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 9 of 9 for “"Beaufort Lens"”.
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Low frequency active sonar performance in the Arctic Beaufort Lens
… environment present throughout much of the Beaufort Sea in the Arctic has a major effect on active acoustic transmissions. This work performs an in depth analysis of how the lower duct impacts the propagation of various active signals used commonly for acoustic communications or active …
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Low frequency active sonar performance in the Arctic Beaufort Lens
… environment present throughout much of the Beaufort Sea in the Arctic has a major effect on active acoustic transmissions. This work performs an in depth analysis of how the lower duct impacts the propagation of various active signals used commonly for acoustic communications or active …
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Environmental effects of the Beaufort Lens on underwater acoustic communications during Arctic operations
… ice is present. The recent presence of the Beaufort Lens is changing the acoustic propagation paths throughout the Arctic region. Here a network of buoys were employed to communicate with an Autonomous Undersea Vehicle (AUV) while it operated under the ice throughout the Beaufort Lens with …
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Environmental Effects of the Beaufort Lens on Underwater Acoustic Communications during Arctic Operations
… ice is present. The recent presence of the Beaufort Lens is changing the acoustic propagation paths throughout the Arctic region. Here a network of buoys were employed to communicate with an Autonomous Undersea Vehicle (AUV) while it operated under the ice throughout the Beaufort Lens with …
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A Virtual Ocean framework for environmentally adaptive, embedded acoustic navigation on autonomous underwater vehicles
… structure affects propagation. The Arctic’s Beaufort Gyre provides an excellent case study for this relationship via the Beaufort Lens, a recently observed influx of warm Pacific water that forms a widespread yet variable sound speed lens throughout the gyre. At short ranges, the lens …
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A Virtual Ocean framework for environmentally adaptive, embedded acoustic navigation on autonomous underwater vehicles
… structure affects propagation. The Arctic's Beaufort Gyre provides an excellent case study for this relationship via the Beaufort Lens, a recently observed influx of warm Pacific water that forms a widespread yet variable sound speed lens throughout the gyre. At short ranges, the lens …
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Multi-path Penalty metric in underwater acoustic communication for autonomy and human decision-making
… ratio (SNR) methods in the context of the Arctic Beaufort Sea. MPP and SNR are compared alongside a third performance metric, Minimum Achievable Error (MAE), which replicates the operation of a channel estimate-based decision feedback equalizer in an acoustic modem. The three metrics are then …
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Multi-path Penalty Metric in Underwater Acoustic Communication for Autonomy and Human Decision-making
… ratio (SNR) methods in the context of the Arctic Beaufort Sea. MPP and SNR are compared alongside a third performance metric, Minimum Achievable Error (MAE), which replicates the operation of a channel estimate-based decision feedback equalizer in an acoustic modem. The three metrics are then …
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Vehicle autonomy under the Arctic ice: environmental adaptation through model-aided machine learning
… are validated against data collected in the Beaufort Sea in March of 2020, where the presence of the Beaufort Lens combines with the surface ice covering the Arctic Ocean to create an ideal setting in which to demonstrate the importance of environmental adaptation. These capabilities may …