Abstract
In this paper, we propose an observer for a satellite that estimates the angular speed vector from the attitude of the satellite. Since the estimation error dynamics of the observer have two equilibrium points, we add a statejump rule to the observer to avoid an unstable equilibrium point. This hybrid observer is globally asymptotically stable and locally exponentially stable. Moreover, we obtain conditions under which a comprehensive nonlinear control system composed of a globally stabilizing state feedback law and the proposed observer is globally asymptotically stable.
