耦合扰动下空间翻滚目标的接触消旋输出反馈控制

Output Feedback Control of Contact Detumbling for Tumbling Targets in Space under Coupling Disturbance

面向基于柔性毛刷的空间翻滚目标接触式消旋任务,研究了未知快时变、强耦合扰动下的服务航天器鲁棒控制问题。首先,建立了服务航天器、消旋刷和目标卫星组成的消旋系统动力学模型,并提出了一种基于最小距离准则的接触检测算法,实现了毛刷和目标帆板接触点的精确检测。在此基础上,采用有限时间扩张状态观测器实时估计耦合扰动和航天器状态,并将其与终端滑模控制技术结合,设计了一种无速度信息的鲁棒输出反馈控制策略,保证服务航天器姿态稳定和位置追踪的有限时间稳定。将其应用至航天器消旋系统中,仿真结果验证了所提策略的有效性和鲁棒性。

The robust control problem of service spacecraft under unknown fast time-varying strong coupling disturbances is studied for the flexible-brush-based detumbling mission of space tumbling target.Firstly,a dynamic model of the detumbling system consisting of service spacecraft,brush,and target satellite is established.A contact detection algorithm based on the minimum distance criterion is proposed to achieve accurate detection of the contact points between the brush and the target panels.On this basis,the finite time extended state observer is used to estimate the coupling disturbance and spacecraft state in real time.This observer is combined with terminal sliding mode control technology to design a robust output feedback control strategy,which cannot depend on velocities information to ensure the finite time convergence for attitude stabilization and position tracking of the service spacecraft.It is applied to the detumbling system,and the simulation results verify the effectiveness and robustness of the proposed strategy.