  This paper studies an attitude control system design based on modified
Rodrigues parameters feedback. It employs a linear continuous sliding mode
controller. The sliding mode controller is able to bring the existence of the
sliding motion asymptotically. Besides, the attitude control system equilibrium
point is proved to have an asymptotic stability guarantee through further
analysis. This stability analysis is conducted since the sliding mode existence
on the designed sliding surface does not imply the stability guarantee of the
system's equilibrium. This paper ends with some numerical examples that confirm
the effectiveness of the designed attitude control system.
