Design of an Active Fault-Tolerant Control System with transducer Faults for attitude control of rigid Spacecraft

Abstract

Instability and a reduction in control performance are mostly caused by faults and failures in components of the system. In order to increase the control system's tolerance against faults and failures, fault-tolerant control (FTC) techniques have been developed recently. This thesis investigates an active FTC for rigid spacecraft attitude control subject to transducer faults, parameter uncertainty and external disturbance. The designed fault detection observer is capable of detecting the transducer fault without false alarms brought on by outside disturbances, model uncertainties, and the designed fault estimation is to estimate the overall effects of the fault and system states. Introduces an auxiliary variable that uses an indirect fault identification approach in order to estimate accurately and reduce the effect of faults or failures.