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		Ramzi Ben MESSAOUD,Mekki KSOURI.[en_title][J].Control Theory and Technology,2013,11(3):517~520.[Copy]

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RamziBenMESSAOUD,MekkiKSOURI
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(Department of Electrical Engineering, National Engineering School of Tunis)

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Received:May 28, 2012Revised:September 14, 2012

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Local nonlinear unknown input observer

Ramzi Ben MESSAOUD,Mekki KSOURI

(Department of Electrical Engineering, National Engineering School of Tunis)

Abstract:

This paper proposes a new nonlinear unknown input observer. The observer design approach utilizes the first order Taylor expansion. The observer gains are then obtained by a systematic method. In this paper, we added some improvements to this method. The developed approach also can enable observer design for a large class of differentiable nonlinear systems. The necessary and sufficient conditions for the existence of the observer are given. A numerical example is given to illustrate the attractiveness and the simplicity of the new design procedure.

Key words: Unknown inputs observers Stability Nonlinear systems Robust and state estimation