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dc.contributor.authorPedersen, Audun Oppedal
dc.contributor.authorLunde, Per
dc.contributor.authorTichy, Frank
dc.contributor.authorKorneliussen, Rolf
dc.description.abstractScientific advice for governmental management of marine resources relies on acoustical observation methods. Quantification and identification of fish and plankton species are often achieved using multi-frequency acoustic data. Accurate measurements of backscattering cross-sections and volume backscattering coefficients are essential. Systematic errors from finite-amplitude sound propagation are demonstrated in experimental survey measurements on Atlantic mackerel using 120 kHz and 200 kHz echosounders and high power settings. Finite-amplitude signal distortion causes excess transmission loss that is not accounted for in fisheries acoustics today, other than by fixed limits on the maximum transmitted power. The demonstrated errors are of a magnitude that can seriously bias abundance estimation and species identification. It is shown how the finite-amplitude effects can be modelled and predicted quantitatively, within a framework of electroacoustic power budget equations. A method is provided to calculate related errors in echosounder calibration and oceanic measurement of acoustic volume backscattering. When accounting for finite-amplitude effects in echosounder signal processing, higher transmit powers can be used when needed to improve signal-to-noise ratio or extend measurement range. The results indicate that historical survey data can be adjusted for such errors using numerical simulations. The echosounder characteristics relevant to finite-amplitude effects can be determined by laboratory measurements.en_US
dc.publisherEDP Openen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleFinite-amplitude sound propagation effects in volume backscattering measurements for fish abundance estimationen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright The Author(s), Published by EDP Sciences, 2022en_US
dc.source.journalActa Acusticaen_US
dc.relation.projectNorges forskningsråd: 152790en_US
dc.relation.projectFiskeri- og havbruksnæringens forskningsfinansiering: 222042en_US
dc.identifier.citationActa Acustica. 2022, 6 (14).en_US

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