Satellite Attitude Control with a Modified Iterative Learning Law for the Decrease in the Effectiveness of the Actuator

• Published in: International journal of aeronautical and space sciences Vol. 11; no. 2; pp. 87 - 97
• Main Authors: Lee, Ho-Jin, Kim, You-Dan, Kim, Hee-Seob
• Format: Journal Article
• Language: Korean
• Published: 2010
• Subjects: Decrease in effectiveness of the actuator; Lyapunov stability analysis; Satellite attitude control; Fault tolerant control scheme; Iterative learning law
• ISSN: 2093-274X; 2093-2480

A fault tolerant satellite attitude control scheme with a modified iterative learning law is proposed for dealing with actuator faults. The actuator fault is modeled to reflect the degradation of actuation effectiveness, and the solar array-induced disturbance is considered as an external disturbance. To estimate the magnitudes of the actuator fault and the external disturbance, a modified iterative learning law using only the information associated with the state error is applied. Stability analysis is performed to obtain the gain matrices of the modified iterative learning law using the Lyapunov theorem. The proposed fault tolerant control scheme is applied to the rest-to-rest maneuver of a large satellite system, and numerical simulations are performed to verify the performance of the proposed scheme.