Results 1 to 10 of about 9,221 (119)

Underwater acoustic metamaterials [PDF]

National Science Review, 2023
Erqian Dong, Peizheng Cao, Sai Zhang
exaly   +2 more sources

Ultra Low Frequency Wave Produced by Underwater Oscillating Sphere and Its Measurement

Journal of Marine Science and Engineering, 2021
When an underwater target moves in viscous fluid, it may cause the periodic movement of the surrounding fluid and generate ultra-low-frequency (ULF) gravity waves.
Huan Wang, Erzheng Fang, Mingze Wu, Lianjin Hong, Zongru Li   +4 more
doaj   +1 more source

A Low Frequency Noise Source Localization and Identification Method Based on a Virtual Open Spherical Vector Microphone Array

Applied Sciences, 2023
Aiming at the problem of poor spatial resolution of low-frequency noise sources in a small-aperture spherical microphone array (SMA), this paper proposes a method for localizing and identifying low-frequency noise sources based on virtual-vector open SMA
Boquan Yang, Yuan Gao, Qiang Guo, Shengguo Shi   +3 more
doaj   +1 more source

A Sparse Bayesian Learning Method for Direction of Arrival Estimation in Underwater Maneuvering Platform Noise

Journal of Marine Science and Engineering, 2023
The underwater maneuvering platform generates self-noise when sailing, which shows spatial directionality to the arrays fixed on the platform. In this paper, it is called spatially colored noise (SCN).
Yan Wang, Lei Zhao, Longhao Qiu, Jinjin Wang, Chenmu Li   +4 more
doaj   +1 more source

Analysis of Underwater Acoustic Propagation under the Influence of Mesoscale Ocean Vortices

Journal of Marine Science and Engineering, 2021
Mesoscale ocean vortices are common phenomenon and fairly distributed over the global oceans. In this study, mesoscale vortex in the South China Sea is identified by processing of AIPOcean data.
Sartaj Khan, Yang Song, Jian Huang, Shengchun Piao   +3 more
doaj   +1 more source

Spatial focusing algorithm for source enumeration with rotating uniform circular sonar arrays

IET Radar, Sonar & Navigation, 2023
Source enumeration with large snapshots is feasible for a static uniform circular sonar array (UCSA). However, the dimension of the signal subspace in the array coordinate system exceeds the number of signal sources due to the rotation of the UCSA, which
Guolong Liang, Guolong Liu, Yu Hao, Nan Zou, Chunpeng Zhao   +4 more
doaj   +1 more source

An Improved Azimuth Angle Estimation Method with a Single Acoustic Vector Sensor Based on an Active Sonar Detection System

Sensors, 2017
In this paper, an improved azimuth angle estimation method with a single acoustic vector sensor (AVS) is proposed based on matched filtering theory. The proposed method is mainly applied in an active sonar detection system.
Anbang Zhao, Lin Ma, Xuefei Ma, Juan Hui
doaj   +1 more source

A Conformal Driving Class IV Flextensional Transducer

Sensors, 2018
Class IV Flextensional Transducers (FTs) are the most popular among various FTs used as low-frequency and high power underwater acoustic sources. However, an undeniable fact exists in Class IV FTs is that the resonance frequency of breathing mode ...
Tianfang Zhou, Yu Lan, Qicheng Zhang, Jingwen Yuan, Shichang Li, Wei Lu   +5 more
doaj   +1 more source

An Improved Aerial Target Localization Method with a Single Vector Sensor

Sensors, 2017
This paper focuses on the problems encountered in the actual data processing with the use of the existing aerial target localization methods, analyzes the causes of the problems, and proposes an improved algorithm.
Anbang Zhao, Xuejie Bi, Juan Hui, Caigao Zeng, Lin Ma   +4 more
doaj   +1 more source

Self-Interference Suppression of Unmanned Underwater Vehicle with Vector Hydrophone Array Based on an Improved Autoencoder

Journal of Marine Science and Engineering, 2023
The self-interference of an unmanned underwater vehicle (UUV) weakens its ability to detect targets of interest. Due to limitations in the size of the sonar array and the complexity of the interference, the performance of existing self-interference ...
Jin Fu, Wenfeng Dong, Longhao Qiu, Chunpeng Zhao, Zherui Wang   +4 more
doaj   +1 more source