Active Fault-Tolerant Control for Spacecraft with Actuator and Sensor Faults

In this paper, a novel active fault-tolerant control (AFTC) is proposed for the spacecraft attitude control system (ACS) with internal and external uncertainties and actuator sensor faults. Firstly, a robust strong tracking cubature Kalman filter (RST-SCKF) for the closed-loop system fault diagnosis is proposed to detect the unknown actuator fault time and obtain its estimated value under sensor fault condition. Next, a fault-tolerant controller based on non-singular terminal sliding mode control (NTSMC) is designed using the fault estimation information to ensure the finite-time stability of the attitude control system in the presence of the actuator and sensor faults. Numerical simulation shows the excellent performance of the proposed method.