Abstract: In view of the problem of chattering when sliding mode approaches are implemented for tracking control of hypersonic aircraft during reentry, a tracking control method based on multi slide mode controller fusion is proposed in this paper. The method first describes the hypersonic vehicle reentry process using a kinetic model, and establishes the angle of attack, side slip angle, and tilt angle tracking control equations. Then the quasi second order continuous sliding mode controller and super spiral sliding mode controller are combined to realize the tracking control in stages and respectively weaken the influence of shaking vibration, which helps to improve the tracking control performance during reentry. The paper verifies the effectiveness and feasibility of the proposed tracking control method through model simulation and shows that the control method can not only realize the track tracking of hypersonic aircraft, but also improve the performance of control torque response and attitude angle speed tracking error integration, which can effectively inhibit the chattering and improve the flight stability.

Key words: hypersonic aircraft, trajectory tracking control, multi sliding mode, chattering