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Range-Depth Tracking of Sounds from a Single-Point Deployment by Exploiting the Deep-Water Sound Speed Minimum

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Technical Report

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University of California San Diego La Jolla United States

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The long-term goal of this work is to develop techniques for tracking marine mammal sounds in range and depth from a single mooring or platform e.g. glider, by exploiting the propagation effects of the deep-water sound speed channel. Most listening platforms currently use a single hydrophone to detect events, making no effort at localization. For beaked whales which have a limited detection range of about 5-7 km, detection may be sufficient to determine whether an animal is close to potential naval operations, but for most species, one needs to assume a typical source level or source level distribution to translate a detections received level into a distance, a risky assumption that generates large uncertainties in position, which in turn degrades attempts at acoustic density estimation and makes mitigation decisions problematic.The range of a marine mammal sound from a compact platform can also be obtained by detecting the same event across multiple platforms however, for logistic reasons it is highly desirable to investigate avenues for permitting relatively accurate localization from a single platform.

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