Results 31 to 40 of about 4,800,869 (233)

Optimization of active sonar parameters in a measured environment

6th Underwater Acoustics Conference and Exhibition, 2021
Sonar operation in coastal waters is challenging due to high false alarm rates and strongly varying sonar conditions. Optimal choices for sonar design and pulse characteristics depend strongly on target location and velocity, as well as the present ...
K. Hjelmervik, E. M. Bøhler
semanticscholar   +1 more source

Empowering and conquering infirmity of visually impaired using AI‐technology equipped with object detection and real‐time voice feedback system in healthcare application

CAAI Transactions on Intelligence Technology, EarlyView., 2023
Abstract The Internet of Things is emerging as a crucial technology in aiding humans and making their lives easier. Among the human population, a large percentage of people suffer from disabilities resulting in challenges in everyday life particularly people with visual disabilities.
Hania Tarik, Shahzad Hassan, Rizwan Ali Naqvi, Saddaf Rubab, Usman Tariq, Monia Hamdi, Hela Elmannai, Ye Jin Kim, Jae‐Hyuk Cha   +8 more
wiley   +1 more source

Active ABF for sonar [PDF]

Proceedings of 27th Asilomar Conference on Signals, Systems and Computers, 2002
An adaptive beamforming (ABF) algorithm tailored for active sonar is described. It is especially suited for processing FM waveform received by a fixed or moving sensor array. Adaptation is confined to small windows of time whose duration is closely related to the range resolution of the FM ping.
openaire   +2 more sources

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, Norbert Hövelmann, Delf Sachau   +2 more
doaj   +1 more source

Study of reverberation pattern and its cancellation method in shallow water [PDF]

Theoretical and Applied Mechanics, 2007
In shallow water, the primary limitation of the performance of active sonar is the reverberation that originates from volume and boundaries scattering as well as multi-path propagation. There­fore, reverberation cancelation is an important research topic
Yang Shiuh-Kuang, Chiu Shih-Ming, Wei Ruey-Chang   +2 more
doaj   +1 more source

Advances In Active Sonar Tracking

, 2006
Publication in the conference proceedings of EUSIPCO, Florence, Italy ...
Stefano Coraluppi, Craig Carthel
openaire   +4 more sources

Investigation and Numerical Simulation of the Acoustic Target Strength of the Underwater Submarine Vehicle

Inventions, 2022
Modern weapon systems’ survival hinges on their detection capabilities more than anything else. In the active sonar equation, the acoustic target strength is crucial.
Kaveripakam Sathish, Rajesh Anbazhagan, Ravikumar Chinthaginjala Venkata, Fabio Arena, Giovanni Pau   +4 more
doaj   +1 more source

Active Sonar Target Classification with Power-Normalized Cepstral Coefficients and Convolutional Neural Network

Applied Sciences, 2020
Detection and classification of unidentified underwater targets maneuvering in complex underwater environments are critical for active sonar systems.
Seungwoo Lee, Iksu Seo, Jong-Hoon Seok, Yunsup Kim, D. Han   +4 more
semanticscholar   +1 more source

Zero-Shot Learning-Based Recognition of Highlight Images of Echoes of Active Sonar

Electronics
Reducing the impact of underwater disturbance targets and improving the ability to recognize real moving targets underwater are important directions of active sonar research.
Xiaochun Liu, Yunchuan Yang, Xiangfeng Yang, Liwen Liu, Lei Shi, Yongsheng Li, Jianguo Liu   +6 more
semanticscholar   +1 more source

Changes in the acoustic activity of beaked whales and sperm whales recorded during a naval training exercise off eastern Canada

Scientific Reports, 2022
Experimental research has shown that beaked whales exhibit strong avoidance reactions to naval active sonars used during antisubmarine warfare training exercises, including cessation of echolocation and foraging activity.
Joy E. Stanistreet, Wilfried A. M. Beslin, Katie Kowarski, S. Bruce Martin, Annabel Westell, Hilary B. Moors-Murphy   +5 more
doaj   +1 more source