Adaptive Chatter-Free Non-Singular Fast Terminal Sliding Mode Attitude Control for Rigid Spacecraft

This paper proposes an adaptive, chatter-free, non-singular fast terminal sliding mode (CNFTSM) control method to solve the fixed-time attitude tracking problem of rigid spacecraft with inertial uncertainty and external disturbances. To ensure the system state converges to the origin within a fixed time, a new fixed-time sliding surface is designed to solve the fixed-time attitude tracking problem, and an adaptive law is introduced to ensure the robustness of trajectory tracking. Finally, simulation results verify the effectiveness of the proposed control strategy.