Version 1
: Received: 14 October 2024 / Approved: 15 October 2024 / Online: 15 October 2024 (15:11:18 CEST)
How to cite:
Le Bras, R.; Nielsen, P. Range and Depth Estimates of Whale Signals Recorded by Triplets of Hydrophones. Preprints2024, 2024101227. https://doi.org/10.20944/preprints202410.1227.v1
Le Bras, R.; Nielsen, P. Range and Depth Estimates of Whale Signals Recorded by Triplets of Hydrophones. Preprints 2024, 2024101227. https://doi.org/10.20944/preprints202410.1227.v1
Le Bras, R.; Nielsen, P. Range and Depth Estimates of Whale Signals Recorded by Triplets of Hydrophones. Preprints2024, 2024101227. https://doi.org/10.20944/preprints202410.1227.v1
APA Style
Le Bras, R., & Nielsen, P. (2024). Range and Depth Estimates of Whale Signals Recorded by Triplets of Hydrophones. Preprints. https://doi.org/10.20944/preprints202410.1227.v1
Chicago/Turabian Style
Le Bras, R. and Peter Nielsen. 2024 "Range and Depth Estimates of Whale Signals Recorded by Triplets of Hydrophones" Preprints. https://doi.org/10.20944/preprints202410.1227.v1
Abstract
The hydroacoustic in-water stations of the International Monitoring System (IMS) network consist of three hydrophones placed at Sound Fixing and Ranging (SOFAR) channel depths and about 2 km away from each other. Whale signals recorded in the vicinity of a hydrophone triplet offer the opportunity to verify simple models of propagation in the immediate neighborhood of the triplet, by comparing arrival times and amplitudes between the three hydrophones. Two examples of whales passing by hydrophone triplets are presented and conclusions drawn about waveform coherency and amplitude of the signals recorded at the three hydrophones in the 0-50 Hz frequency band. On the examples recorded at the HA11 IMS hydroacoustic station, the amplitude decay law of one over the distance is verified, and analysis of hundreds of calls located almost above the hydrophone triplet lead to the possibility that the H11S3 hydrophone may be located further from H11S1 and H11S2, and the H11S1 hydrophone’s depth may be deeper than expected from the published locations.
Keywords
hydro acoustics; signal processing; location methods
Subject
Environmental and Earth Sciences, Water Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
