Reduced Attitude Control Method for Satellites with Pointing Constraints and Disturbance

In this paper, the attitude control problem of satellites with dynamic pointing constraints, angular velocity constraints and disturbance is studied. Firstly, the attitude kinematics and dynamic pointing constraints are based on the reduced attitude description. Since the reduced attitude contains only two degrees of freedom, singularity and redundancy description are avoided. The artificial potential function is introduced to ensure that the satellite attitude meets the requirement of dynamic pointing constraints. At the same time, the barrier Lyapunov function is introduced to ensure that the angular velocity constraints are not violated during the maneuver process. The disturbance observer is used to estimate the disturbance torque, which enhances the system's ability to suppress the external disturbance. Stability analysis shows that the proposed control law ensures the asymptotic convergence of the system. Finally, the effectiveness of the proposed control method is verified by numerical simulation.