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Input output linearization approach to state observer design for nonlinear system

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2 Author(s)
Jo, N.H. ; Dept. of Electr. Eng., Seoul Nat. Univ., South Korea ; Seo, J.H.

Presents a state observer for a class of nonlinear systems based on the input output linearization. While the previous result presented state observers for nonlinear systems of full relative degree, we proposed a procedure fur the design of nonlinear state observers which do not require the hypothesis of full relative degree. Assuming that there exists a global state observer for internal dynamics and that some functions are globally Lipschitz, we can design a globally convergent state observer. It is also shown that if the zero dynamics are locally exponentially stable, then there exists a local state observer. An example is given to illustrate the proposed design of nonlinear state observers

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Automatic Control, IEEE Transactions on  (Volume:45 ,  Issue: 12 )