Results 91 to 100 of about 23,037 (220)

Hybrid Log-Mel and HPSS-Aided Convolutional Neural Network for Underwater Very-Low-Frequency Remote Passive Sonar Detection

Journal of Marine Science and Engineering
Very-low-frequency (VLF) passive sonar detection is one of the core technologies for maritime surveillance, although its performance is often severely affected by strong impulsive ocean ambient noise interference. This paper, for the first time, proposes
Haitao Dong, Lijian Yang, Yuan Liu, Siyuan Li   +3 more
doaj   +1 more source

Preprocessing passive sonar signals for neural classification

IET Radar, Sonar & Navigation, 2011
The noise radiated from ships in the ocean contains information about their machinery and can be used for detection and identification purposes. Here, a preprocessing method is developed in order to improve the performance of a feedforward neural network, which is used to classify four classes of ships.
W.S. Filho, J.M. de Seixas, N.N. de Moura   +2 more
openaire   +1 more source

Seafloor mapping in the Arctic: support for a potential U.S. extended continental shelf [PDF]

, 2010
For the United States, the greatest opportunity for an extended continental shelf under UNCLOS is in the ice-covered regions of the Arctic north of Alaska.
Armstrong, Andy, Calder, Brian R., Gardner, James V., Mayer, Larry A.   +3 more
core   +2 more sources

Fish tracking technology development. Phase 1 project definition desk study [PDF]

, 1994
The document reports on Phase 1 of a definition study to appraise the options to develop fish tracking equipment, in particular tags and data logging systems in order to improve the efficiency of the Environment Agency's tracking studies and to obtain a ...
Moore, A, Potter, E.C.E.
core  

A Dynamic Evaluation Method for Collaborative Search Efficiency of Multi-Sonar Systems Under Uncertain Situations

Applied Sciences
In sonar collaborative search tasks, effectively evaluating the collaborative search efficiency is an important way to measure whether a task can be successful, which can also provide strong support for optimizing search schemes.
Shizhe Wang, Weiyi Chen, Zongji Li, Xu Chen   +3 more
doaj   +1 more source

Acoustical characteristic predictions of a multi-layer system of a submerged vehicle hull mounted sonar simplified to an infinite planar model

International Journal of Naval Architecture and Ocean Engineering, 2012
Hull Mounted Sonar (HMS) is a long range submerged vehicle's hull-mounted passive sonar system which detects low-frequency noise caused by machineries of enemy ships or submerged vehicles.
Sung-Hee Kim, Suk-Yoon Hong, Jee-Hun Song, Hyun-Gwon Kil, Jae Jin Jeon, Young-Soo Seo   +5 more
doaj   +1 more source

Beyond the Chart: The use of Satellite Remote Sensing for Assessing the Adequacy and Completeness Information [PDF]

, 2012
Chart adequacy and completeness information consists of the symbols, abbreviations and warnings used to inform mariners of the level of confidence that should be given to data on a nautical chart.
Alexander, Lee, Armstrong, Andy, Azuike, Chukwuma, Parrish, Christopher, Pe\u27eri, Shachak   +4 more
core   +1 more source

Two-dimensional DOA estimation based on thin array towed by a small autonomous platform

Journal of Measurement Science and Instrumentation, 2021
The small autonomous platform with a thin line array is an important tool for underwater acoustic mobile surveillance. Generally, only one-dimensional（1-D） direction-of-arrival（DOA） of the source signal can be estimated using a thin towed line array.
JIANG Jiajia, YANG Guoliang, LI Chunyue, LI Yao, WANG Xianquan, SUN Zhongbo, DUAN Fajie, FU Xiao   +7 more
doaj  

The Rise of Certificate Transparency and Its Implications on the Internet Ecosystem

, 2018
In this paper, we analyze the evolution of Certificate Transparency (CT) over time and explore the implications of exposing certificate DNS names from the perspective of security and privacy.
Amann, Johanna, Brent, Lexi, Carle, Georg, Gasser, Oliver, Holz, Ralph, Nolte, Theodor, Scheitle, Quirin, Schmidt, Thomas C., Wählisch, Matthias   +8 more
core   +1 more source

A Fully Complex-Valued Underwater Acoustic Signal Enhancement Model for Passive Sonar Systems

IEEE Open Journal of Signal Processing
Passive sonar systems offer stealth and low-energy consumption advantages while facing highly complex signal conditions. Underwater acoustic signal (UWAS) enhancement for passive sonar systems aims to improve the quality of vessel-radiated signals ...
Zhengzhe Zhang, Jie Zhang, Haoyin Yan, Hengshuang Liu, Junhua Liu   +4 more
doaj   +1 more source