Global asymptotic regulation control by output feedback for a class of nonlinear systems

This paper considers the global asymptotic regulation control for a class of nonlinear systems with dynamic uncertainties, which satisfies the integral input-to-state stable (iISS) condition. The uncertain vector field not only depends on the system output, but also the unmeasurable inverse system state. By constructing a (n + 1)-order observer, we design a dynamic output feedback controller, which could regulate the system output to any desired constant and meanwhile keep the other signals bounded. We illustrate the proposed control scheme by the mass-spring mechanical system. The simulation results verify the effectiveness of the developed method.