This paper presents the attitude tracking of a class of satellite control systems under external disturbances. Once the error dynamics of the satellite are obtained, a nonlinear transformation expresses them in a suitable representation for the design of a high-gain observer and backstepping control. The observer-based backstepping controller is then designed to drive the angles of the satellite dynamics to their desired values in the presence of exogenous disturbances. Closed-loop stability of the proposed controller is demonstrated via Lyapunov theory, and its effectiveness is confirmed through numerical simulations.
In this paper an observer-based controller is developed for continuous-time spacecraft attitude control system. Firstly, a high gain observer is created for the system model. Then, the estimated states are used to generate a backstepping controller to regulate the performance of sate variables to the desired states. Then, the nonlinear closed loop control system is simulated to demonstrate the effectiveness of the developed control approach in regulating the performance of the system to the desired steady state.
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