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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Design of 35 GHz Gyrotron for Material Processing Applications
TL;DR: In this article, the complete design of a 35GHz, 200kW gyrotron for various material processing and heating applications is presented, including magnetron injection gun, interaction cavity, collector and RF window.
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The ERS-1 microwave radiometer
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Passive 77 GHz millimeter-wave sensor based on optical upconversion
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TL;DR: A passive millimeter-wave sensor operating at a frequency of 77 GHz is built and characterized, and Representative images are shown that demonstrate the phenomenology associated with this spectrum.
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Stratospheric and mesospheric latitudinal water vapor distributions obtained by an airborne millimeter‐wave spectrometer
TL;DR: In the last 3 years, several flights from polar regions (Spitzbergen, 78°N), to the subtropics (Cap Verde Islands, 16°N) have been performed with the Airborne Millimeter and Submillimcter-Wave Observing System aboard a Learjet of the Swiss Air Force as mentioned in this paper.
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Validation of middle-atmospheric campaign-based water vapour measured by the ground-based microwave radiometer MIAWARA-C
Brigitte Tschanz,Brigitte Tschanz,Corinne Straub,Dominik Scheiben,Dominik Scheiben,Kaley A. Walker,Gabriele Stiller,Niklaus Kämpfer,Niklaus Kämpfer +8 more
TL;DR: MIAWARA-C is a ground-based microwave radiometer for middle-atmospheric water vapour designed for use on measurement campaigns for both atmospheric case studies and instrument intercomparisons as mentioned in this paper.
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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