Localisation of right whale sounds in the workshop bay of fundy dataset by spectrogram cross-correlation and hyperbolic fixing

Authors

  • Marjo H. Laurinolli Department of Fisheries, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, NS B2Y 4A2
  • Alex E. Hay Department of Oceanography, Dalhousie University, Halifax, NS B3H 4J1

Keywords:

Acoustic waves, Correlation methods, Error analysis, Hydrophones, Oceanography, Spectrum analysis, Datasets, Gunshot sounds, Hyperbolic fixing, Whale sounds

Abstract

In September 2002, five ocean-bottom hydrophones recorded acoustic data in the Bay of Fundy at 1200 Hz sampling frequency for 165.6 h. Arrival time differences for 15 right whale sounds (5 gunshots, 10 tonals) were determined by spectrogram cross-correlation of logarithmic (i.e. dB re 1 ?Pa 2/Hz) spectral densities. The sound source locations were estimated from the intersections of the linearly independent equal time difference hyperbolae for different hydrophone pairs. The root-mean-square (RMS) localisation error was examined using three sound speeds. The lowest average RMS error of 0.85 km was obtained for 1485 m/s, roughly 7 m/s less than the measured average sound speed. The non-gunshot sounds had greater localisation error than the gunshot sounds by 0.4 km. The mean and maximum ranges from the centre hydrophone in the array were 10 km and 33 km respectively.

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Published

2004-06-01

How to Cite

1.
Laurinolli MH, Hay AE. Localisation of right whale sounds in the workshop bay of fundy dataset by spectrogram cross-correlation and hyperbolic fixing. Canadian Acoustics [Internet]. 2004 Jun. 1 [cited 2023 May 28];32(2):132-6. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1596

Issue

Vol. 32 No. 2 (2004)

Section

Proceedings of the Acoustics Week in Canada

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