一种带导引头视角和落角约束的导引方法

摘要

In order to meet large impact angle constraint,missile trajectories need to become more curving.However,target may move out of the seeker' s Field-of-View (FOV) during an engagement,thus causing the failure of lock-on.A new guidance law for stationary & moving targets is presented to deal with this problem.A switching term,called Look Angle Restriction Item (LARI) is designed to modify the Impact Angle Control Navigation Guidance (IACNG) Law.The IACNG works throughout the flight time and gives the guarantee of hitting targets at a desire impact angle.The LARI turns on only when the look angle exceeds the predefined threshold to maintain the target always inside of missile seeker' s FOV.The information of relative distance is not needed by the proposed guidance law,and its performance is demonstrated by simulation.The results show that the new method is very effective for look angle restriction while still retaining the advantage of the original guidance law.%针对导弹大落角需求下引起的目标超出导引头视场造成锁定失败的情况,提出了一种采用开关逻辑的导引律.该方法在落角控制导引律的基础上引入了一个开关项,当导引头视角超出设定阈值时开启开关项,通过反向原指令加速度来抑制视角的增大,使目标始终处在导引头视场之内,当导引头视角小于设定阈值时关闭开关项以发挥原导引律的优势.新导引律能有效攻击固定与运动目标,且无需弹目相对距离信息.仿真表明,该导引律既有效地限制了导引头视角,又保留了原导引律高落角精度和指令加速度在末段收敛到零的特性.