Results 1 to 10 of about 3,417 (148)

Surface atmospheric duct over Svalbard, Arctic, related to atmospheric and ocean conditions in winter

open access: yesArctic, Antarctic, and Alpine Research, 2022
Atmospheric ducts could disturb radar detection and radio communication in the Arctic and risk increasing human activities under Arctic warming. It is an urgent need to understand atmospheric ducts in the Arctic, with distinct atmospheric systems and ...
Jinhuan Zhu   +6 more
doaj   +4 more sources

Validation of atmospheric evaporation duct in the eastern Indian Ocean

open access: yesFrontiers in Earth Science
An atmospheric duct is an anomalous atmospheric structural phenomenon that causes trap refraction in the troposphere to change the propagation paths and ranges of electromagnetic waves, thereby increasing the detection distances of radar and other ...
Zhe Qi   +6 more
doaj   +4 more sources

A Classifying-Inversion Method of Offshore Atmospheric Duct Parameters Using AIS Data Based on Artificial Intelligence

open access: yesRemote Sensing, 2022
Atmospheric duct parameters inversion is an important aspect of microwave-band radar and communication system performance evaluation. AIS (Automatic Identification System) is one of the signal sources used for atmospheric duct parameters inversion ...
Jie Han   +7 more
doaj   +3 more sources

Weight Loss Function for the Cooperative Inversion of Atmospheric Duct Parameters

open access: yesAtmosphere, 2022
Low-altitude atmospheric ducts are abnormal atmospheric phenomena in the troposphere, impacting the operation of microwave or ultrashort wave radio systems.
Jie Han   +7 more
doaj   +3 more sources

Comparative Analysis of Intelligent Optimization Algorithms for Atmospheric Duct Inversion Using Automatic Identification System Signals

open access: yesRemote Sensing, 2023
Using intelligent optimization algorithms to retrieve atmospheric duct parameters by monitoring automatic identification system (AIS) signals at sea is a new passive remote sensing technology for atmospheric ducts.
Li-Feng Huang   +7 more
doaj   +3 more sources

Experimental Analysis of Atmospheric Ducts and Navigation Radar Over-the-Horizon Detection

open access: yesRemote Sensing, 2022
Since the height of sea detection radar antenna and ship targets is relatively low, it is generally believed that its over-the-horizon detection is mainly caused by the evaporation duct at sea.
Li-Feng Huang   +7 more
doaj   +2 more sources

Atmospheric Ducts and Their Electromagnetic Propagation Characteristics in the Northwestern South China Sea

open access: yesRemote Sensing, 2023
The propagation of electromagnetic waves beyond the line of sight can be caused by atmospheric ducts, which are significant concerns in the fields of radar and communication.
Ning Yang, Debin Su, Tao Wang
doaj   +2 more sources

Analysis and avoidance method of 5G atmospheric duct interference

open access: yesDianxin kexue, 2022
Atmospheric duct effects can produce the remote interference, which will lead to serious problems of the network degradation.Firstly, a detailed analysis of the causes of 5G atmospheric duct interference was achieved through the system principle analysis.
Tinglan WANG   +3 more
doaj   +3 more sources

Analysis and testing on the interference due to atmospheric duct of 5G

open access: yesDianxin kexue, 2022
Abstact: 5G (time division duplexing, TDD) system will be effected by the interference from 5G system due to atmospheric duct.The risk and current situation of 5G system in 2.6 GHz band were introduced and the interference characteristics of 5G ...
Xingang SONG   +3 more
doaj   +3 more sources

A Random Forest Algorithm Combined with Bayesian Optimization for Atmospheric Duct Estimation

open access: yesRemote Sensing, 2023
Inversion of atmospheric ducts is of great importance in the field of performance evaluation for radar and communication systems. Since the model parameters in machine learning play a crucial role in prediction performance, this paper develops a random ...
Chao Yang   +4 more
doaj   +3 more sources

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