A dual-observer design for global output feedback stabilization of nonlinear systems with low-order and high-order nonlinearities

This paper employs a dual-observer design to solve the problem of global Output feedback stabilization for a class of nonlinear systems whose nonlinearities are bounded by both low-order and high-order terms. We show that the dual-observer comprised of two individual homogeneous observers, can be implemented together to estimate low-order and high-order states in parallel. The proposed dual observer, together with a static. feedback controller, which has both low-order and high-order terms, will lead to a new result combining and generalizing two recent results (Li J, Qian C. Proceedings of the 2005 IEEE Conference on Decision and Control, 2005; 2652-2657) and (Qian C. Proceedings of the 2005 American Control Conference, June 2005; 4708-4715). Copyright (C) 2008 John Wiley & Sons, Ltd.