Forward scatter from rain

Author

Doherty, L.H. ; Stone, S.A.

Author_Institution

Radio and Electrical Engineering Division, National Research Council, Ottawa, Canada

Volume

8

Issue

4

fYear

1960

fDate

7/1/1960 12:00:00 AM

Firstpage

414

Lastpage

418

Abstract

The forward scatter of radio waves from rain has been observed over a 90-mile, 2720-mc path. The observations support the assumption of omnidirectional scattering from rain. On this link rain scatter may exceed the normal tropospheric scatter signal by 15 db. This latter signal may itself be increased by the presence of thunderstorms in the vicinity. Signal level distribution during rain and no-rain conditions are presented. Among the effects of rain on a tropospheric scatter link are the increased fading rate and decreased bandwidth. The fading rate may increase by a factor of ten or more, and pulse-to-pulse fluctuations have been observed at a pulse repetition frequency of 600 pulses per second. Evidence for a decreased bandwidth is presented in the form of pulse photographs. The $1.5-\\mu$ sec pulse is commonly broadened to 3 or $4 \\mu$ sec and on occasions to lengths in excess of $20 \\mu$ sec.

Keywords

UHF radio propagation meteorological factors; Bandwidth; Councils; Frequency; Green´s function methods; Marine vehicles; Meteorological radar; Radar scattering; Rain fading; Terrestrial atmosphere; Wave functions;

fLanguage

English

Journal_Title

Antennas and Propagation, IRE Transactions on

Publisher

ieee

ISSN

0096-1973

Type

jour

DOI

10.1109/TAP.1960.1144879

Filename

1144879