Seabed Characterisation Using Spectral Moments of the Echo Signal
Abstract:The paper presents the analysis of suitability of use the spectral moments of the single beam echo envelope for seafloor characterisation and classification. For approximately 15000 averaged echo pulses acquired in the southern Baltic Sea area, the calculations of spectral moments were performed and the correlation of the results with bottom characteristic features in different sites was evaluated. The obtained results revealed that some spectral moments carry very useful information for the seafloor characterisation. Namely, it was shown that the spectral width, which measures the spectral power density concentration around the dominant frequency, might well describe the structure of sediment layers. In addition, the suitability of fractal dimension calculated using continuous wavelet coefficients is also presented. The chosen set of spectral echo parameters was used in a classification procedure based on the applied cluster analysis, giving the percentage of correct results near 90%.
Document Type: Research Article
Publication date: September 1, 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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