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Internal Model Principles for Observers

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3 Author(s)
Trumpf, J. ; Res. Sch. of Eng., Australian Nat. Univ., Canberra, ACT, Australia ; Trentelman, H.L. ; Willems, J.C.

This paper deals with the observer problem for dynamical systems in a behavioral context. We are given a dynamical system together with a partition of the system variables into a set of known or measured variables and a set of unknown, to be estimated variables. The observer problem is to find a system that produces an estimate of the unknown variables on the basis of the known or measured variables. For a given plant and partition, we establish a characterization of all error behaviors that can be achieved by interconnecting the plant with some observer. The main result of this paper is a very general, behavioral formulation of an internal model principle for observers. We will show that a nonintrusive observer achieves a stable error behavior if and only if, in addition to a detectability condition on the observer, the observer behavior contains the anti-stabilizable part of the plant behavior.

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Automatic Control, IEEE Transactions on  (Volume:59 ,  Issue: 7 )