Safety-Guaranteed Control for Fly-Around with Noncooperative Space Target via a Fully-Actuated System Approach

A safety-guaranteed control method based on fully-actuated system theory is proposed in this work for a service spacecraft flying around a noncooperative target with undesired orbital maneuvers. Firstly, the fly-around relative motion dynamic equations are established and transformed into a fully-actuated system form. An initial control law is then designed on basis of the fully-actuated system theory. To continue, a nonlinear manifold is constructed and constrained by the appointed-time performance functions to prescribe the control performance, and an intermediate control law is proposed to realize the fly-around objectives. Finally, a group of numerical simulation are organized to verify the feasibility of the proposed method and its robustness against undesired orbital maneuvers.