导律。提出了一种自适应变结构制导律,制导律可以根据弹目距离自适应调整趋近滑模面的速度;用饱和函数代替制导律中的开关项,有效消除了系统抖振。仿真表明,拦截高速非机动和高速机动目标,提出的变结构制导律均可以满足视线角约束和脱靶量要求,但需用过载较大。为解决需用过载较大的问题,引入模糊控制方法,设计模糊控制器对变结构制导律中的导引系数进行优化,得到了一种模糊变系数变结构制导律,可以满足视线角约束且有效抑制了系统的需用过载。

A fuzzy variable coefficient variable structure guidance law is designed for intercepting highspeed maneuvering targets with terminal line-of-sight angle constraints.Firstly,an adaptive variable structure guidance law is proposed to adaptively adjust the velocity approaching the sliding mode surface according to the distance of the missile target.Then,the chattering is eliminated by replacing the switch term in guidance law with the saturation function.Simulation results show that the proposed guidance law can meet the requirements of line-of-sight angle constraint and miss distance for intercepting high-speed non-maneuvering and maneuvering targets,but it requires a large overload.To this end,a fuzzy control method is introduced and a fuzzy controller is designed to optimize the guidance coefficient in the variable structure guidance law.Finally,a fuzzy variable structure guidance law with a variable coefficient is obtained to satisfy the line-of-sight angle constraint and restrain the required system overload.