Journal ArticleDOI
MPM—An atmospheric millimeter-wave propagation model
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TLDR
In this paper, the authors characterized the neutral atmosphere for the frequency range from 1 to 300 GHz as a nonturbulent propagation medium and predicted attenuation and propagation delay effects from meteorological data sets: pressure, temperature, humidity, suspended particle concentration, and rain rate.Abstract:
The neutral atmosphere is characterized for the frequency range from 1 to 300 GHz as a nonturbulent propagation medium. Attenuation and propagation delay effects are predicted from meteorological data sets: pressure, temperature, humidity, suspended particle concentration, and rain rate. The physical data base of the propagation model consists of four terms: (a) resonance information for 30 water vapor and 48 oxygen absorption lines in the form of intensity coefficients and center frequency for each line; (b) a composite (oxygen, water vapor, and nitrogen) continuum spectrum; (c) a hydrosol attenuation term for haze, fog, ,and cloud conditions; and (d) a rain attenuation model. Oxygen lines extend into the mesosphere, where they behave in a complicated manner due to the Zeeman effect. The geomagnetic field strength H is required as an additional input parameter. Each 02 line splits proportionally with H into numerous, sub-lines, which are juxtaposed to form a Zeeman pattern spread over a megahertz scale. Patterns for three main polarization cases are calculated. Detailed examples for model atmospheres provide basic millimeter wave propagation information over the height range 0 to 100 km of the neutral atmosphere.read more
Citations
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Journal ArticleDOI
Improving atmospheric path attenuation estimates for radio propagation applications by microwave radiometric profiling
Ayham Alyosef,Domenico Cimini,Lorenzo Luini,Carlo Riva,Frank S. Marzano,M. Biscarini,Luca Milani,Antonio Martellucci,Sabrina Gentile,Saverio T. Nilo,Francesco Di Paola,Ayman Alkhateeb,Filomena Romano +12 more
TL;DR: In this paper, a linear regression algorithm is trained with a simulated dataset obtained by processing 1-year of radiosonde observations of atmospheric thermodynamic profiles, and the estimated TMR at the K and V-W band is compared with nearly colocated and simultaneous radiosondes.
Journal ArticleDOI
On the problem of high-accuracy modeling of the dry air absorption spectrum in the millimeter wavelength range
TL;DR: In this article, a detailed analysis of the dry air spectrum in the frequency range 180-260 GHz is given, and the contributions of monomolecular and bimolecular absorption are discussed.
Proceedings ArticleDOI
Flat-fade effects and millimetre-wave considerations in COST 235
TL;DR: In this paper, the authors describe the activities of Working Group 2 of COST Project 235 on radiowave propagation effects on next-generation fixed-services terrestrial telecommunications systems, including absorption and dispersion by atmospheric gases, attenuation and scattering by hydrometeors, especially by rain and the effects of atmospheric turbulence manifested in scintillation phenomena.
Journal ArticleDOI
Physics design of the in-vessel collection optics for the ITER electron cyclotron emission diagnostic
William L. Rowan,Saeid Houshmandyar,P. E. Phillips,Max E Austin,Joseph H. Beno,Amanda Hubbard,Andrei Khodak,Abdelhamid Ouroua,G. Taylor +8 more
TL;DR: Measurement of the electron cyclotron emission (ECE) is one of the primary diagnostics for electron temperature in ITER and in-vessel, in-vacuum, and quasi-optical antennas capture sufficient ECE to achieve large signal to noise with microsecond temporal resolution and high spatial resolution while maintaining polarization fidelity.
Proceedings ArticleDOI
Ultra wideband wireless satellite communications in the 94 GHz band
TL;DR: In this article, a space-frequency theory of the propagation of an ultra-wide band radiation in a inhomogeneous dielectric media is presented, where the atmospheric medium is characterized via its refractivity leading to a transfer function, which describes the changing response of the medium in the frequency domain.
References
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Journal ArticleDOI
The aR b relation in the calculation of rain attenuation
R. Olsen,D. Rogers,D. Hodge +2 more
TL;DR: In this paper, the empirical relation A = aR^{b} between the specific attenuation A and the rain rate R is used in the calculation of rain attenuation statistics.
Journal ArticleDOI
An updated model for millimeter wave propagation in moist air
TL;DR: In this article, a practical atmospheric millimeter-wave propagation model (MPM) is proposed to predict attenuation for dry air at 2.5-430 GHz. But the model is limited to frequencies below 300 GHz and the number of spectroscopic parameters can be reduced to less than 200.
Journal ArticleDOI
Electromagnetic wave propagation and scattering in rain and other hydrometeors
TL;DR: In this paper, the authors review the theories and results of numerical calculations of interactions between hydrometeors and microwaves or millimeter waves propagating in media containing these hydrometers.
Journal ArticleDOI
Millimeter-wave attenuation and delay rates due to fog/cloud conditions
TL;DR: In this paper, the propagation properties of suspended water and ice particles which make up atmospheric haze, fog, and clouds were examined for microwave and millimeter-wave frequencies, and the rates of attenuation alpha (dB/km) and delay tau (ps/km), derived from a complex refractivity based on the Rayleigh absorption approximation of Mie's scattering theory, were derived.
Journal ArticleDOI
Interference coefficients for overlapping oxygen lines in air
TL;DR: In this article, the interference coefficients were determined for the 5-mm wavelength oxygen lines broadened by air and solved by the Twomey-Tikhonov method, which minimizes a cost function, subject to the condition of constant measurement error variance.
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