Prescribed-Time Guidance Law with Approach Angle Constraint and Actuator Faults

In this paper, a prescribed-time guidance law with approach angle constraint in the presence of an actuator fault is proposed. Firstly, a sliding mode manifold with prescribed-time convergence is given to ensure that the state of the system converges to the equilibrium point in the specified time. Then, in order to suppress the distrubance, an adaptive gain based on adaptive control is designed. Subsequntly, a augmentation term based on the Lyapunov method is presented to meet the prescribed-time convergence prpoperty when an actuator fault occurs. The prescribed-time convergence of the proposed guidance laws is proven. Numerical simulation results validate the effectiveness of the proposed prescribed-time guidance framework.