A post-processing technique to remove background noise from echo-integration data
Echo integration of biological organisms with a low target strength can be difficult because of the problem of setting suitable pre-integration thresholds, and this is particularly acute with higher frequencies, such as 120 or 200 kHz, which are often used in studies of euphausiids. One solution is...
Published in: | ICES Journal of Marine Science |
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1996
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/a-postprocessing-technique-to-remove-background-noise-from-echointegration-data(72d89f2b-4e48-4ab9-9273-d6ade4c728a7).html https://doi.org/10.1006/jmsc.1996.0046 http://www.scopus.com/inward/record.url?scp=0029729118&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/72d89f2b-4e48-4ab9-9273-d6ade4c728a7 2024-06-23T07:52:34+00:00 A post-processing technique to remove background noise from echo-integration data Watkins, JL Brierley, Andrew Stuart 1996-04 https://research-portal.st-andrews.ac.uk/en/researchoutput/a-postprocessing-technique-to-remove-background-noise-from-echointegration-data(72d89f2b-4e48-4ab9-9273-d6ade4c728a7).html https://doi.org/10.1006/jmsc.1996.0046 http://www.scopus.com/inward/record.url?scp=0029729118&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/a-postprocessing-technique-to-remove-background-noise-from-echointegration-data(72d89f2b-4e48-4ab9-9273-d6ade4c728a7).html info:eu-repo/semantics/restrictedAccess Watkins , JL & Brierley , A S 1996 , ' A post-processing technique to remove background noise from echo-integration data ' , ICES Journal of Marine Science , vol. 53 , no. 2 , pp. 339-344 . https://doi.org/10.1006/jmsc.1996.0046 echo integration noise removal threshold KRILL EUPHAUSIA-SUPERBA BACKSCATTERING STRENGTH article 1996 ftunstandrewcris https://doi.org/10.1006/jmsc.1996.0046 2024-06-13T00:07:09Z Echo integration of biological organisms with a low target strength can be difficult because of the problem of setting suitable pre-integration thresholds, and this is particularly acute with higher frequencies, such as 120 or 200 kHz, which are often used in studies of euphausiids. One solution is to integrate data without any threshold and then remove background noise during post-processing. Unthresholded, integrated data of micronekton and Euphausia superba collected with a SIMRAD EK500 at frequencies of 38 and 120 kHz are presented. The underlying background noise level follows a 20 log R + 2 alpha R relationship, which can be scaled to the minimum volume backscatter (Sv) in each layer during a transect and then subtracted from the entire data set to remove background noise. The utility of this procedure is demonstrated by making comparisons of Sv at each frequency and investigating the effect of noise removal on the identification of targets based on the dB difference (120 kHz Sv-38 kHz Sv). (C) 1996 International Council for the Exploration of the Sea Article in Journal/Newspaper Euphausia superba University of St Andrews: Research Portal ICES Journal of Marine Science 53 2 339 344 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
echo integration noise removal threshold KRILL EUPHAUSIA-SUPERBA BACKSCATTERING STRENGTH |
spellingShingle |
echo integration noise removal threshold KRILL EUPHAUSIA-SUPERBA BACKSCATTERING STRENGTH Watkins, JL Brierley, Andrew Stuart A post-processing technique to remove background noise from echo-integration data |
topic_facet |
echo integration noise removal threshold KRILL EUPHAUSIA-SUPERBA BACKSCATTERING STRENGTH |
description |
Echo integration of biological organisms with a low target strength can be difficult because of the problem of setting suitable pre-integration thresholds, and this is particularly acute with higher frequencies, such as 120 or 200 kHz, which are often used in studies of euphausiids. One solution is to integrate data without any threshold and then remove background noise during post-processing. Unthresholded, integrated data of micronekton and Euphausia superba collected with a SIMRAD EK500 at frequencies of 38 and 120 kHz are presented. The underlying background noise level follows a 20 log R + 2 alpha R relationship, which can be scaled to the minimum volume backscatter (Sv) in each layer during a transect and then subtracted from the entire data set to remove background noise. The utility of this procedure is demonstrated by making comparisons of Sv at each frequency and investigating the effect of noise removal on the identification of targets based on the dB difference (120 kHz Sv-38 kHz Sv). (C) 1996 International Council for the Exploration of the Sea |
format |
Article in Journal/Newspaper |
author |
Watkins, JL Brierley, Andrew Stuart |
author_facet |
Watkins, JL Brierley, Andrew Stuart |
author_sort |
Watkins, JL |
title |
A post-processing technique to remove background noise from echo-integration data |
title_short |
A post-processing technique to remove background noise from echo-integration data |
title_full |
A post-processing technique to remove background noise from echo-integration data |
title_fullStr |
A post-processing technique to remove background noise from echo-integration data |
title_full_unstemmed |
A post-processing technique to remove background noise from echo-integration data |
title_sort |
post-processing technique to remove background noise from echo-integration data |
publishDate |
1996 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/a-postprocessing-technique-to-remove-background-noise-from-echointegration-data(72d89f2b-4e48-4ab9-9273-d6ade4c728a7).html https://doi.org/10.1006/jmsc.1996.0046 http://www.scopus.com/inward/record.url?scp=0029729118&partnerID=8YFLogxK |
genre |
Euphausia superba |
genre_facet |
Euphausia superba |
op_source |
Watkins , JL & Brierley , A S 1996 , ' A post-processing technique to remove background noise from echo-integration data ' , ICES Journal of Marine Science , vol. 53 , no. 2 , pp. 339-344 . https://doi.org/10.1006/jmsc.1996.0046 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/a-postprocessing-technique-to-remove-background-noise-from-echointegration-data(72d89f2b-4e48-4ab9-9273-d6ade4c728a7).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1006/jmsc.1996.0046 |
container_title |
ICES Journal of Marine Science |
container_volume |
53 |
container_issue |
2 |
container_start_page |
339 |
op_container_end_page |
344 |
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1802643908980637696 |