Appointed-time safety-guaranteed control for spacecraft flying around non-cooperative target based on fully actuated system theory

Abstract

Oriented to the control problem of the spacecraft flying around the non-cooperative target, an appointed-time safety-guaranteed control method based on the fully actuated system theory is proposed considering the effects of external disturbances and undesired orbital manoeuvres of the non-cooperative target. First, the relative motion dynamics model is established based on the Line-of-sight (LOS) frame and then transformed into the fully actuated form to reduce the complexity of controller design. Furthermore, an appointed-time safety-guaranteed controller is designed to guarantee the appointed-time convergence and flight safety of the fly-around system. Finally, the effectiveness and robustness of the designed control method are verified by three groups of fly-around simulations.