2023_programme: Source Localization using Beam Migration Diagram and the Hausdorff Distance

• Session: 13. Sonar Performance Modelling and Verification: Applications to Active and Passive Sonar
  Organiser(s): Mathieu Colin, Mark Prior, Kevin Heaney and Dale Ellis
• Lecture: Source Localization using Beam Migration Diagram and the Hausdorff Distance [invited]
  Paper ID: 1951
  Author(s): Real Gaultier, Allouche Jean-Marc
  Presenter: Real Gaultier
  Abstract: In this paper, the authors focus on the analysis of an at-sea campaign near the eastern shore of Corsica, in the Western Mediterranean Sea. The experiment, part of the ALMA (Acoustic Laboratory for Marine Applications) project, was conducted in November 2016 by DGA Naval Systems. It consisted in transmitting complex waveforms (including Linear Frequency Modulation –LFM- pulses) from a moored acoustic pinger and recording the propagated sound signals on a moored passive acoustic array roughly 9.4 km away. \nThe passive acoustic array is a 5 high and 1.5 m wide comb-like array, structured in 4 Vertical Line Arrays (VLAs) each carrying 32 hydrophones, spatially sampled at 5 kHz (sensor spacing ) in the vertical dimension. It was moored on a 100m-deep sandy bottom, and oriented southwards (in the pinger’s direction). \nIn order to monitor in details the received sound field structure, the authors apply here a time-domain beamforming technique, followed by a coherent processing step. This procedure allows to obtain the beam migration diagram (in the elevation-delay plane). \nSeveral techniques can then be explored to estimate the source range, like the evaluation of the array invariant The authors will provide source and depth estimation based on the comparison of the experimental beam migration diagram to a ray-model outputs (Bellhop and/or an alternative model). Haussdorff distance-based localization techniques, who showed interesting results in similar approaches where environmental mismatch was likely, will be explored in this study. \nAn evaluation of the performance of this technique will be proposed, based on two sets of field data acquired in various configurations (fluctuating, or non-fluctuating), as changes in the sound speed may affect the output of the beamformer (loss of resolution, fluctuation of the estimated direction of arrival and array gain).
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• Corresponding author: Dr Gaultier Real
  Affiliation: DGA Naval Systems
  Country: France
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