Right whale localisation using a downhill simplex inversion scheme

  • Francine Desharnais DRDC Atlantic, P.O. Box 1012, NS B2Y 3Z7, Canada
  • Mathieu Côté DRDC Atlantic, P.O. Box 1012, NS B2Y 3Z7, Canada
  • Colin J. Calnan Xwave, 36 Solutions Dr, Halifax, NS B3S 1N2, Canada
  • Gordon R. Ebbeson DRDC Atlantic, P.O. Box 1012, NS B2Y 3Z7, Canada
  • David J. Thomson DRDC Atlantic, P.O. Box 1012, NS B2Y 3Z7, Canada
  • Nicole E.B. Collison DRDC Atlantic, P.O. Box 1012, NS B2Y 3Z7, Canada
  • Chris A. Gillard DSTO, P.O. Box 1500, Salisbury, SA 5108, Australia
Keywords: Acoustic waves, Algorithms, Error analysis, Nonlinear systems, Problem solving, Simulated annealing, Datasets, Speed profiles, Travel delays, Whale localization

Abstract

The downhill simplex part of a hybrid nonlinear inversion procedure combining simulated annealing with a downhill simplex algorithm [S. E. Dosso and M.J. Wilmut, "An adaptive hybrid algorithm for geoacoustic inversion," Proceedings of the Fifth European Conference on Underwater Acoustics, 185-190 (2000)] was used to localize sounds from the workshop dataset. The procedure relies on relative arrival times for the direct propagation paths from the sources to each receiver. An eigenray model [S.E. Dosso, N.E.B. Collison, "Acoustic tracking of a freely drifting sonobuoy field," J. Acoust. Soc. Am. 111, 2166-2177 (2002)] was used to estimate travel time along the direct paths. The positions of the receivers and whales were obtained by inversion of estimated relative travel delays. It was found that the direct path assumption was a problem for the distances involved with the workshop dataset. This paper will discuss the solution of using a constant sound speed instead of actual sound speed profiles for localisation, as well as the error associated with arrival time inaccuracies. The error growth for multi-source cases will also be discussed.
Published
2004-06-01
How to Cite
1.
Desharnais F, Côté M, Calnan CJ, Ebbeson GR, Thomson DJ, Collison NE, Gillard CA. Right whale localisation using a downhill simplex inversion scheme. Canadian Acoustics [Internet]. 2004Jun.1 [cited 2019Oct.16];32(2):137-45. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1597
Section
Proceedings of the Acoustics Week in Canada