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Detection and Imaging of Buried Objects with a Sediment Sonar

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At-Sea experiments were carried out by the German Navy Research Institute FWG in order to investigate the detection/classification of buried or partially buried objects. Constraints on the array size together with the underlying acoustics do not allow to image buried objects in the same way as this is normally done with high-frequency systems looking at proud objects. The aim of the experimental work, therefore, concentrates on looking for alternative classification clues that could replace the roll of highlight/shadow ratios, shadow shapes, etc, well known from high resolution proud object classification.

Making a compromise between the two conflicting requirements concerning system resolution and sound penetration, the experimental sonar system consisted of a 2-dim planar array with up to 3° resolution. Signals with two different (20 kHz and 10 kHz) center frequencies were used. Regular signals from transponders that were placed next to the buried objects were used to identify and distinguish echo signals from real and false targets.

The array produces 3-dimensional images of the upper sediment layer from a small range of different aspect angles. This allows to proceed from simple detection towards classification in the sense that shape, orientation and location on/in/below the sediment surface can be determined. This is demonstrated with some examples from the latest at-sea experiments in the Baltic Sea.

Document Type: Research Article

Publication date: 2002-09-01

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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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