Results 21 to 30 of about 3,985 (273)
IEEE AccessThis paper proposes a real-time prediction of the duct using a refractivity from clutter (RFC) method based on genetic algorithm (GA) and the parabolic equation (PE) method.
Jun Heo +4 more
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An Improved Remote Sensing Retrieval Method for Elevated Duct in the South China Sea
Remote SensingElevated duct is an atmospheric structure characterized by abnormal refractive index gradients, which can significantly affect the performance of radar, communication, and other systems by capturing a portion of electromagnetic waves. The South China Sea
Yinhe Cheng +7 more
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An atmospheric refractivity inversion method based on deep learning
Results in Physics, 2019 An atmospheric refractivity inversion method based on deep learning is introduced. Atmospheric duct is an anomalous phenomenon of electromagnetic waves in the atmosphere that affects the use of radio equipment, obtaining real-time atmospheric duct ...
Wenlong Tang +4 more
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Haiyang Kaifa yu guanliOcean waveguides are important channel resources and mechanisms for geodesy, military oceanography, and also oceanic and climatic environmental changes. This paper focuses on the ocean waveguides environment, with marine atmospheric duct as the entry and
QI Qinghua
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Deep learning for classifying and characterizing atmospheric ducting within the maritime setting [PDF]
Computers & Geosciences, 2021 Real-time characterization of refractivity within the marine atmospheric boundary layer can provide valuable information that can potentially be used to mitigate the effects of atmospheric ducting on radar performance. Many duct characterization models are successful at predicting parameters from a specific refractivity profile associated with a given ...
Hilarie Sit, Christopher J. Earls
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A Sliced Parabolic Equation Method to Characterize Maritime Radio Propagation
Sensors, 2023 For maritime broadband communications, atmospheric ducts can enable beyond line-of-sight communications or cause severe interference. Due to the strong spatial–temporal variability of atmospheric conditions in near-shore areas, atmospheric ducts have ...
Yuzhen Wang +3 more
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Low-Level Atmospheric Ducts [PDF]
Nature, 1948 DURING 1943-46, the Signals Research and Development Establishment operated a series of experimental centimetre-wave radio links along a 60-mile oversea path across Cardigan Bay. One major purpose of the investigation, which was carried out for an inter-Service committee under the chairmanship of Sir Edward Appleton, was to determine the degree to ...
J. S. MCPETRIE, B. STARNECKI
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Low-Level Atmospheric Ducts [PDF]
Nature, 1949 IN a communication in Nature1, I suggested an explanation for the occurrence of low-level atmospheric ducts over the sea, which had been reported by McPetrie and Starkey2 in conditions of strong winds. It was suggested that the previous history of the air was the governing factor in deciding whether an atmospheric duct would occur. I am indebted to Dr.
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Dianxin kexue, 2022 Atmospheric duct interference is a seriousinternal interference of large-scale TDD wireless communication system according to specific meteorological conditions.The causes and classification of the atmospheric duct interference were analyzed firstly.Then
Xiaoyun WANG +4 more
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Journal of Marine Science and Engineering, 2023 Atmospheric ducts are special super-refractive atmospheric structures that can cause over-the-horizon propagation of electromagnetic waves. Different types of atmospheric ducts have different influences on electromagnetic wave propagation.
Yang Shi +3 more
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