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dc.contributor.authorKhodabandeloo, Babak
dc.contributor.authorOna, Egil
dc.contributor.authorMacaulay, Gavin
dc.contributor.authorKorneliussen, Rolf
dc.date.accessioned2021-06-18T12:46:30Z
dc.date.available2021-06-18T12:46:30Z
dc.date.created2021-01-12T09:43:41Z
dc.date.issued2021
dc.identifier.citationJournal of the Acoustical Society of America. 2021, 149 (1), 87-101.en_US
dc.identifier.issn0001-4966
dc.identifier.urihttps://hdl.handle.net/11250/2760196
dc.description.abstractDistortion of acoustic wave caused by nonlinear propagation transfers acoustic energy into higher harmonics of the transmitted signal. When operating several broadband echosounders with non-overlapping frequency bands to cover a wide frequency range, higher harmonics generated by one band may interfere with the fundamental band of others. This interference (i.e., crosstalk) can adversely affect the measured backscattered amplitude frequency response and in some circumstances, appears as spurious targets above and/or below the main target in pulse-compressed echograms. The nonlinear propagation of frequency-modulated acoustic waves in a directional beam was modeled and used to assess methods to reduce the deleterious effects of harmonic components in the signal, and was also compared to field experiments using the seabed echo and a metallic target sphere, with good agreement. Two methods are shown to materially reduce crosstalk: (1) reduction in transmit power, which reduces crosstalk amplitude by a larger amount than the associated reduction in transmit power, and (2) selection of a proper Fourier window length in the processing stage. The effect of crosstalk was small (<0.4 dB or 10%) for area backscattering measurements, but could be several dB for target strength measurements at different frequencies, depending on the transmit signals and processing parameters.en_US
dc.language.isoengen_US
dc.titleNonlinear crosstalk in broadband multi-channel echosoundersen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionacceptedVersionen_US
dc.source.pagenumber87-101en_US
dc.source.volume149en_US
dc.source.journalJournal of the Acoustical Society of Americaen_US
dc.source.issue1en_US
dc.identifier.doi10.1121/10.0002943
dc.identifier.cristin1869584
dc.relation.projectNorges forskningsråd: 309512en_US
dc.relation.projectEC/H2020/817669en_US
dc.relation.projectNorges forskningsråd: 280546en_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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