A novel active fault-tolerant control for spacecrafts with full state constraints and input saturation

This paper proposes an active fault-tolerant control (AFTC) system for spacecrafts subject to model uncertainty, external disturbance and actuator fault simultaneously. Fault diagnosis is implemented by a robust fault observer with a simple structure. The observer can separately estimate the fault in the existence of disturbance and uncertainty. The influence on observation performance from disturbance and uncertainty is attenuated by linear matrix inequality (LMI) optimization. For the fault-tolerant controller, asymmetric barrier Lyapunov function and backstepping method are used to constrain all the states. Meanwhile, the control input is restricted by a saturation function. Validation and comparative simulations are implemented to demonstrate the proposed AFTC method. (C) 2020 Published by Elsevier Masson SAS.

Automated summary

This paper introduces an active fault-tolerant control system for spacecrafts, utilizing a robust fault observer for fault diagnosis, LMI optimization to attenuate disturbance and uncertainty, asymmetric barrier Lyapunov function and backstepping method to constrain all states, and a saturation function to restrict control input. Validation and comparative simulations demonstrate the effectiveness of the proposed AFTC method.