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Analysis of a Phase Method for Time-Delay Estimation. Short Version.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
2003 (English)Report (Other academic)
Abstract [en]

In this report, estimation of time delays in linear dynamical systems with additive noise is studied. The report reviews and analyses a certain estimation method: A discrete-time model of a continuous-time system is identified. The non-minimum phase zeros form the allpass part of the model. The dead-time is estimated by the slope at low frequencies of the phase of the allpass part. The method has been experimentally studied with the aid of simulations in open and closed loop. The results show that the estimation method can be used with several different model structures. The method is, however, non-robust and can totally fail in some cases. The probability of failure depends on the model structure, the input signal type and the signal-to-noise ratio. The estimation method can be made more robust by removing false non-minimum phase zeros, caused by the noise, in a certain way. It is usually better not to prewhite the data applied to the method.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2003. , 6 p.
LiTH-ISY-R, ISSN 1400-3902 ; 2539
Keyword [en]
Time-delay, Dead-time, Estimation, System identification, Laguerre, Linear dynamic systems, Non-minimum phase, Zero, ANOVA
National Category
Control Engineering
URN: urn:nbn:se:liu:diva-55953ISRN: LiTH-ISY-R-2539OAI: diva2:316784
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2014-06-26Bibliographically approved

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Björklund, Svante
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Automatic ControlThe Institute of Technology
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