In order to improve the guiding accuracy in intercepting the hypersonic vehicle, this article presents a finite-time guidance law based on the observer and head-pursuit theory. First, based on a two-dimensional model between the interceptor and target, this study applies the fast power reaching law to head-pursuit guidance law so that it can alleviate the chattering phenomenon and ensure the convergence speed. Second, target maneuvers are considered as system disturbances, and the head-pursuit guidance law based on an observer is proposed. Furthermore, this method is extended to a three-dimensional case. Finally, comparative simulation results further verify the superiority of the guidance laws designed in this article.

为了提高拦截高超声速飞行器的制导精度，本文提出了一种基于观察者和头部追踪理论的有限时制导律。首先，基于拦截器与目标之间的二维模型，本研究将快速到达功率定律应用于头部追踪制导律，从而减轻了颤振现象并确保了收敛速度。其次，将目标机动视为系统扰动，并提出了基于观察者的头部追击制导律。此外，该方法扩展到三维情况。最后，比较仿真结果进一步验证了本文设计的制导律的优越性。