Proposals for the collection of multifrequency acoustic data

Type Article
Date 2008-09
Language English
Author(s) Korneliussen R1, Diner Noel3, Ona E1, Berger Laurent3, Fernandes P2
Affiliation(s) 1 : Inst Marine Res, N-5817 Bergen, Norway.
2 : Marine Lab Aberdeen, Fisheries Res Serv, Aberdeen AB11 9DB, Scotland.
3 : IFREMER, F-29280 Plouzane, France.
Source ICES Journal of Marine Science (1054-3139) (Oxford university press), 2008-09 , Vol. 65 , N. 6 , P. 982-994
DOI 10.1093/icesjms/fsn052
WOS© Times Cited 59
Keyword(s) Species identification, Multifrequency acoustics, Data collection
Abstract Acoustic surveys are used to estimate the abundance and distribution of many fish species, and have been based traditionally on data collected at a single acoustic frequency. Although it has been known for some time that the use of additional frequencies can provide information on the nature of the acoustic target, the knowledge and technology required to combine the so-called "multifrequency data" in an appropriate manner has been limited. The use of several transducers of different frequencies is now common on board research vessels and fishing vessels, so multifrequency data are often collected. In order for these data to be combined appropriately, their physical and spatial characteristics from each frequency should be as similar as possible. We detail the requirements deemed necessary to collect multifrequency data in an appropriate manner. They can be stringent and may not always be achievable, so we also consider the consequences of combining acoustic data originating in transducers with varying degrees of spatial separation and with different beam widths.
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