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Title:
An updated model for millimeter wave propagation in moist air
Authors:
Liebe, H. J.
Affiliation:
AA(National Telecommunications and Information Administration, Institute for Telecommunication Sciences, Boulder, CO)
Publication:
Radio Science (ISSN 0048-6604), vol. 20, Sept.-Oct. 1985, p. 1069-1089. (RaSc. Homepage)
Publication Date:
10/1985
Category:
Communications and Radar
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTROSCOPY, ATMOSPHERIC ATTENUATION, ATMOSPHERIC MOISTURE, MICROWAVE ATTENUATION, MICROWAVE TRANSMISSION, MILLIMETER WAVES, ATMOSPHERIC MODELS, ATMOSPHERIC WINDOWS, OXYGEN SPECTRA, RADIO WAVE REFRACTION, SIGNAL DISTORTION, SPECTRAL LINE WIDTH, TIME LAG, WATER VAPOR
DOI:
10.1029/RS020i005p01069
Bibliographic Code:
1985RaSc...20.1069L

Abstract

A practical atmospheric Millimeter-Wave Propagation Model is formulated that predicts attenuation, delay, and noise properties of moist air for frequencies up to 1000 GHz. Input variables are height distributions (0-30 km) of pressure, temperature, humidity, and suspended droplet concentration along an anticipated radio path. Spectroscopic data consists of more than 450 parameters describing local O2 and H2O absorption lines complemented by continuum spectra for dry air, water vapor, and hydrosols. For a model limited to frequencies below GHz, the number of spectroscopic parameters can be reduced to less than 200. Recent laboratory measurements at 138 GHz absolute attenuation rates for simulated air with water vapor pressures up to saturation allow the formulation of an improved, though empirical water vapor continuum. Model predictions are compared with selected (2.5-430 GHz) data from both laboratory and field experiments. In general, good agreement is obtained.
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