Real Time Fault Tolerant Nonlinear Attitude Control System for Nanosatellite Applications
نویسندگان
چکیده
This paper develops a fault tolerant attitude controller for next generation nanosatellites. The proposed fault tolerant attitude control algorithms in this study are based on first order and high order sliding mode control theory as well as fuzzy logic systems to achieve low cost and real time autonomy. A locally asymptotically stable adaptive fuzzy first order sliding mode controller is chosen as the best solution to the local attitude control tracking problem. This novel fault tolerant control is verified in the simulation results with reaction wheels’ Coulomb friction, saturation, noise, dead-zone, bias fault and external disturbances. Simulation and testing results presented in the paper demonstrate that the attitude control system can provide successful pointing and tracking in the presence of system uncertainties for a specified class of reaction wheel failures.
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