Results 21 to 30 of about 705,367 (158)
Variation of Electron Density in the D-Region Using Kunming MF Radar under Low Solar Activity
Atmosphere, 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
A radiowave propagation data acquisition system [PDF]
, 1978 Hardware and software for a computer controlled radiowave propagation data acquisition system is described.Prepared for: Naval Undersea Weapons Engineering Station, Keyport, Washington 98345 -- Cover.http://archive.org/details ...
Knorr, Jeffrey B.
core +1 more source
Atmosphere, 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
Wideband limitations of ray-optical techniques in radiowave propagation prediction
, 1997 Wideband channel response errors occur when the frequency variation associated with diffraction and reflection coefficients is neglected in determining radiowave propagation based on ray-optical techniques.
Constantinou, C.C.; id_orcid +1 more
core +3 more sources
A dual channel radiowave propagation data acquisition and transition system [PDF]
, 1979 Hardware and software for a dual channel aata radiowave propagation acquisition and transmission system is described.supported by the Naval Undersea Weapons Engineering Station (Code 8013B), Keyport, Washington.NAPrepared for: Naval Undersea Weapons ...
Knorr, Jeffrey B.
core +1 more source
Atmosphere, 2023 Gravity wave (GW) activities play a prominent role in the complex coupling process of wave–wave and wave–background circulation around mid-low-latitude and equatorial areas.
Na Li +5 more
doaj +1 more source
An Overview of Machine Learning Techniques for Radiowave Propagation Modeling
, 2021 We give an overview of recent developments in the modeling of radiowave propagation, based on machine learning algorithms. We identify the input and output specification and the architecture of the model as the main challenges associated with machine ...
Sarris, Costas D. +3 more
core +1 more source
Machine-Learning-Based GNSS Signal Anomaly Classification Using COSMIC-2 POD Data
Remote SensingIonospheric scintillation and radio frequency interference (RFI) affect Global Navigation Satellite System (GNSS) signals, making their distinction important for ionospheric monitoring and interference detection.
Ziming Liang +8 more
doaj +1 more source
Influences of the state of ionospheric background on ionospheric heating effects
Annals of Geophysics, 2014 According to the well-performed ionospheric heating experiments at Arecibo in the low latitudes as well as at Tromsø in the high latitudes, the large-scale modification effects are simulated under an assumption of equivalent conditions, i.e., with the ...
Shuji Hao +6 more
doaj +1 more source
Analysis of inversion error characteristics of stellar occultation simulation data
Earth and Planetary Physics, 2022 Atmospheric stellar occultation observation technology is an advanced space-based detection technology that can measure the vertical distribution of trace gas composition, temperature, and aerosol content in a planet’s atmosphere.
MingChen Sun +3 more
doaj +1 more source