Results 1 to 10 of about 378,205 (161)

Weighted Mean Annual Rain Height Applied to Rain Attenuation Prediction on Earth-Space Links

open access: yesInternational Journal of Antennas and Propagation, 2022
Rain height is crucial for rain attenuation prediction along slant paths, such as Earth-space links. The global digital map of the mean annual rain height is given in Recommendation ITU-R P.839-4.
Leke Lin   +6 more
doaj   +1 more source

Assessing the impact of wildfires on water quality using satellite remote sensing: the Lake Baikal case study

open access: yesFrontiers in Remote Sensing, 2023
Lakes have been observed as sentinels of climate change. In the last decades, global warming and increasing aridity has led to an increase in both the number and severity of wildfires.
Monica Pinardi   +8 more
doaj   +1 more source

An Effective Method for Electromagnetic Parameter Measurement of Flexible Materials Based on Air Coaxial Line

open access: yesInternational Journal of Antennas and Propagation, 2022
When measuring the electromagnetic parameters of flexible material with an air coaxial line, the specimen is prone to bend and deform in the fixture, which results in erroneous results.
Jinjing Ren   +2 more
doaj   +1 more source

24 GHz FMCW MIMO Radar for Marine Target Localization: A Feasibility Study

open access: yesIEEE Access, 2022
Radar detection and tracking of targets in the marine environment are common tasks performed to ensure the safe navigation of ships or monitor traffic in harbor areas.
Gianluca Gennarelli   +5 more
doaj   +1 more source

A Prediction Method of Electromagnetic Environment Effects for UAV LiDAR Detection System

open access: yesComplexity, 2021
With the rapid development of science and technology, UAVs (Unmanned Aerial Vehicles) have become a new type of weapon in the informatization battlefield by their advantages of low loss and zero casualty rate.
Min Huang   +5 more
doaj   +1 more source

An Ultra-Wideband Vivaldi Antenna System for Long-Distance Electromagnetic Detection

open access: yesApplied Sciences, 2022
Enlarging or reducing the antenna beam width of antennas can improve the positioning capability of detection systems. A miniaturized and easily fabricated ultra-wideband (UWB) antenna system for long-distance electromagnetic detection is proposed in this
Jinjing Ren   +5 more
doaj   +1 more source

ELF/VLF Wave Radiation Experiment by Modulated Ionospheric Heating Based on Multi-Source Observations at EISCAT

open access: yesAtmosphere, 2022
Ground-based high-frequency modulated waves can periodically heat the ionosphere and create “virtual antennas”, which can radiate extremely low frequency (ELF, 0.3–3 kHz) or very low frequency (VLF, 3–30 kHz) waves for long-distance communication ...
Jing Chen   +10 more
doaj   +1 more source

A New SLF/ELF Algorithm of Fields Excited by a Radiator in a Soil Foundation in the Earth–Ionosphere Cavity

open access: yesAtmosphere, 2023
Abnormal electromagnetic radiation associated with seismic activity has been reported across a wide range of frequencies, but its primary energy is concentrated in the super-low-frequency (SLF) and extremely low-frequency (ELF) bands.
Yuanxin Wang   +5 more
doaj   +1 more source

Mapping spatial distribution of crop residues using PRISMA satellite imaging spectroscopy

open access: yesEuropean Journal of Remote Sensing, 2022
Non-photosynthetic vegetation (NPV) plays a key role in soil conservation, which in turn is important in sustainable agriculture and carbon farming. For mapping NPV image spectroscopy proved to outperform multispectral sensors.
Monica Pepe   +4 more
doaj   +1 more source

Variation of Electron Density in the D-Region Using Kunming MF Radar under Low Solar Activity

open access: yesAtmosphere, 2023
So far, the least is known about the D-region ionosphere out of the entire ionosphere due to the lack of a conventional detecting method and continuous data accumulation. Medium frequency (MF) radar is an important conventional tool for understanding the
Zhimei Tang   +6 more
doaj   +1 more source

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