Integral-type sliding mode finite-time fault tolerant control for spacecraft attitude control

This paper addresses the problem of integral-type sliding mode robust fault tolerant control for spacecraft, in the presence of actuator failures and external disturbances simultaneously, achieving the finite-time attitude stabilization. As a stepping stone, a simple saturated nominal controller is firstly designed using homogeneous system theory, to ensure finite-time attitude stabilization of spacecraft without failures and disturbances. Then, utilizing integral-type sliding mode and adaptive techniques, a novel finite-time robust fault tolerant control strategy is developed to compensate for actuators failures and external disturbances. And also, the chattering problem has been restrained via a gain adjusting law. Finally, numerical simulation results are presented to illustrate and highlight the fine performance benefits obtained using the proposed scheme, especially for the faster and higher-precise attitude stabilization.