关键词: 编队航天器, 预定时间控制, 执行器饱和, 非奇异滑模, 姿态协同控制

Abstract: This paper investigates the attitude coordination control problem for spacecraft formation flying system with external disturbance and actuator saturation constraints, and proposes a distributed saturated predefined-time control strategy based on non-singular sliding mode. First, by employing predefined-time control theory, a distributed non-singular predefined-time sliding mode surface is constructed, which guarantees that the attitude errors of spacecraft formation can converge to a small neighborhood of zero within a predefined time. Then, combining the proposed sliding mode surface with a designed auxiliary system, a distributed saturated predefined-time attitude coordination controller is developed, which ensures the sliding mode surface converges to a bounded region near zero within the predefined time. Finally, rigorous theoretical analysis and numerical simulation results fully demonstrate the effectiveness of the proposed control strategy. It can achieve high-precision and predefined-time convergent attitude coordination control, with strong robustness to external disturbance and explicit consideration of actuator saturation, thus providing a high-performance control scheme for practical spacecraft formation flying applications.

Key words: formation spacecraft, predefined-time control, actuator saturation, nonsingular sliding mode, attitude coordination control