DATA-DRIVEN MODEL-FREE ADAPTIVE SLIDING MODE ATTITUDE CONTROL OF COMBINED SPACECRAFT

In this paper, a data-driven model-free adaptive sliding mode attitude control (MFASMC) method is proposed for the combined spacecraft in the presence of unknown mathematical model. First, a model-free adaptive controller (MFAC) is designed for the attitude control of combined spacecraft. Second, a sliding-mode-based supplementary controller is introduced to improve the tracking performance of MFAC in terms of robustness. Compared with the existing works, the designed control scheme only utilizes the attitude angle and attitude angular velocity of the combined spacecraft and no mechanism model of combined spacecraft is required. It dramatically decreases the complexity and difficulty of the relevant controller design. Finally, simulation comparison between the MFASMC and MFAC is given to verify the effectiveness of the proposed control method.