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| AGARD Conference Proceedings 454: Atmospheric Propagation in the UV, Visible, IR and MM-Wave Region and Related Systems Aspects Modeling Millimeter-wave Propagation Effects in the Atmosphere Hans J. Liebe and George A. Hufford 1989 |
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| Abstract:
Two millimeter-wave propagation models, called MPM and MZM, are discussed. The first one predicts, at frequencies up to 1000 GHz, loss and delay effects for a nonprecipitating atmosphere. Contributions from dry air and water vapor are addressed, as well as suspended water droplets that simulate fog or cloud conditions. For clear air, a local spectral line base is employed (44 O2 + H2O lines) complemented by an empirical water-vapor continuum. Droplet effects are treated with the approximate Rayleigh scattering theory. Input variables are barometric pressure, temperature, relative humidity, and droplet concentration.
At heights between 30 and 100 km, the spectral lines of oxygen result in an anisotropic medium due to the geomagnetic Zeeman effect. The computer program MZM was developed to analyze propagation of plane, polarized radio waves in the vicinity (±10 MHz) of O2 line centers positioned in the 60-GHz band and at 119 GHz. Results are displayed that demonstrate many aspects of the unusual wave propagation through the mesosphere. |
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| This paper is not subject to U.S. copyright. Published in 1985 by the American Geophysical Union. |
| Disclaimer: Certain commercial equipment, components, and software are identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses. |
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