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Consistency aspects of Wiener-Hammerstein model identification in presence of process noise

Giuseppe Giordano (Institutionen för signaler och system, Mekatronik) ; Jonas Sjöberg (Institutionen för signaler och system, Mekatronik)
Proceedings of 2016 IEEE 55th Conference on Decision and Control (CDC 2016); Las Vegas; United States; 12-14 December 2016 (0743-1546). p. Art no 7798724, Pages 3042-3047. (2016)
[Konferensbidrag, refereegranskat]

The Wiener-Hammerstein model is a block-oriented model consisting of two linear blocks and a static nonlinearity in the middle. Several identification approaches for this model structure rely on the fact that the best linear approximation of the system is a consistent estimate of the two linear parts, under the hypothesis of Gaussian excitation. But, these approaches do not consider the presence of other disturbance sources than measurement noise. In this paper we consider the presence of a disturbance entering before the nonlinearity (process noise) and we show that, also in this case, the best linear approximation is a consistent estimate of underlying linear dynamics. Furthermore, we analyse the impact of the process noise on the nonlinearity estimation, showing that a standard prediction error method approach can lead to biased results.



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Denna post skapades 2017-01-09. Senast ändrad 2017-07-07.
CPL Pubid: 246721

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Mekatronik (2005-2017)

Ämnesområden

Informations- och kommunikationsteknik
Reglerteknik
Datorsystem

Chalmers infrastruktur