Estimation of Seabed Models by Inversion of Broadband Acoustic Data
Inversion methods based on spatial coherence of multi-tone CW data have been applied extensively in underwater acoustics to estimate geoacoustic profiles. This paper presents results for a different approach based on using the time coherent information in a broadband signal measured at a single hydrophone. The inversion is formulated as an optimization problem to determine the geoacoustic model that provides the best fit between measured signal waveforms and replica waveforms that are calculated using ray theory. An efficient hybrid search method that combines simulated annealing with a local downhill simplex algorithm is used to search the multi-dimensional model parameter space that includes both the geoacoustic and geometrical parameters of the experiment. The method is applied to data from the INTIMATE'98 shallow water experiment to estimate the sound speed and density at the sea floor. The inversion obtained stable estimates of the most sensitive geoacoustic model parameters that were in good agreement with ground truth data that were obtained for the site.
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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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