Results 11 to 20 of about 4,731 (309)
Journal of Marine Science and Engineering, 2021 The interdisciplinary field of assessing the impacts of sound on marine life has benefited largely from the advancement of underwater acoustics that occurred after World War II.
Shane Guan +2 more
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Leveraging satellite observations and machine learning for underwater sound speed estimation [PDF]
Communications EngineeringUnderwater acoustics plays a vital role in climate science, marine ecosystems, environmental monitoring, mineral exploration, and oceanography. Accurate underwater sound speed data is crucial for acoustic modeling and applications such as sonar systems ...
Madusanka Madiligama +2 more
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Journal of Marine Science and Engineering, 2021 Underwater wireless communication has gained a great deal of attention in the last couple of decades because of its applications in the military, industrial, and monitoring sectors.
Liu Songzuo +5 more
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Passive depth estimation for a narrowband source using a single vector sensor in deep water [PDF]
JASA Express Letters, 2023 For a narrowband signal, an oscillating interference pattern is formed with a target's moving when receiving at the bottom of the sea. In this Letter, the interference pattern of a narrowband source is observed using a single vector sensor (SVS).
He Li +5 more
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Underwater acoustic metamaterials
National Science Review, 2022 Abstract Acoustic metamaterials have been widely investigated over the past few decades and have realized acoustic parameters that are not achievable using conventional materials. After demonstrating that locally resonant acoustic metamaterials are capable of acting as subwavelength unit cells, researchers have evaluated the possibility ...
Erqian Dong +5 more
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Underwater acoustic target recognition using attention-based deep neural network [PDF]
JASA Express Letters, 2021 Underwater acoustic target recognition based on ship-radiated noise is difficult owing to the complex marine environment and the interference by multiple targets. As an important technology for target recognition, deep-learning has high accuracy but poor
Xu Xiao +4 more
doaj +1 more source
A review of underwater acoustic metamaterials for underwater acoustic equipment
Frontiers in Physics, 2022 Researchers use underwater acoustic equipment to explore the unknown ocean environment, which is one of the important means to understand and utilize the ocean. For underwater acoustic equipment, the application of underwater acoustic metamaterials is the premise to ensure and improve the performance of underwater acoustic communication, acoustic ...
Zhenjing Zhu +17 more
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Model-based optimal action selection for Dyna-Q reverberation suppression cognitive sonar
EURASIP Journal on Advances in Signal Processing, 2023 The Doppler shift of low-speed targets is frequently disturbed by the reverberation Doppler spread clutter under the shallow sea. The clutter is generated by underwater scatterers, which increases the difficulty of Doppler estimation.
Yubin Fu +4 more
doaj +1 more source
A Hybrid–Source Ranging Method in Shallow Water Using Modal Dispersion Based on Deep Learning
Journal of Marine Science and Engineering, 2023 The relationship between modal elevation angle and the relative arrival time between modes, derived from exploiting modal dispersion, provides source information that is less susceptible to environmental influences.
Tong Wang +5 more
doaj +1 more source
Performance analysis on the speed spectrum estimation based on dual-HFM waveform
EURASIP Journal on Advances in Signal Processing, 2022 Real-time Doppler estimation of sonar signals is of great significance to underwater communication and detection. The Hyperbolic-Frequency-Modulated (HFM) waveform-based speed spectrum estimation is one of the modern methods for underwater Doppler ...
Runyu Wei +3 more
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