A Bottom Reverberation Model Based on the Coupling Between Parabolic Equation and Scattering Strengths
The reverberation is an important issue in underwater acoustics, in particular in shallow water where it has serious consequences on the detection and classification performance of sonar systems. The prediction of the reverberation level is then required and several models have already been developed. In this paper, a shallow-water reverberation model REVPA is presented. On one hand, in order to deal with the forward propagation, a wide-angle parabolic equation model (based on the Fourth order Padé approximation) was developed. On the other hand, interface reverberation (backscattering) phenomena can be well described by scattering strength functions. The REVPA model is based on the coupling between a propagation model and a scattering law by means of a plane-wave decomposition. Whereas any scattering laws and/or bathymetry can be included in the REVPA model, we concentrated, in this paper, on Lambert's law to predict bottom reverberation in the range-invariant case. The simulations results obtained with the REVPA model were compared to the results given by two different models based on the normal-mode theory: for tens of simulations, peak errors ranged from 0.1 to 1 dB for constant sound-speed profiles and from 1 to 2 dB for variable ones.
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Document Type: Research Article
Publication date: March 1, 2012
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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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