Results 21 to 30 of about 1,058 (187)

Research on the Ambiguity Function Characteristics of Uniform Circular Frequency Diverse Array Sonar

Journal of Marine Science and Engineering
The existing research on frequency diverse arrays (FDAs) predominantly concentrates on narrowband uniform linear frequency diverse arrays (ULFDAs). The uniform circular array presents advantages, such as a small aperture and omnidirectional scanning.
Weiye Liu, Yixin Yang
doaj   +1 more source

Direction of Arrival Estimation of Acoustic Sources with Unmanned Underwater Vehicle Swarm via Matrix Completion

Remote Sensing, 2022
With the rapid development of vibration and noise reduction technologies, underwater target detection is facing great challenges. Particularly, the task of high-resolution direction of arrival (DOA) estimation with sonar array is becoming more and more ...
Liya Xu, Jianjun Huang, Hao Zhang, Bin Liao   +3 more
doaj   +1 more source

Comparative Analysis of SVM and CNN for Sonar Signal Classification Using Sparse Arrays

IEEE Access
Coprime and nested sparse arrays are two widely researched sparse arrays. These arrays, requiring fewer sensors compared to full uniform linear arrays (ULAs), still have a high number of degrees of freedom.
Showrov Rahman, Kaushallya Adhikari
doaj   +1 more source

Review on Nested Array Design Research [PDF]

Hangkong bingqi
Array signal processing is an important branch of signal processing, which is widely used in radar, sonar and wireless communication. Direction of arrival estimation, as one of its key applications, traditionally relies on the layout of uniform linear ...
Mao Yanyuan, Ma Wanyu, Si Weijian
doaj   +1 more source

A Comparison of Faulty Antenna Detection Methodologies in Planar Array

Applied Sciences, 2023
Broadcasting, radar, sonar and space telecommunication systems use phased arrays to produce directed signals to be transmitted at the desired angle. This system requires a large number of antenna elements.
Navaamsini Boopalan, Agileswari K. Ramasamy, Farrukh Nagi   +2 more
doaj   +1 more source

Designing Wire Mazes for Replicating Natural Echoes to Study Bat Biosonar Function

Advanced Intelligent Systems, EarlyView.
A validated framework combining efficient physical modeling (multiple scattering model) and deep learning is presented to guide wire‐maze design for bat biosonar studies. This approach rapidly generates large datasets to test acoustic distinguishability among wire arrangements.
Chunlin Jia, Gengkai Hu, Boo Cheong Khoo, Rolf Müller   +3 more
wiley   +1 more source

Optimizing Strategies for Non‐Invasive Prospection of Settlements in the Intertidal Zone: A Case Study From the Centre of the Drowned Medieval Village of Tolsende (Scheldt Estuary, the Netherlands)

Archaeological Prospection, EarlyView.
ABSTRACT Medieval and early modern drowned villages in the intertidal zone of the Scheldt estuary (the Netherlands) constitute intriguing yet largely understudied components of north‐western Europe's underwater cultural heritage. Despite their high archaeological potential as time capsules of past settlement landscapes, research has remained limited ...
Jan Trachet, Sarah Bäumler, Stefan Krojer, Jeroen Verhegge, Wim De Clercq, Philippe De Smedt, Wouter H. Maes, Bente S. Majchczack, Immo Trinks, Dennis Wilken   +9 more
wiley   +1 more source

A miniaturized acoustic vector sensor with PIN-PMN-PT single crystal cantilever beam accelerometers

Acta Acustica, 2020
Directional sound detection using vector sensors rather than large hydrophone arrays is highly advantageous for target detection in SONAR. However, developing highly sensitive and compact vector sensors for use in a system whose size is limited has been ...
Cho Yohan, Je Yub, Jeong Weui-Bong
doaj   +1 more source

Scanning Parametric Sediment Echosounder as Tool for Underwater Archaeological Prospection

Archaeological Prospection, EarlyView.
ABSTRACT Underwater cultural heritage 3D prospection techniques, especially for remains that are partly buried in the ground, are only very rarely available and often can only be applied with considerable technical effort. To overcome this limitation, we evaluate a methodological adaption of widely used and available single channel parametric sediment ...
Dennis Wilken, Philipp Held, Jacob Geersen, Marcel Bradtmöller, Peter Feldens, Jens Schneider v. Deimling   +5 more
wiley   +1 more source

Optimization Method for Wide Beam Sonar Transmit Beamforming

Sensors, 2022
Imaging and mapping sonars such as forward-looking sonars (FLS) and side-scan sonars (SSS) are sensors frequently used onboard autonomous underwater vehicles.
Louise Rixon Fuchs, Atsuto Maki, Andreas Gällström   +2 more
doaj   +1 more source