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针对目标大机动情况下制导准确性较差的问题,研究了基于滑模干扰观测器的空空导弹三维预测制导律。利用连续时间非线性预测控制方法,根据导弹当前的状态,选择弹道跟踪误差作为预测性能指标,对其进行在线滚动优化,获得制导指令。同时为了进一步提高导弹制导规律的抗干扰能力,利用滑模干扰观测器对内部不确定性和外部未知干扰进行逼近,并与预测控制方法所得到的制导指令进行综合得到优化制导指令。最后仿真结果表明,所设计的PCG相比于传统的PN,性能有较大的改善,能够实现目标大机动情况下的精确制导,并且所需导弹机动过载小、脱靶量小,具有一定的鲁棒性。
Aiming at the poor guidance accuracy under large maneuvering targets, a three-dimensional predictive guidance law of air-to-air missile based on sliding mode disturbance observer is studied. Using the continuous time nonlinear predictive control method, ballistic tracking error is selected as the predictive performance index according to the current state of the missile and the rolling optimization is performed on-line to obtain the guidance instruction. At the same time, in order to further improve the anti-jamming capability of the missile guidance law, the sliding mode disturbance observer is used to approximate the internal uncertainty and the external unknown disturbance, and the guidance orders are obtained by combining the predictive control method with the optimized guidance instructions. The simulation results show that compared with the traditional PN, the designed PCG has better performance and can realize the precise guidance in the case of large maneuvering target, and the required missile maneuvering overloading is small, the miss distance is small, Great.