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A Prolate Spheroidal Approach for Fish Target Strength Estimation: Modeling and Measurements

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The prolate spheroidal model is reexamined to simulate the backscattered target strength by a fish through coherent treatment of the swimbladder (gas-filled spheroid) and fish body (liquid-filled spheroid). The wavelength/fish size applicability range of the model is expanded via implementation of non-traditional algorithms to calculate the prolate spheroidal radial functions. Results demonstrate the relevance of including the fish body backscatter contribution and the random nature of fish behavior to obtain good agreement between model predictions and measurements. The model was tested by comparison with direct measurements of acoustic backscattering target strength of caged fish (Percichthys trucha) using a 38 kHz split-beam echosounder. Reported values of measured maximum and averaged target strength (in the intensity domain) from gadoids (bladdered fish) and mackerel (bladderless fish) were also compared with model predictions. In all cases, a good agreement was obtained when comparing simulated and measured results.
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Document Type: Research Article

Publication date: September 1, 2015

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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