Short-range acoustic propagation using mobile transmitters under Arctic ice cover
Using mobile acoustic transmitters, acoustic propagation over short ranges was evaluated. Four Expendable Mobile ASW Training Targets (EMATTS) were deployed over two separate days to run at depths of 183, 91, and 46 meters. Emitted frequencies in the bands of 950 to 1150 hertz and 2800 to 3000 hertz...
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Monterey, California. Naval Postgraduate School
2017
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ftnavalpschool:oai:calhoun.nps.edu:10945/56122 2024-06-09T07:43:49+00:00 Short-range acoustic propagation using mobile transmitters under Arctic ice cover Doyle, Liam J. Joseph, John Reeder, D. Benjamin Oceanography 2017-09 application/pdf https://hdl.handle.net/10945/56122 unknown Monterey, California. Naval Postgraduate School https://hdl.handle.net/10945/56122 Copyright is reserved by the copyright owner. Arctic Beaufort Sea acoustic propagation transmission loss sound speed profile EMATT bellhop modeling Thesis 2017 ftnavalpschool 2024-05-15T00:41:33Z Using mobile acoustic transmitters, acoustic propagation over short ranges was evaluated. Four Expendable Mobile ASW Training Targets (EMATTS) were deployed over two separate days to run at depths of 183, 91, and 46 meters. Emitted frequencies in the bands of 950 to 1150 hertz and 2800 to 3000 hertz were recorded by omnidirectional receivers at ranges out to 10 kilometers. Sound speed profile data was also measured on site. Transmission loss models were created as a baseline at the various depths, ranges and frequencies. The recorded acoustic data was then analyzed to provide measured transmission loss profiles, including variability at range, in order to provide a comparison to the modeled data. A significant finding was the inability of the modeling software to accurately predict the surface water/ice scattering and absorptive effects on transmitted sound. In addition, sound speed variability by range (usually considered range-independent over short distances) was shown to have a strong effect on transmission. This was demonstrated by very large variances in received sound level (on the level of 30 to 40 decibels) at the same range and depth but different directions. Approved for public release; distribution is unlimited. Major, Royal Canadian Air Force http://archive.org/details/shortrangecousti1094556122 Thesis Arctic Beaufort Sea Naval Postgraduate School: Calhoun Arctic |
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Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
unknown |
topic |
Arctic Beaufort Sea acoustic propagation transmission loss sound speed profile EMATT bellhop modeling |
spellingShingle |
Arctic Beaufort Sea acoustic propagation transmission loss sound speed profile EMATT bellhop modeling Doyle, Liam J. Short-range acoustic propagation using mobile transmitters under Arctic ice cover |
topic_facet |
Arctic Beaufort Sea acoustic propagation transmission loss sound speed profile EMATT bellhop modeling |
description |
Using mobile acoustic transmitters, acoustic propagation over short ranges was evaluated. Four Expendable Mobile ASW Training Targets (EMATTS) were deployed over two separate days to run at depths of 183, 91, and 46 meters. Emitted frequencies in the bands of 950 to 1150 hertz and 2800 to 3000 hertz were recorded by omnidirectional receivers at ranges out to 10 kilometers. Sound speed profile data was also measured on site. Transmission loss models were created as a baseline at the various depths, ranges and frequencies. The recorded acoustic data was then analyzed to provide measured transmission loss profiles, including variability at range, in order to provide a comparison to the modeled data. A significant finding was the inability of the modeling software to accurately predict the surface water/ice scattering and absorptive effects on transmitted sound. In addition, sound speed variability by range (usually considered range-independent over short distances) was shown to have a strong effect on transmission. This was demonstrated by very large variances in received sound level (on the level of 30 to 40 decibels) at the same range and depth but different directions. Approved for public release; distribution is unlimited. Major, Royal Canadian Air Force http://archive.org/details/shortrangecousti1094556122 |
author2 |
Joseph, John Reeder, D. Benjamin Oceanography |
format |
Thesis |
author |
Doyle, Liam J. |
author_facet |
Doyle, Liam J. |
author_sort |
Doyle, Liam J. |
title |
Short-range acoustic propagation using mobile transmitters under Arctic ice cover |
title_short |
Short-range acoustic propagation using mobile transmitters under Arctic ice cover |
title_full |
Short-range acoustic propagation using mobile transmitters under Arctic ice cover |
title_fullStr |
Short-range acoustic propagation using mobile transmitters under Arctic ice cover |
title_full_unstemmed |
Short-range acoustic propagation using mobile transmitters under Arctic ice cover |
title_sort |
short-range acoustic propagation using mobile transmitters under arctic ice cover |
publisher |
Monterey, California. Naval Postgraduate School |
publishDate |
2017 |
url |
https://hdl.handle.net/10945/56122 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Beaufort Sea |
genre_facet |
Arctic Beaufort Sea |
op_relation |
https://hdl.handle.net/10945/56122 |
op_rights |
Copyright is reserved by the copyright owner. |
_version_ |
1801372672929562624 |