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Stable adaptive observers for nonlinear time-varying systems

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2 Author(s)
Bastin, G. ; Dept. of Syst. Eng., Australian Nat. Univ., Canberra, ACT, Australia ; Gevers, M.R.

An adaptive observer/identifier for single input/single output observable nonlinear systems that can be transformed to a certain observable canonical form is described. Sufficient conditions for stability of this observer are provided. These conditions are in terms of the structure of the system and canonical form, the boundedness of the parameter variations, and the sufficient richness of some signals. The scope of the canonical form and the use of the observer/identifier is motivated by the presentation of applications to time-invariant bilinear systems, nonlinear systems in phase-variable form a biotechnological process, and a robot manipulator. In each case, the specific stability conditions are presented

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Automatic Control, IEEE Transactions on  (Volume:33 ,  Issue: 7 )