Finite?time attitude stabilization of rigid spacecrafts based on control Lyapunov functions

In this paper, the control Lyapunov function (CLF) approach is adopted to investigate finite-time attitude of rigid spacecraft subject parameter uncertainty and external disturbance. By using an extended state observer estimate disturbance, a CLF controller proposed for stabilization system. The designed includes two parts. first part classical based controller, which ensure globally asymptotical stability nominal second one sliding mode used convergence performance advantage that states system can converge into small neighourhood zero in finite time, simultaneously given index be minimized. practical resulted closed-loop proven via theory. Finally, simulation results illustrate effectiveness developed controller.