针对小型战术导弹以一定角度攻击目标的问题,文中提出了一种基于观测器的有限时间收敛制导律。利用非齐次干扰观测器对系统未知扰动进行估计,避免了制导律可能带来的抖振问题,采用幂次自适应趋近律,使得视线角及视线角速度在该制导律下能够快速的收敛至期望值,同时满足脱靶量和攻击角度约束要求,相比于传统制导律,具有一定的优越性。数值仿真结果表明了该方法的有效性。

In order to solve the problem that small tactical missile attacked targets at a certain angle, a finite time convergent guidance law based on observer was proposed in this paper. The nonhomogeneous disturbance observer was employed to estimate the unknown disturbance of the system, which avoid the chattering that may caused by guidance law. A power adaptive reaching law was applied to make the LOS and LOS speed converge to the expected value rapidly, at the same time, it met the requirements of miss distance and attack angle constraint. Compared with the traditional guidance law, it has some advantages. And the numerical simulation results demonstrate the effectiveness of the proposed method.