A NOTE ON PRACTICAL OUTPUT TRACKING FOR A CLASS OF UNCERTAIN HIGH ORDER NONLINEAR SYSTEMS

Abstract

This paper considers the problem of global practical tracking via output feedback control for a class of more general uncertain high-order nonlinear systems. By introducing sign function and necessarily modifying the homogeneous domination approach and under a weaker growth condition, this paper proposes a new control scheme to achieve the global practical tracking. It is shown that the designedcontroller guarantees that the state of the resulting closed-loop system is globally bounded and the tracking error converges to a prescribed arbitrarily small neighborhood of the origin after a finite time.