Results 11 to 20 of about 1,483 (184)

Deep‐learning‐based line enhancer for passive sonar systems

IET Radar, Sonar & Navigation, 2022
Detection of acoustic tonals from surfaces and underwater vehicles is important for passive sonar systems. Enhancements of the tonals are usually necessary in passive sonar prior to detections.
Donghao Ju, Cheng Chi, Zigao Li, Yu Li, Chunhua Zhang, Haining Huang   +5 more
doaj   +1 more source

Changes in the Movement and Calling Behavior of Minke Whales (Balaenoptera acutorostrata) in Response to Navy Training

Frontiers in Marine Science, 2021
Many marine mammals rely on sound for foraging, maintaining group cohesion, navigation, finding mates, and avoiding predators. These behaviors are potentially disrupted by anthropogenic noise.
Ian N. Durbach, Ian N. Durbach, Catriona M. Harris, Cameron Martin, Tyler A. Helble, E. Elizabeth Henderson, Glenn Ierley, Len Thomas, Stephen W. Martin   +8 more
doaj   +1 more source

A Survey of Underwater Acoustic Data Classification Methods Using Deep Learning for Shoreline Surveillance

Sensors, 2022
This paper presents a comprehensive overview of current deep-learning methods for automatic object classification of underwater sonar data for shoreline surveillance, concentrating mostly on the classification of vessels from passive sonar data and the ...
Lucas C. F. Domingos, Paulo E. Santos, Phillip S. M. Skelton, Russell S. A. Brinkworth, Karl Sammut   +4 more
doaj   +1 more source

Passive Sonar Target Tracking Based on Deep Learning

Journal of Marine Science and Engineering, 2022
At present, the tracking accuracy of underwater passive target tracking is often limited due to models that are overly simple, with low complexity, poor universality, and an inability to learn.
Ying Wang, Hongjian Wang, Qing Li, Yao Xiao, Xicheng Ban   +4 more
doaj   +1 more source

Passive Sonar Target Detection Using Statistical Classifier and Adaptive Threshold

Applied Sciences, 2018
This paper presents the results of an experimental investigation about target detecting with passive sonar in Persian Gulf. Detecting propagated sounds in the water is one of the basic challenges of the researchers in sonar field.
Hamed Komari Alaie, Hassan Farsi
doaj   +1 more source

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, Baochun Qiu, Zefei Zhu, Li Ma, Chuanping Zhou   +4 more
doaj   +2 more sources

Simulated Research on Passive Sonar Range Using Different Hydrographic Conditions

MATEC Web of Conferences, 2015
As an example using the passive sonar, it calculated the quality factor of passive sonar using the sonar equation. The sound field was calculated under different depth and range using multiform hydrographic conditions.
Han Jing, Zhang XueGang, Meng ChunXia, Cao Feng   +3 more
doaj   +1 more source

A risk function for behavioral disruption of Blainville's beaked whales (Mesoplodon densirostris) from mid-frequency active sonar. [PDF]

PLoS ONE, 2014
There is increasing concern about the potential effects of noise pollution on marine life in the world's oceans. For marine mammals, anthropogenic sounds may cause behavioral disruption, and this can be quantified using a risk function that relates sound
David Moretti, Len Thomas, Tiago Marques, John Harwood, Ashley Dilley, Bert Neales, Jessica Shaffer, Elena McCarthy, Leslie New, Susan Jarvis, Ronald Morrissey   +10 more
doaj   +1 more source

Pulsed Active Sonar Using Generalized Sinusoidal Frequency Modulation for High-Speed Underwater Target Detection and Tracking

IEEE Access, 2023
For decades, the soft-kill strategy which detects high-speed underwater targets with passive sonar and attract the targets using decoys has been used. However, recently, the paradigm to respond to the high-speed underwater targets is shifting to a hard ...
Jinuk Park, Geunhwan Kim, Jongwon Seok, Jungpyo Hong   +3 more
doaj   +1 more source

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, Clinton Factheu, Athena M. Rycyk, Sévilor Kekeunou, Lucy W. Keith-Diagne, Eric A. Ramos, Mumi Kikuchi, Aristide Takoukam Kamla   +7 more
doaj   +1 more source