Statistics of differential rain attenuation on adjacent earthspace propagation paths
Abstract
The centimeter wavelength attenuations occurring simultaneously over a multitude of earthspace propagation paths were simulated by forty hours of observations of the threedimensional radar reflectivity structure of rain in the Montreal area. The differences between the attenuations occurring simultaneously over pairs of paths to a common point at the ground were compiled as a function of angular path separation, viewing direction, radio frequency, and system margin. Values of angular separation from 2 to 9 degrees, radio frequencies from 11 to 30 GHz, elevation angles from 5 to 30 degrees, and system margins from 2 to 10 dB were considered. Results show that the cumulative distributions of differential attenuation is effectively characterized by the attenuation difference occurring during 1 percent of the time that the carrier signal suffered some attenuation, but not an attenuation exceeding the system margin. In addition, it was found that a simple analytical function of the system parameters can be used to express this characteristic differential attenuation.
 Publication:

Annales des Telecommunications
 Pub Date:
 December 1982
 Bibcode:
 1982AnTel..37..445R
 Keywords:

 Atmospheric Attenuation;
 Centimeter Waves;
 Electromagnetic Interference;
 Microwave Attenuation;
 Multipath Transmission;
 Rain;
 Satellite Transmission;
 Attenuation Coefficients;
 Downlinking;
 Probability Theory;
 Radar Echoes;
 Statistical Distributions;
 Systems Simulation;
 Communications and Radar