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Compensating distortion effects in repeated measurements under non-stationary conditions
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.ORCID iD: 0000-0002-6289-4949
2009 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 20, no 2Article in journal (Refereed) Published
Abstract [en]

In this paper a compensation technique is presented for applications using repeated measurements under moderate non-stationary measurement conditions. The assumption is that the measurement conditions are stationary during a single repeated measurement but non-stationary over the entire measurement time. The objective with repeated measurements is often to retrieve an estimate of the (noise reduced) signal and its uncertainties. In order to obtain accurate estimates of these two quantities, stationary measurement conditions must be guaranteed under the measurement time. A condition that in many situations is difficult to achieve, e.g., during long measurement times or in a rapidly changing environment. The proposed method compensates for linear dynamic changes during the measurement time, where the dynamical changes, the underlying signal waveform and the noise covariance are considered unknown. The theoretical effect of moderate non-stationary conditions on repeated measurements is analyzed and experimentally validated. Estimation results using the proposed technique are presented for repeated ultrasonic measurements under non-stationary temperature conditions. The results show accurate signal estimation and noise characterization with uncorrelated normally distributed residuals, in contrast to standard synchronization techniques

Place, publisher, year, edition, pages
2009. Vol. 20, no 2
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
URN: urn:nbn:se:ltu:diva-9026DOI: 10.1088/0957-0233/20/2/025103ISI: 000262582500006Scopus ID: 2-s2.0-63749121983Local ID: 79634d20-c1e7-11dd-a054-000ea68e967bOAI: oai:DiVA.org:ltu-9026DiVA, id: diva2:981964
Note

Validerad; 2009; Bibliografisk uppgift: Paper id:: 025103; 20081204 (jesper)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Martinsson, Jesper

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CiteExportLink to record
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  • apa
  • harvard1
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