Results 21 to 30 of about 1,483 (184)
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
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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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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
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Underwater Tone Detection with Robust Coherently-Averaged Power Processor
Journal of Marine Science and Engineering, 2022 The detection of tonal signals with unknown frequencies is an important area of study in underwater signal processing. A common approach to address this issue is to use the Discrete Fourier Transform (DFT) for observations.
Qichen Xie +5 more
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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
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Wake-Responsive AUV Guidance Assisted by Passive Sonar Measurements
Journal of Marine Science and EngineeringTo make an Autonomous Underwater Vehicle (AUV) chase a moving target ship that generates wake, wake-responsive guidance can be used. This scenario is applicable to making an underwater torpedo pursue a moving target ship until hitting the target.
Jonghoek Kim
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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
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Research advances and development trends in acoustic target detection
Zhongguo Jianchuan YanjiuUnderwater target detection faces severe challenges due to the enhanced acoustic stealth capabilities of targets and the anomalous sound propagation phenomena within complex ocean waveguides.
Yixin YANG +5 more
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Null Broadening Beamforming for Passive Sonar Based on Weighted Similarity Vector
Journal of Marine Science and Engineering, 2023 Beamforming technology is very important for passive sonar to detect targets. However, the performance of a beamformer is seriously degraded in practical applications due to the complex and changeable underwater environment.
Yuhao Wang, Zhenkai Zhang
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Ecography, EarlyView.Correlative species distribution models (SDMs) are quantitative tools in biogeography and macroecology. Building upon the ecological niche concept, they correlate environmental covariates to species presence to model habitat suitability and predict species distributions.
Moritz Klaassen +3 more
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