The design of finite-time convergence guidance law for head pursuit based on adaptive sliding mode control

The high-speed target interception plays a vital role in the modern industry with many application scenarios. Due to the difficulties of direct interception in high speed, the head pursuit intercept is frequently considered for the target of re-entering flight vehicle. In this paper, a novel terminal sliding mode control method is proposed for the interception of high-speed maneuvering target, in which the finite convergence guidance law is initially designed under the constraint of intercept angle. By introducing the mathematical model of correlative motion between interceptor and target, the sliding surface is researched and designed to meet the critical conditions of head pursuit intercepting. Meanwhile, considering the dynamic characteristics of both interceptor and target, an adaptive guidance law is therefore proposed to compensate the modelling errors, which goal is to improve the accuracy of interception. The stability analysis is theoretically proved in terms of the Lyapunov method. Numerical simulations are presented to validate the robustness and effectiveness of the proposed guidance law, by which good intercepting performance can be supported.