Non-singular terminal sliding mode controller for spacecraft attitude stabilization

In this paper, the finite-time attitude control problem for rigid spacecraft with external disturbance is addressed. First, a problem of existing non-singular terminal sliding mode is raised, and then we design a non-singular finite-time attitude controller by using a special Lyapunov function with a power integrator form, which enables the system states converge to a residual set in a finite time. Further, an adaptive non-singular terminal sliding mode controller is proposed to deal with the external disturbance. Numerical simulations are performed to illustrate the effectiveness of the proposed control schemes with fast convergence, high accuracy and good disturbance rejection property in the spacecraft control system.