Near minimum-time feedback attitude control with multiple saturation constraints for agile satellites

• Published in: Chinese journal of aeronautics 2016-06, Vol.29 (3), p.722-737
• Main Authors: Liu, Xiangdong, Xin, Xing, Li, Zhen, Chen, Zhen, Sheng, Yongzhi
• Format: Article
• Language: English
• Subjects: Actuator saturation; Attitude control; Control systems; Controllers; Feedback control; Identification; Maneuvers; Momentum transfer; Satellite attitude control; Satellites; Saturation; Strategy; 卫星姿态控制系统; 反馈控制器; 反馈控制律; 姿态机动; 快速动态响应; 最小时间; 自适应控制策略; 饱和特性
• ISSN: 1000-9361
• DOI: 10.1016/j.cja.2016.04.011

Agile satellites are of importance in modern aerospace applications, but high mobility of the satellites may cause them vulnerable to saturation during attitude maneuvers due to limited rating of actuators, This paper proposes a near minimum-time feedback control law for the agile satellite attitude control system. The feedback controller is formed by specially designed cascaded sub-units. The rapid dynamic response of the modified Bang Bang control logic achieves the near optimal property and ensures the non-saturation properties on three-axis. To improve the dynamic performance, a model reference control strategy is proposed, in which the oniline near optimal attitude maneuver path is generated by the cascade controller and is then tracked by a nonlinear back-stepping controller. Furthermore, the accuracy and the robustness of the control system are achieved by momentum-based on-line inertial identification. The rapid attitude maneuvering can be applied for tasks including the move to move case. Numerical simulations are conducted to verify the effectiveness of the proposed control strategy in terms of the saturation-free property and rapidness.