Measurement and modeling of the acoustic field near an underwater vehicle and implications for acoustic source localization

The performance of traditional techniques of passive localization in ocean acoustics such as time-of-arrival (phase differences) and amplitude ratios measured by multiple receivers may be degraded when the receivers are placed on an underwater vehicle due to effects of scattering. However, knowledge...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2007-08, Vol.122 (2), p.892-905
Main Authors: LEPPER, Paul A, D'SPAIN, Gerald L
Format: Article
Language:English
Subjects:
Acoustics
Ecological Systems, Closed
Equipment Design
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Glass
Humans
Models, Theoretical
Physics
Reproducibility of Results
Seawater
Sound Localization - physiology
Submarine Medicine
Time Factors
Underwater sound
Water
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Summary:The performance of traditional techniques of passive localization in ocean acoustics such as time-of-arrival (phase differences) and amplitude ratios measured by multiple receivers may be degraded when the receivers are placed on an underwater vehicle due to effects of scattering. However, knowledge of the interference pattern caused by scattering provides a potential enhancement to traditional source localization techniques. Results based on a study using data from a multi-element receiving array mounted on the inner shroud of an autonomous underwater vehicle show that scattering causes the localization ambiguities (side lobes) to decrease in overall level and to move closer to the true source location, thereby improving localization performance, for signals in the frequency band 2-8 kHz. These measurements are compared with numerical modeling results from a two-dimensional time domain finite difference scheme for scattering from two fluid-loaded cylindrical shells. Measured and numerically modeled results are presented for multiple source aspect angles and frequencies. Matched field processing techniques quantify the source localization capabilities for both measurements and numerical modeling output.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.2749410