Abstract
An innovative technique has been developed to localize intruders crossing an acoustic underwater tripwire surveillance system in shallow water chokepoints. In the context of defence against terrorism, an sample application would be the permanent autonomous detection and localization of small underwater vehicles or divers surreptitiously entering a friendly harbor. The proposed method uses forward propagation and produces an acoustic image of the whole underwater entrance of a harbor, scanning and checking for intrusion in the area of interest. It is anticipated that the system could provide a high image rate and improved performance in noisy, reverberating, and changing environment. This paper discusses results obtained from a scaled tank experiment and shows preliminary results at sea.
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