Distributed finite-time attitude regulation for multiple rigid spacecraft via bounded control

The problem of finite-time attitude regulation for multiple rigid spacecraft with leader-follower architecture is studied. The desired attitude for spacecraft formation is represented by the attitude of a leader. A distributed finite-time convergent observer is first proposed to estimate the leader's attitude in a finite time. By using the technique of finite-time saturation control, a bounded finite-time attitude controller is designed to track the estimated attitude and then the leader's attitude in a finite time. A simulation example is finally given.