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针对导弹拦截机动目标时要求限制终端攻击角度的问题,提出了一种基于扩张干扰观测器(EDO)的有限时间收敛制导律.考虑拦截时弹目相对运动关系,将导弹速度的时变、未知的运动目标加速度视为扰动,采用EDO对干扰进行实时的观测和补偿.通过引入快速跟踪微分器解决制导律中所需期望视线角速率无法直接获取的问题.同时,在制导律性能分析中引入了滑模捕捉能力的概念,分别对不同攻击场景和不同运动形式的机动目标进行拦截仿真,结果表明该制导律有良好的制导性能和鲁棒性,并与其他的制导律进行仿真对比,其所需过载小,脱靶量小,易于工程实现.
Aiming at the problem of limiting the terminal attack angle when the missile intercepts the maneuvering target, a finite-time convergence guidance law based on the extended disturbance observer (EDO) is proposed. Considering the relative motion of the projectile during the interception, the time-varying and unknown And the EDO is used to observe and compensate the disturbance in real time.A fast tracking differentiator is introduced to solve the problem that the required angular rate of view can not be directly obtained in the guidance law.At the same time, The concept of sliding mode capture capability is used to simulate different attack scenarios and different maneuvering targets respectively. The results show that the guidance law has good guidance performance and robustness, and compared with other guidance laws Small overload required, small off-target, easy to implement.