Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"hydrophone arrays"”.
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Tracking sperm whales using passive acoustics and particle filters
… academic institutions from boats or ships towing hydrophone arrays often comprising only two elements. The arrival time-delay of the acoustic wavefront from the vocalising animals across the array aperture is computed, often using freely available software, and typically regarded as the bearing of …
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Deployment of a passive acoustic detection system for reactive collision avoidance in autonomous underwater vehicles
… and process data from static and vehicle-mounted hydrophone arrays, and preliminary measurements were post-processed using various signal smoothing and data-fitting techniques. Results were then compared with a mathematical model used to describe the expected sound propagation profile, to identify …
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Deep learning framework for solving geoacoustic inversion problems using normal mode theory
… system is developed for use with a single hydrophone. This system detects impulsive acoustic events, locates the source, and inverts key geoacoustic parameters, including sediment sound speed, density, and layer thickness. Validation using data from the 2022 Seabed Characterization …
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Interactions between harbour porpoises and aquaculture on the west coast of Scotland
… whiting (Merlangius merlangus). Finally, hydrophone arrays were deployed and found to be successful in monitoring fine-scale movement of echolocating harbour porpoises amongst farm infrastructure. The present study affirms that interactions between salmon aquaculture and porpoises commonly …
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Acoustical characterization of glacierized fjords
… October 2016 and May 2017 from an underwater hydrophone array moored 500 m from LeConte Glacier. Ambient noise levels (ANL) from recordings were clustered, revealing relationships between ambient noise and the speed of icebergs above the mooring and with calving events. In particular, the …
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Who Said That? Towards a Machine-Prediction-Based Approach to Tursiops Truncatus Whistle Localization and Attribution in a Reverberant Dolphinarium
… work involving the installation of permanent hydrophone arrays and cameras in a dolphinarium that enforces strict animal safety regulations. Attributing tonal sounds via the process of sound localization – estimation of a sound's point of origin based on the physical properties of its …
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Sensor Array Processing with Manifold Uncertainty
… thesis, array manifold ambiguities for linear arrays of omni-directional sensors in non-dispersive fields are considered. </p><p>First, the problem of underwater a hydrophone array towed behind a maneuvering platform is considered. The array consists of many hydrophones mounted to a flexible …