Multivariable super-twisting sliding mode approach for attitude tracking of spacecraft

In this paper, a continuous finite-time tracking control algorithm for spacecraft in the presence of external disturbances is presented. The control law is based on a recently developed multivariable super-twisting sliding mode (MSTSM) approach. A strong Lyapunov function is used to guarantee the finite-time closed-loop stability. One of the main features of the proposed controller is that it is continuous and chattering free. Numerical simulations are given to demonstrate the performance of the developed control scheme.