Results 21 to 30 of about 23,037 (220)
Passive tracking of underwater acoustic targets based on multi-beam LOFAR and deep learning
PLoS ONE, 2022 Conventional passive tracking methods for underwater acoustic targets in sonar engineering generate time azimuth histogram and use it as a basis for target azimuth and tracking.
Maofa Wang +4 more
doaj +2 more sources
Acoustic methods improve the detection of the endangered African manatee
Frontiers in Marine Science, 2023 The African manatee (Trichechus senegalensis) is an elusive, data-deficient, and endangered species which inhabits marine and freshwater systems throughout Western and Central Africa.
Clinton Factheu +7 more
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WiFi-based PCL for monitoring private airfields [PDF]
, 2017 In this article, the potential exploitation of WiFi-based PCL systems is investigated with reference to a real-world civil application in which these sensors are expected to nicely complement the existing technologies adopted for monitoring purposes ...
BONGIOANNI, CARLO +4 more
core +1 more source
Underwater Acoustic Research Trends with Machine Learning: Active SONAR Applications
한국해양공학회지, 2020 Underwater acoustics, which is the study of phenomena related to sound waves in water, has been applied mainly in research on the use of sound navigation and range (SONAR) systems for communication, target detection, investigation of marine resources and
Haesang Yang +4 more
doaj +1 more source
Stationauxiliary operation technology for sonar digital image processing based on machine vision [PDF]
Zhihui kongzhi yu fangzhenPassive sonar operator of a ship needs to concentrate on observing sonar interface and underwater or surface target situation for a long time to extract key information manually maritime operations when surface vessels pass through sensitive waters ...
DAI Zhonghua, JIN Qiaoyuan, YANG Ding, CHENG Yu
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A theoretical and experimental investigation into multilayered piezoelectric composite transducers [PDF]
, 2002 The behaviour of a number of 3-1 connectivity piezoelectric composite plate transducers is presented. The fundamental thickness mode resonance of such devices is found to be contaminated by lateral resonant activity; this is evidenced in the measured and
Hayward, G., O'Leary, R.L.
core +1 more source
Using Sound to Enhance Users’ Experiences of Mobile Applications [PDF]
, 2012 The latest smartphones with GPS, electronic compass, directional audio, touch screens etc. hold potentials for location based services that are easier to use compared to traditional tools.
Liljedahl, Mats, Papworth, Nigel
core +4 more sources
Active Control of the Reflection Coefficient of an Underwater Surface
Acoustics, 2023 From a strategic point of view, it is essential to protect underwater vehicles from being detected by opponents. Modern mono- or bistatic sonar systems are capable of precisely determining the position of a watercraft.
Johannes Timmermann +2 more
doaj +1 more source
Multi-Stage Feature Extraction and Classification for Ship-Radiated Noise
Sensors, 2021 Due to the complexity and unique features of the hydroacoustic channel, ship-radiated noise (SRN) detected using a passive sonar tends mostly to distort. SRN feature extraction has been proposed to improve the detected passive sonar signal. Unfortunately,
Hamada Esmaiel +5 more
doaj +1 more source
Journal of Marine Science and Engineering, 2023 In submarine warfare systems, passive SONAR is commonly used to detect enemy targets while concealing one’s own submarine. The bearing information of a target obtained from passive SONAR can be accumulated over time and visually represented as a two ...
Won Shin, Da-Sol Kim, Hyunsuk Ko
doaj +1 more source