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针对再入机动弹头垂直打击目标的要求,研究了具有末端落角约束的变结构导引律。该导引律包括俯冲平面内的制导方程和转弯平面内的制导方程,通过采用准滑动模态控制削弱抖振的影响。通过数学仿真,分析了四个制导参数对制导效果的影响,探讨了利用遗传算法离线优化制导参数的可行性,检验了最优制导参数的制导效果对不同初始状态偏差的敏感性。仿真结果表明,与最优导引律相比,变结构导引律具有较强的鲁棒性,在干扰影响下仍能保持较高的制导精度。
In order to meet the requirements of the target of reentry maneuver warhead vertical strike, the variable structure guidance law with terminal falling angle constraints is studied. The guidance law includes the governing equations in the subducting plane and the governing equations in the turning plane, and the effect of buffeting is reduced by using the quasi-sliding mode control. The effects of four guidance parameters on guidance effectiveness are analyzed through mathematical simulation. The feasibility of using genetic algorithm to optimize guidance parameters off-line is also discussed. The sensitivity of optimal guidance guidance to different initial states is also tested. The simulation results show that compared with the optimal guidance law, the variable structure guidance law has strong robustness and can maintain high guidance accuracy under the influence of interference.