Abstract
A Forward Looking Sonar (FLS) is designed to detect obstacles ahead of a vessel. Detection performance of an FLS is affected by several environmental factors surrounding the sonar. Wakes generated by nearby vessels degrade the detection capability of an FLS. With more than 40 000 registered boats, Rhode Island's Narragansett Bay is a good example of a zone with heavy boat traffic where the performance of an FLS may be effected. FarSounder has collected vast amounts of data while testing and demonstrating its FLS sonars in Narragansett Bay. Using that data, this paper presents observations of FLS performance with and without boat wakes. In order to explain the sonar performance, a probability of wake presence in sonar field of view is estimated based on shipping density, wake size, and lifetime.
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