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Iterative observer-based state and parameter estimation for linear systems

Atte Aalto 1 
1 M3DISIM - Mathematical and Mechanical Modeling with Data Interaction in Simulations for Medicine
LMS - Laboratoire de mécanique des solides, Inria Saclay - Ile de France
Abstract : 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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Submitted on : Thursday, September 22, 2016 - 3:04:33 PM
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Atte Aalto. Iterative observer-based state and parameter estimation for linear systems. ESAIM: Control, Optimisation and Calculus of Variations, EDP Sciences, 2018, 24 (1), pp.265-288. ⟨10.1051/cocv/2017005⟩. ⟨hal-01370430⟩



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