Localization of right whales using matched correlation processing
Keywords:Acoustic signal processing, Computer simulation, Hydrophones, Light reflection, Mathematical models, Underwater structures, Broadband sources, Matched Correlation Processing (MCP), Underwater sources
AbstractThe use of Matched Correlation Processing (MCP) for the localization of right whales was demonstrated. Model-based MCP techniques have been researched with the goal of improving the capability of passive sonar systems for localizing quiet underwater sources. The cross-correlations for a broadband source as measured with a pair of hydrophones in a horizontal array are matched with those generated with a correlation model for many candidate ranges and depth along a candidate bearing. These matches are carried out with a number of hydrophone pairs to form many range-depth ambiguity surfaces. A three-sensor horizontal array with an aperture of 125 m was deployed on the sea bottom in 68 m of water and the hydrophones were localized using an Array Element Localization (AEL) procedure. A light bulb was imploded at a depth of 41.5 m from hydrophone. Using light bulbs as simulated right whale gunshots, the technique was shown to work extremely well out to a range of about six water depths in an environment that has sufficient bottom reflections.
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