大气层内的动能拦截器末制导段,为了提高对目标未知逃逸机动的鲁棒性,可采用变结构制导律。为了克服变结构制导律容易引起视线转率的颤振问题,提出用反正切函数代替传统变结构制导律中的符号函数的方法,使制导律平滑,从而改善由于符号函数而产生的滑动模态颤振现象。仿真结果表明,经改进的平滑制导律结构简单,易于实现,且具有较高的制导精度。

During the terminal guidance phase of the kinetic kill vehicle in the atmosphere, the variable structure guidance law can be used to improve the robustness to unknown escaping maneuver of the target. Since the variable structure guidance law always leads chattering of line-of-sight angular velocity, the arc tangent function was proposed to replace the sign function in the conventional variable structure guidance law, making the guidance law smooth and thereby the sliding mode chattering cased by the sign function is improved. The simulation results show that this guidance law is simple and easy to apply, and has fine guidance precision.