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System identification in a networked environment using second order statistical properties
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
2013 (English)In: Automatica, ISSN 0005-1098, E-ISSN 1873-2836, Vol. 49, no 2, 652-659 p.Article in journal (Refereed) Published
Abstract [en]

System identification for networked control is considered. Due to the time-delays in the network, it can be difficult to work with a discrete-time model and a continuous-time model is therefore chosen. A covariance function based method that relies on the second order statistical properties of the output signal, where it is assumed that the input signal samples are from a discrete-time white noise sequence, is proposed for estimating the parameters. The method is easy to use since the actual time instants when new input signal levels are applied at the actuator do not have to be known. An analysis of the networked system and the effects of the time-delays is made, and the results of the analysis motivate and support the chosen approach. Numerical studies indicate that the method is robust to randomly distributed time-delays, packet drop-outs, and additive measurement noise.

Place, publisher, year, edition, pages
2013. Vol. 49, no 2, 652-659 p.
Keyword [en]
Continuous-time model, Covariance function, Networked control systems, Parameter estimation, System identification, Continuous time models, Discrete-time model, Measurement Noise, Networked controls, Networked environments, Networked systems, Output signal, Randomly distributed, Second orders, Signal level, Signal samples, Statistical properties, White noise sequence, Continuous time systems, Identification (control systems), Time delay, White noise, Numerical methods
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:uu:diva-194885DOI: 10.1016/j.automatica.2012.11.039ISI: 000315003100040OAI: oai:DiVA.org:uu-194885DiVA: diva2:606711
Available from: 2013-02-20 Created: 2013-02-19 Last updated: 2017-12-06Bibliographically approved

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Söderström, Torsten

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