Investigation of hydro-acoustic tracking capability using multiple collaborating ocean gliders

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DOIResolve DOI: http://doi.org/10.4224/17712926
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TypeTechnical Report
Series titleStudent Report
Physical description34 p.
Subjecttracking system; sound source; hydrophones; arrays
AbstractThe possibility of a hydro-acoustic tracking system was investigated by developing a theoretical model using the underlying principles of sound propagation through water. The effectiveness of the tracking system depends on its ability to determine the direction and range to a sound source using multiple arrays of sound detectors (hydrophones). In three dimensional space it was found that at least four hydrophones are needed to determine the direction vector to a sound source. To determine the range to a sound source at least two physically separated arrays of at least four hydrophones are needed. To obtain an accurate direction vector to the sound source the relative time delay between the hydrophones in an array must be accurately determined. Cross-correlation of two audio signals provide the relative time shift, where the accuracy is primarily limited by the sampling frequency. A procedure was developed to accurately detect the direction and range to a sound source using audio and position data from the hydrophones. A preliminary experiment was performed in air using microphones to test the performance of the developed sound source detection system in two dimension. The results from the initial experiment was unsuccessful due to the smaller baseline between the microphones. It was found that larger baselines provide more accurate results. More testing should be conducted to quantify the performance of the developed sound source detection method. This method should be tested against different sound sources, different environments and different geometrical arrangements to identify its limitations. Finally, the hydrophone arrays will be integrated into ocean gliders and tested at sea.
Publication date
LanguageEnglish
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
NPARC number17712926
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Record identifier8f6d88ab-11fd-4db3-bacf-cf25d23d09e1
Record created2011-04-08
Record modified2016-10-03
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