Measurements at 11 and 17 GHz of terrestrial microwave fading and depolarization
Abstract
A microwave propagation experiment conducted in the 11 GHz and 17 GHz frequency ranges on two adjacent 16 km paths is discussed. Direct and cross polarized signal levels were measured for six months, and significant attenuation and depolarization were observed during periods of rainfall as well as at certain times when the atmosphere was clear. Statistics of the durations and of the rates of change of attenuation are presented. The relation of depolarization during rainfall to the canting angles of raindrops is also discussed, and a procedure is developed by which the statistics of the canting angles are obtained. The magnitudes of attenuation during rainfall and attenuation in clear air, and of depolarization in both circumstances, are compared and assessed for their effects on microwave communication system design.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1982
- Bibcode:
- 1982STIN...8316592B
- Keywords:
-
- Depolarization;
- Frequency Ranges;
- Microwaves;
- Signal Fading;
- Wave Propagation;
- Atmospheric Attenuation;
- Cross Polarization;
- Rain;
- Communications and Radar