Generalized predictive tracking control of spacecraft attitude based on hyperbolic tangent extended state observer

This paper studies the attitude tracking control problem of the rigid spacecraft with parametric uncertainties and unknown bounded disturbances. Firstly, an ideal generalized predictive controller (GPC) containing unknown items is constructed, which can optimize the receding horizon performance index and ensure the optimal performance of the closed-loop system. Afterward, in an attempt to estimate and compensate the lump model uncertainties, an extended state observer is proposed by using the hyperbolic tangent function. Meanwhile, the explicit tuning rules for observer parameters are derived on account of the stability analysis. And then, it is fully proved in Lyapunov framework that all closed-loop signals invariably keep bounded and the attitude tracking error ultimately converges to a little neighborhood of zero. Lastly, the simulation results show the high efficiency and precision of the proposed control method.