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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 8, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1326-1334; doi:10.1093/icesjms/fsp125
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: The Ecosystem Approach with Fisheries Acoustics and Complementary Technologies [View the issue table of contents]

Calibration methods for two scientific multibeam systems

Egil Ona1, Valerie Mazauric2 and Lars Nonboe Andersen3

1 Institute of Marine Research, PO Box 1870 Nordnes, NO 5817 Bergen, Norway
2 Ifremer—Paris, Direction des Moyens et Opérations Navals, 155 rue Jean-Jacques Rousseau, 92138 Issy-Les-Moulineaux, France
3 Simrad, PO Box 111, NO 3191 Horten, Norway

Correspondence to E. Ona: tel: +47 55 23 84 55; fax: +47 55 23 85 31; e-mail: egil.ona{at}imr.no.

Ona, E., Mazauric, V., and Andersen, L. N. 2009. Calibration methods for two scientific multibeam systems. – ICES Journal of Marine Science, 66: 1326–1334.

The new Simrad scientific multibeam systems, the MS70 sonar and the ME70 echosounder, each transmit over many electronically formed beams with centre frequencies spanning from 70 to 120 kHz. Calibrations of these systems are therefore more complex than for conventional split-beam echosounder systems. Two large tungsten-carbide spheres (75 and 84 mm diameter) were designed and manufactured to facilitate accurate field calibrations over the entire operational bandwidth. These are heavy and therefore stable when suspended beneath a ship, and have target strengths much larger than those of biological targets potentially within the measurement volume. This paper presents procedures for calibrating each system in the field and the results from two such experiments. Detailed inspections of the results for individual beams indicate that minor adjustments in the described procedures might further improve the reported calibration accuracy.

Keywords: acoustic surveys, calibration, echosounder, ME70, MS70, multibeam, sonar

Received 8 August 2008; accepted 18 February 2009; advance access publication 8 May 2009.


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