Finite-time fault tolerant control for spacecraft attitude systems based adding a power integrator approach

Abstract

In this paper, a new fault tolerant controller based on adding a power integrator technique is proposed for spacecraft attitude control system in actuator multiple fault case. Firstly, the kinematic and dynamic equations of the spacecraft attitude control system with actuator faults are given by quaternion. Secondly, considering the external disturbance and the uncertainty of rotation inertia matrix simultaneously, a novel fault tolerant controller combining adaptive law is designed to make the trajectories of the spacecraft control system converge to a small neighborhood of the equilibrium in finite time. Meanwhile, the finite-time convergence is analyzed by using Lyapunov approach. Finally, simulation results are given to demonstrate the effectiveness of the developed fault tolerant control system.