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Calibration sphere for low-frequency parametric sonars

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dc.contributor.author Foote, Kenneth G.
dc.contributor.author Francis, David T. I.
dc.contributor.author Atkins, Philip R.
dc.date.accessioned 2008-08-14T19:38:00Z
dc.date.available 2008-08-14T19:38:00Z
dc.date.issued 2007-03
dc.identifier.citation Journal of the Acoustical Society of America 121 (2007): 1482-1490 en
dc.identifier.uri http://hdl.handle.net/1912/2337
dc.description Author Posting. © Acoustical Society of America, 2007. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 121 (2007): 1482-1490, doi:10.1121/1.2434244. en
dc.description.abstract The problem of calibrating parametric sonar systems at low difference frequencies used in backscattering applications is addressed. A particular parametric sonar is considered: the Simrad TOPAS PS18 Parametric Sub-bottom Profiler. This generates difference-frequency signals in the band 0.5–6 kHz. A standard target is specified according to optimization conditions based on maximizing the target strength consistent with the target strength being independent of orientation and the target being physically manageable. The second condition is expressed as the target having an immersion weight less than 200 N. The result is a 280-mm-diam sphere of aluminum. Its target strength varies from −43.4 dB at 0.5 kHz to −20.2 dB at 6 kHz. Maximum excursions in target strength over the frequency band due to uncertainty in material properties of the sphere are of order ±0.1 dB. Maximum excursions in target strength due to variations in mass density and sound speed of the immersion medium are larger, but can be eliminated by attention to the hydrographic conditions. The results are also applicable to the standard-target calibration of conventional sonars operating at low-kilohertz frequencies. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Acoustical Society of America en
dc.relation.uri http://dx.doi.org/10.1121/1.2434244
dc.subject Sonar en
dc.subject Acoustic parametric devices en
dc.subject Acoustic measurement en
dc.subject Underwater sound en
dc.subject Calibration en
dc.title Calibration sphere for low-frequency parametric sonars en
dc.type Article en
dc.identifier.doi 10.1121/1.2434244


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