带落角约束的再入机动弹头的变结构导引律

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.

Variable structure guidance law of reentry maneuvering warhead with terminal angular constraint

According to the problem that perpendicular impact on the target was required for reentry maneuvering warhead,the variable structure guidance law with terminal angular constraint was derived,which comprised diving-plane guidance equation and turning-plane guidance equation.Chattering Reduction was achieved on the basis of quasi-sliding mode control.Through computer simulation,the influence of the four guidance law parameters on the guidance performance was analyzed.Then the feasibility of off-line optimization on guidance law parameters by genetic algorithm was discussed and the effect of guidance law with optimal parameters was tested under the conditions of different initial state bias.Simulation results show that compared with optimal guidance law,the variable structure guidance law is more robust which can still hold the guidance precision even when disturbance exists.