Accession Number:

ADA139154

Title:

An Atmospheric Millimeter Wave Propagation Model

Descriptive Note:

Final rept. 1 Aug 1979-31 Dec 1983

Corporate Author:

NATIONAL TELECOMMUNICATIONS AND INFORMATION ADMINISTRATION BOULDER CO INST FOR TELECOMMUNICATION SCIENCES

Personal Author(s):

Report Date:

1983-12-01

Pagination or Media Count:

118.0

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 O2 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 atmosphere provide basic millimeter wave propagation information over the height range 0 to 100 km of the neutral atmosphere.

Subject Categories:

  • Atmospheric Physics
  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE