OBSERVER-BASED FINITE TIME CONTROL FOR PROXIMITY TO TARGET SPACECRAFT

The finite time control for proximity to target spacecraft is investigated in this paper. The relative motion dynamics for the chaser spacecraft and target spacecraft is firstly proposed. Then a finite time controller, based on a novel fast terminal sliding mode approach, is designed to achieve above control objective. The stability and convergence of the closed-loop system with the property of finite time are discussed by Lyapunov method. The escape maneuver of target spacecraft is further considered, and an observer-based modified finite time controller is proposed to deal with this problem. Numerical simulations are finally provided to illustrate the performance of the proposed controllers.