Finite Time Sliding Mode Controller for a Rigid Satellite in Presence of Actuator Failure

Attitude control executes an important role in satellite performance and is one of the most critical implement in the development of spacecraft technology. Complicated satellite system, especially in the harsh space environment, causes several uncertainties and undesirable torques. According to the presence of these disturbances, taking advantage of developed anti-disturbance control methods is beneficial. This paper presents some nonlinear sliding mode control scheme for a satellite with various reaction wheel faults as uncertain parameters. Attitude quaternion and its derivative commands are robustly tracked via sliding mode controllers to become inclined to zero.