Event-Triggered Integrated Robust Control for Non-Cooperative Fly-Around Mission With Prescribed Performance

Abstract

This paper investigates the event-triggered integrated attitude and position robust control problem for non-cooperative fly-around mission with prescribed performance in the presence of uncertain dynamics and external disturbances. For the requirement of line-of-sight orientation, a coupled motion model of relative position and attitude of the spacecraft is established, where the relative orbit model is described in the line-of-slight frame. Based upon the prescribed performance functions and the model error transformation, an integrated robust adaptive controller is proposed such that the desired fly-around trajectory and attitude orientation can be tracked simultaneously. Moreover, an event-triggered condition is also designed, such that the number of control input updates can be reduced. By means of the constructed event-triggered condition, the closed-loop system still possesses the predetermined control performance, and Zeno phenomenon can be avoided. Simulation results are presented to verify the effectiveness of the proposed controller. INDEX TERMS event-triggered, prescribed performance , non-cooperative spacecraft, fly-around mission, integrated attitude and position.