Results 61 to 70 of about 678 (183)

Miniaturisation of high‐frequency SURFACE wave radar transmitting antenna

open access: yesThe Journal of Engineering, Volume 2019, Issue 19, Page 6222-6225, October 2019., 2019
Antennas operating in the high‐frequency (HF) bands are generally relatively large in size, which severely limits the application of the antennas. Therefore, miniaturisation of the antenna is necessary. Here, a dual‐folded structure Yagi antenna is designed for HF surface wave radar (SWR).
Hong‐Bo Li, Yang Song, Chang‐Jun Yu
wiley   +1 more source

Design of direct wave cancellation system for high‐frequency CW radar

open access: yesThe Journal of Engineering, Volume 2019, Issue 20, Page 6660-6663, October 2019., 2019
When high‐frequency continuous wave (HFCW) radars transmit linear frequency modulated (LFM) continuous wave, there will be direct wave (DW) interference due to temporal continuity. In order to prevent receiver saturation, a DW cancellation system device is developed.
Nan Shang   +3 more
wiley   +1 more source

Space-time Characteristics and Experimental Analysis of Broadening First-order Sea Clutter in HF Hybrid Sky-surface Wave Radar [PDF]

open access: yes, 2014
In high frequency (HF) hybrid sky-surface wave radar, the first-order sea clutter broadening is very complex and serious under the influence of ionosphere and bistatic angle, which affects the detection of ship target.
Chu, T.Q.   +4 more
core   +1 more source

Sky and ground - wave high frequency (HF) radars: challenges in modelling, simulation and application preface [PDF]

open access: yes, 2010
Radar systems operating at high frequency (HF) are able to exploit a variety of propagation mechanisms to achieve line-of-sight (LOS) illumination as well as over-the-horizon coverage, thereby providing many opportunities for long range, wide area multi ...
Sevgi, Levent
core  

Surveillance et contrôle des activités des navires en mer (REE nov. 2007) [PDF]

open access: yes, 2007
Dossier : La sécurité globale. Menaces et réponses. Article disponible sur cette page = http://www.irit.fr/scanmaris/index.php?page=publicationsNational audienceTo guarantee good security conditions in the French national water and exclusive economic ...
Alhadef, Bernard   +9 more
core   +2 more sources

3-D Moving Target Localization in Multistatic HFSWR: Efficient Algorithm and Performance Analysis

open access: yesRemote Sensing
High-frequency surface wave radar (HFSWR) is unable to measure the target’s altitude information due to its limited antenna aperture in the elevation dimension.
Xun Zhang   +3 more
doaj   +1 more source

Editorial for the Special Issue "Remote Sensing of Target Detection in Marine Environment" [PDF]

open access: yes, 2019
First paragraph: Remote sensing is a powerful tool used to obtain an unprecedented amount of information about the ocean from a distance, usually from satellites or aircrafts. Measurements collected by active and passive remote sensing instruments can be
Marino, Armando   +2 more
core   +2 more sources

System for surveillance of maritime traffic using the network of over-the-horizon radars [PDF]

open access: yes, 2021
Ova disertacija se bavi optimizacijom i prilagođenjem algoritama za praćenje ciljeva za potrebe ublažavanja uticaja štetnih refleksija na proces praćenja ciljeva kod izahorizontskih radara sa površinskim talasom (HFSW radari), upotrebljenih za osmatranje
Stojković, Nikola
core  

Extraction of Suspicious Behavior of Vessels in the Exclusive Economic Zone [PDF]

open access: yes, 2008
Available: http://ap-s.ei.tuat.ac.jp/isapx/2008/pdf/1645005.pdfInternational audienceIntroduction: Constant growth of world maritime transport and significant economic stakes of territorial water management have prompted the international community to ...
Giraud, Marie-Anne   +5 more
core   +1 more source

Typhoon Early Warning and Monitoring Based on the Comprehensive Characteristics of Oceanic and Ionospheric Echoes from HFSWR: The Case of Typhoon Muifa

open access: yesRemote Sensing
As devastating natural disasters, typhoons pose a tremendous threat to human society, making effective typhoon early warning and monitoring crucial.
Menghua Jiang   +4 more
doaj   +1 more source

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