|Distributed Global Velocity-free Attitude Coordination Control for Multiple Spacecraft without Unwinding
Zhihao Zhu*, Zhi Gao, and Yu Guo
International Journal of Control, Automation, and Systems, vol. 20, no. 2, pp.411-420, 2022
Abstract : The distributed global velocity-free attitude coordination control problem for multiple formation spacecraft without unwinding phenomenon and with disturbance is investigated in this paper. Initially, a fixed-time observer is constructed to estimate the states of the virtual leader in fixed time. For the formation spacecraft with attitude-only measurements, a filter system is developed. To estimate the disturbance, a fixed-time extended state observer is proposed. With the application of the fixed-time observers and the filter system, a distributed global velocity-free attitude coordination controller is designed to grantee that the leader with time-varying trajectory can be tracked coordinately by the formation spacecraft, where the unwinding problem of the spacecraft can be avoided. In addition, a distributed velocity-free attitude coordination controller on the basis of the fixed-time extended state observer is designed to compensate the effect of the lump disturbance. Finally, the effectiveness of the proposed controller is demonstrated by numerical simulation.
Distributed global control, filter system, fixed-time observer, unwinding phenomenon, velocity-free attitude coordination.
Download PDF : Click this link