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Revisiting Hammerstein System Identification through the Two-Stage Algorithm for Bilinear Parameter Estimation
Peking University, China.
INRIA, France.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
2009 (English)In: Automatica, ISSN 0005-1098, E-ISSN 1873-2836, Vol. 45, no 11, 2627-2633 p.Article in journal (Refereed) Published
Abstract [en]

The Two-Stage Algorithm (TSA) has been extensively used and adapted for the identification of Hammerstein systems. It is essentially based on a particular formulation of Hammerstein systems in the form of bilinearly parameterized linear regressions. This paper has been motivated by a somewhat contradictory fact: though the optimality of the TSA has been established by Bai in 1998 only in the case of some special weighting matrices, the unweighted TSA is usually used in practice. It is shown in this paper that the unweighted TSA indeed gives the optimal solution of the weighted nonlinear least squares problem formulated with a particular weighting matrix. This provides a theoretical justification of the unweighted TSA, and also leads to a generalization of the obtained result to the case of colored noise with noise whitening. Numerical examples of identification of Hammerstein systems are presented to validate the theoretical analysis.

Place, publisher, year, edition, pages
Elsevier, 2009. Vol. 45, no 11, 2627-2633 p.
Keyword [en]
Nonlinear system identification, Hammerstein system, Two-stage algorithm, Bilinear equation
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-52411DOI: 10.1016/j.automatica.2009.07.033OAI: oai:DiVA.org:liu-52411DiVA: diva2:285067
Available from: 2010-01-11 Created: 2009-12-18 Last updated: 2017-12-12

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Ljung, Lennart

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