基于滑模干扰观测器的垂直攻击末制导律研究

Research on Vertical Impact Terminal Guidance Law Based on Sliding Mode Disturbance Observer

针对导弹高精度、垂直打击地面目标的任务要求,将滑模干扰观测器和比例导引律相结合,提出了一种满足多约束条件的鲁棒性末制导方法。综合考虑落点、落角等约束条件,给出了纵向平面和侧向平面的比例导引系数的选取原则。为了弥补比例导引的不足,提高制导系统的鲁棒性,基于滑模干扰观测器对不确定性进行了估计,确保了系统对导引指令的精确跟踪。该制导方法不需测距信息,也无需对剩余飞行时间进行估算。仿真结果表明,本文提出的制导方法具有较高的精度和较强的鲁棒性。

The problem of terminal precision guidance for missiles with vertical attack angle constraint is considered.A sliding mode disturbance observer and enhanced adaptive proportional guidance law are applied to improve the robustness.Considering the constraints of target location and attack angle,the guidance parameters selections in longitudinal and lateral planes are analyzed.The uncertainties of the dynamics are estimated by using a second-order sliding mode disturbance observer,and then compensated to ensure high accuracy in the realization of guidance commands.Simulation results demonstrate the robustness and accuracy of the proposed approach.Compared with the conventional adaptive proportional guidance approach,the guidance precision of proposed approach is obviously improved in the present of aerodynamic dispersions.