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Indirect Methods of Fish Target Strength Estimation in Absolute and Logarithmic Domain

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The problem of indirect fish target strength estimation from data collected using single-beam system is based on transforming probability density function (PDF) of measured fish echo level into fish target strength PDF estimate. However, when estimating fish biomass the backscattering cross-section estimates are rather used for transforming echo voltages or echo integration outputs into fish density estimates. This implies, that rather non-logarithmic magnitudes should be used during echo data processing. The paper presents the results of estimation conducted on sample survey data and processed as well as in a logarithmic domain of fish target strength as in an absolute domain of backscattering cross-section. As the inverse problem, which has to be solved in the estimation procedure, in absolute domain is more ill-conditioned than its counterparts in logarithmic domain, the Adaptive Expectation Maximization and Smoothing (AEMS) inverse method is used. Additionally the results of transforming target strength PDF into backscattering cross-section PDF is compared with results obtained using direct processing in an absolute domain.
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Document Type: Research Article

Publication date: 01 September 2002

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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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