- Volume 11 Issue 2
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Satellite Attitude Control with a Modified Iterative Learning Law for the Decrease in the Effectiveness of the Actuator
Lee, Ho-Jin;Kim, You-Dan;Kim, Hee-Seob
- Received : 2010.01.11
- Accepted : 2010.02.15
- Published : 2010.06.15
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.
Fault tolerant control scheme;Satellite attitude control;Decrease in effectiveness of the actuator;Iterative learning law;Lyapunov stability analysis
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Supported by : Korea Aerospace Research Institute (KARI)