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Showing 1 to 17 of 17 for “"passive sonar"”.
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A Factorial Study of the Meaning of Complex Auditory Stimuli (Passive Sonar Sounds)
Made available in DSpace on 2014-12-03T23:50:37Z (GMT). No. of bitstreams: 1 0009147.pdf: 4756378 bytes, checksum: ba5456a1800467dffae8718b7154b5db (MD5) Previous issue date: 1954
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Automated open circuit scuba diver detection with low cost passive sonar and machine learning
… scuba diver detection using low-cost passive sonar and machine learning. Previous automated passive sonar scuba diver detection systems required matching the frequency of diver breathing transients to that of an assumed diver breathing frequency. Earlier work required prior knowledge …
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Automated open circuit scuba diver detection with low cost passive sonar and machine learning
… scuba diver detection using low-cost passive sonar and machine learning. Previous automated passive sonar scuba diver detection systems required matching the frequency of diver breathing transients to that of an assumed diver breathing frequency. Earlier work required prior knowledge …
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Performance Analysis Of Active and Passive Multi-Array Sonar Networks
… results these networks obtain using active and passive sonar. These results determine the ideal sensor placement for optimal parameter detection and estimation of targets. This work's first part focuses on active sonar networks with a fixed number of sensors in a differing number of arrays. …
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Information fusion for an unmanned underwater vehicle through probabilistic prediction and optimal matching
… information system (AIS) data and active and passive sonar sensors. A linear assignment problem with learned assignment costs is solved to fuse sonar and AIS data. Since the sensors operate effectively at different depths, there is a time lag between AIS and sonar data collection. A recurrent …
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Examination of selected passive tracking schemes using adaptive kalman filtering
In the past, passive SONAR range tracking systems have used Extended Kalman filters to process nonlinear time-delay measurements. This approach has several flaws due to the inherent divergence problems of Extended Kalman filters. This paper discusses a new approach which uses a prefilter to …
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Dynamics of Multi-Agent Systems with Bio-Inspired Active and Passive Sensing
Active sensors, such as radar, lidar and sonar, emit a signal into the environment and gather information from its reflection. In contrast, passive sensors such as cameras and microphones rely on the signals emitted from the environment. In the current application of active sensors in multi-agent …
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Coordinated tracking and interception of an acoustic target using autonomous surface vehicles
… adaptively track a target of interest in situ by passive sonar only. Environmental factors play a large role in how sound propagates in the ocean, and so the vehicle must be able to adapt based on its surrounding environment to optimize acoustic track on a contact. This thesis examines the use of …
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Automated detection of a crossing contact based on its Doppler shift
… in the automated detection of contacts in passive sonar systems. A common approach is the application of highgain processing followed by successive classification criteria. Most classification schemes (e.g., matching of signature) are complex and tailored to specific target types. By …
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Coordinated tracking and interception of an acoustic target using autonomous surface vehicles
… adaptively track a target of interest in situ by passive sonar only. Environmental factors play a large role in how sound propagates in the ocean, and so the vehicle must be able to adapt based on its surrounding environment to optimize acoustic track on a contact. This thesis examines the use of …
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Spectrogram Track Detection: An Active Contour Algorithm
… of non-transitory frequency components in passive sonar data, a problem which finds many applications. This problem is typically transformed into the pattern recognition domain by representing the time-series data as a spectrogram, in which slowly varying periodic signals appear as …
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Advances in passive acoustic detection, localization, and tracking applied to unmanned underwater vehicles
… of shipping traffic is a critical task for passive acoustic harbor security systems. In general, vessels can be tracked by their unique acoustic signature due to machinery vibration and cavitation noise. However, cavitation noise of UUVs is considerably quieter than ships and boats, making …
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Characterization of Soundscapes in Shallow Water Habitats of the Florida Keys (USA) and Their Influence on the Settlement of Larval Fish and Invertebrates
… habitat (Chapter 3); and (4) employ the passive sonar equation and distance sampling techniques to evaluate how the loss of large sponges affected the densities and abundances of snapping shrimp (Chapter 4).</p> <p>I found that near-shore habitats exhibit distinct soundscapes, that …
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Passive Acoustics: A Multifaceted Tool for Marine Mammal Conservation
… communication and navigation. For this reason, passive acoustics has particularly high potential for marine mammal studies, especially those aimed at population management and conservation. Despite the rapid realization of this potential through a growing number of studies, much crucial …
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Passive Acoustic Localization and Tracking with Mobile Robots
… sensing onboard mobile robotic platforms in passive bearing-only tracking of surface vessels in the water and in detecting nearby obstacles in aerial systems.</p><p>First, we consider the problem of target tracking with a bearing-only sensor in the presence of merged measurements. Assuming …