Adaptive nonsingular fast terminal sliding mode control for spacecraft hovering to noncooperative target

This paper considers the relative position control of the Line-of-Sight (LOS) based relative motion model, which is highly complicated and strongly coupling nonlinear with the matched disturbance. By employing a novel nonsingular fast terminal sliding mode (NFTSM) surface, the adaptive control law is designed to guarantee the bounded stability of the closed-loop error system without prior knowledge of disturbance bound. Finally, the numerical simulation is presented to show fine performance of the proposed control law.