Semi-global finite-time observers for nonlinear systems

Authors:
Yanjun Shen;Xiaohua Xia
Affiliations:
Institute of Nonlinear Complex Systems, China Three Gorges University, Yichang, Hubei, 443002, China;Department of Electrical, Electronic and Computer Engineering, University of Pretoria, South Africa
Venue:
Automatica (Journal of IFAC)
Year:
2008

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Abstract

It is well known that high gain observers exist for single output nonlinear systems that are uniformly observable and globally Lipschitzian. Under the same conditions, we show that these systems admit semi-global and finite-time converging observers. This is achieved with a derivation of a new sufficient condition for local finite-time stability, in conjunction with applications of geometric homogeneity and Lyapunov theories.