Reference : Iterative observer-based state and parameter estimation for linear systems
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Mathematics
Iterative observer-based state and parameter estimation for linear systems
Aalto, Atte mailto [Inria > Saclay Île-de-France research center > > ; Ecole Polytechnique (France) > Solid Mechanics Laboratory]
ESAIM: Control, Optimisation and Calculus of Variations
EDP Sciences
[en] Parameter estimation ; system identification ; back and forth nudging ; output error minimization
[en] We propose an iterative method for joint state and parameter estimation using measurements on a time interval [0,T] for systems that are backward output stabilizable. Since this time interval is fixed, errors in initial state may have a big impact on the parameter estimate. We propose to use the back and forth nudging (BFN) method for estimating the system’s initial state and a Gauss–Newton step between BFN iterations for estimating the system parameters. Taking advantage of results on the optimality of the BFN method, we show that for systems with skew-adjoint generators, the initial state and parameter estimate minimizing an output error cost functional is an attractive fixed point for the proposed method. We treat both linear source estimation and bilinear parameter estimation problems.
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