Results 51 to 60 of about 1,913,452 (223)

Estudo e desenvolvimento de algoritmos de sonar ativo para o mapeamento de áreas submersas [PDF]

, 2015
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2015.Recentes avanços no cenário marítimo brasileiro - como a descoberta e exploração do pré-sal e a ...
Ristow, João Paulo
core  

Use of multibeam imaging sonar for observation of marine mammals and fish on a marine renewable energy site.

PLoS ONE, 2022
Environmental data is crucial for planning, permitting, execution and post construction monitoring of marine renewable energy projects. In harsh conditions in which marine renewable energy is harvested, integrated monitoring platforms comprising ...
Francisco Francisco, Anke Bender, Jan Sundberg   +2 more
doaj   +1 more source

Design and Testing of a Minimal Configuration Underwater Micro‐Glider: Automating Lake and Reservoir Monitoring

Journal of Field Robotics, EarlyView.
ABSTRACT Uncrewed underwater vehicles (UUVs) have transformed oceanographic research through autonomous data gathering. Similarly, lake and other aquatic research can potentially be automated and transformed. However, UUVs would need to be smaller, lighter, less complex, and cheaper than currently available to make them more practical and user‐friendly
James M Rand, Alan Hunter, Danielle Wain, Lee D Bryant   +3 more
wiley   +1 more source

An omega‐k algorithm for multireceiver synthetic aperture sonar

Electronics Letters, 2023
In this Letter, the authors present a novel imaging algorithm for multireceiver synthetic aperture sonar (SAS). The Loffeld's bistatic formula (LBF) including quasi‐monostatic (QM) and multireceiver deformation (MD) phases is first reformulated into ...
Xuebo Zhang, Peixuan Yang, Haixin Sun
doaj   +1 more source

Effectiveness Assessment of Underwater Area Cruise Based on the ADC Method

Journal of Field Robotics, EarlyView.
ABSTRACT Underwater area surveillance plays a crucial role in upholding national security, safeguarding strategic interests, and mitigating potential threats. Despite its significance, a notable gap persists in the availability of comprehensive models for assessing its effectiveness.
Qingwei Liang, Yuxin Lin, Mingyang Luo, Zhanghong Zeng   +3 more
wiley   +1 more source

On the Information Advantage of Sidescan Sonar Three-Frequency Colour over Greyscale Imagery

Journal of Marine Science and Engineering, 2019
A prototype three-frequency (114, 256, and 410 kHz) colour sidescan sonar system, built by Kongsberg Underwater Mapping Ltd. (Great Yarmouth, UK), was previously described, and preliminary results presented, in Tamsett, McIlvenny, and Watts.
Duncan Tamsett, Jason McIlvenny, James Baxter, Paulo Gois, Benjamin Williamson   +4 more
doaj   +1 more source

FLSea: Underwater Visual–Inertial and Stereovision Forward‐Looking Data Sets

Journal of Field Robotics, EarlyView.
ABSTRACT Visibility underwater is challenging and degrades as the distance between the subject and the camera increases. That is why forward‐looking underwater computer vision tasks are difficult. We have collected underwater forward‐looking stereovision and visual–inertial image sets using two underwater imaging platforms, a stereo camera rig, and an ...
Yelena Randall, Ori Lifschitz, Tali Treibitz   +2 more
wiley   +1 more source

A risk function for behavioral disruption of Blainville’s beaked whales (Mesoplodon densirostris) from mid-frequency active sonar [PDF]

, 2014
There is increasing concern about the potential effects of noise pollution on marine life in the world’s oceans. For marine mammals, anthropogenic sounds may cause behavioral disruption, and this can be quantified using a risk function that relates sound
Ashley Dilley, Neales, Bert, Jarvis, S, Thomas Len, Bert Neales, Dilley, Ashley, Harwood John, McCarthy, Elena, Jessica Shaffer, New, Leslie, Morrissey, Ronald, Moretti David, Leslie New, Marques, Tiago A., Moretti, David, Shaffer Jessica, Harwood, John, John Harwood, Marques, Tiago, Neales Bert, David Moretti, Susan Jarvis, Shaffer, Jessica, Morrissey Ronald, Tiago Marques, New Leslie, Mccarthy, E, Morrissey, Ron, Ronald Morrissey, Jarvis Susan, New, Leslie Frances, Len Thomas, Marques Tiago, Dilley Ashley, Elena McCarthy, Jarvis, Susan, McCarthy Elena, Thomas, Len, Thomas, Len; id_orcid, Marques, Tiago A.; id_orcid   +39 more
core   +2 more sources

Formation Control With Obstacle Avoidance of Underwater Swarms Based on Relative Visual Feedback

Journal of Field Robotics, EarlyView.
ABSTRACT Underwater multi‐robot and swarm systems require advanced methodologies for controlling collective behavior. Conventional single‐robot techniques, such as tethering, sonar imaging, and acoustic localization, are not scalable or effective for swarm applications.
Andrea Infanti, Saverio Iacoponi, Saif Alameri, Mohamed El Hanbaly, Mohammed Tarnini, Cesare Stefanini, Giulia De Masi, Federico Renda   +7 more
wiley   +1 more source

Target discrimination in bubbly water

, 2012
A man-made sonar that can operate in bubbly water is relevant: decades of active sonar experience built up for deep water applications are insufficient for shallow water operations required of a changed maritime security landscape.
Chua, Gim Hwa
core   +1 more source