Accession Number : ADP006125

Title :   Line-of-Sight Millimeter Wave Propagation Characteristics,

Corporate Author : NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION BOULDER CO WAVE PROPAGATION L AB

Personal Author(s) : Clifford, S. F. ; Hill, R. J. ; Fritz, R. B.

Report Date : MAY 1987

Pagination or Media Count : 7

Abstract : From 1983 to 1985 a team of scientists from NOAA's Wave Propagation Laboratory and Georgia Institute of Technology conducted an extensive set of millimeter wave propagation measurements. In five, thirty-day sessions, chosen for the widest variety of weather conditions, we propagated millimeter wave frequencies from 116 to 230 GHz over a 1.4 km horizontal path in Flatville, Illinois. Simultaneous, extensive measurements of the meteorological allowed a detailed comparison of the propagation characteristics during clear air and severe weather. Amplitude and phase spectra for propagation in clear air are compared with theory derived using the weak refractive turbulence approximation. Excellent agreement is found. Further, probability density functions appear to be; respectively, lognormal (amplitude) and Gaussian (phase difference), as expected from application of the central limit theorem. Interesting meteorological observations and their millimeter wave signatures will also be presented. (Author)

Descriptors :   *ELECTROMAGNETIC WAVE PROPAGATION, RADIO TRANSMISSION, MILLIMETER WAVES, EXTREMELY HIGH FREQUENCY, LINE OF SIGHT, FIELD TESTS, ALL WEATHER, REFRACTION, TURBULENCE, SYMPOSIA.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE