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Measuring subsample time delay differences in narrowband ultrasonic echoes
1994 (English)In: Norsig 94: Nordic Signal Processing Symposium ; Ålesund, Norway, June 2 - June 4 1994 / [ed] John M. Leirvik; Anders Wahlin, Trondheim: Norsk forening for signalbehandling , 1994, 290-293 p.Conference paper (Refereed)
Abstract [en]

In many areas the time delay of arrival (TDOA) is desired. In the case of narrowband signals we us a new fast and simple method to estimate small time delays. This method has good accuracy for delays on the order of fractions of the sample interval. It is based on forming the scalar product of the signal and its Hilbert transform. The method can be applied to narrowband signals where the measurements are repeatable, such as ultrasonic imaging. In ultrasonic applications, due to fluctuations in the insonified media, especially in the air, a small random time shift may be present. By placing a wire at a fixed distance from the transducer, so small that it does not disturb the main echo from the surface but still gives a reference echo strong enough to use our method, we make corrections to the arrival time of the main echo.

Place, publisher, year, edition, pages
Trondheim: Norsk forening for signalbehandling , 1994. 290-293 p.
Research subject
Signal Processing
URN: urn:nbn:se:ltu:diva-37892Local ID: c11f16d0-e083-11dc-9e29-000ea68e967bISBN: 8299315808OAI: diva2:1011390
Nordic Signal Processing Symposium : 01/06/1994 - 01/06/1994
Godkänd; 1994; 20080221 (ysko)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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