liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Closed-Loop Identification Revisited
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
1997 (English)Report (Other academic)
Abstract [en]

Identification of systems operating in closed loop has long been of prime interest in industrial applications. The problem offers many possibilities, and also some fallacies, and a wide variety of approaches have been suggested, many quite recently. The purpose of the current contribution is to place most of these approaches in a coherent framework, thereby showing their connections and display similarities and differences in the asymptotic properties of the resulting estimates. The common framework is created by the basic prediction error method, and it is shown that most of the common methods correspond to different parameterizations of the dynamics and noise models. The so-called indirect methods, e.g., are indeed “direct” methods employing noise models that contain the regulator. The asymptotic properties of the estimates then follow from the general theory and take different forms as they are translated to the particular parameterizations. We also study a new projection approach to closed-loop identification with the advantage of allowing approximation of the open-loop dynamics in a given, and user-chosen frequency domain norm, even in the case of an unknown, nonlinear regulator.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 1997. , 46 p.
LiTH-ISY-R, ISSN 1400-3902 ; 1959
Keyword [en]
System identification, Closed-loop identification, Prediction error methods
Keyword [sv]
Cybernetik Informationsteori, Maskinelement Servomekanismer Automation
National Category
Control Engineering
URN: urn:nbn:se:liu:diva-55393ISRN: LITH-ISY-R-1959OAI: diva2:315988
Available from: 2010-04-29 Created: 2010-04-29 Last updated: 2014-09-16Bibliographically approved

Open Access in DiVA

fulltext(412 kB)217 downloads
File information
File name FULLTEXT02.pdfFile size 412 kBChecksum SHA-512
Type fulltextMimetype application/pdf
fulltext(1311 kB)251 downloads
File information
File name FULLTEXT01.psFile size 1311 kBChecksum SHA-512
Type fulltextMimetype application/postscript

Search in DiVA

By author/editor
Ljung, Lennart
By organisation
Automatic ControlThe Institute of Technology
Control Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 468 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 83 hits
ReferencesLink to record
Permanent link

Direct link