Performance of orbital diversity systems and comparisons with site diversity in earth-space radiolinks affected by rain attenuation
Abstract
The results of a meteorological-radar simulation of an orbital-diversity (OD) satellite-downlink system operating at 11.6 GHz are reported and compared with the site-diversity (SD) results of Capsoni et al. (1983). The beacon of the SIRIO satellite was observed with an S-band meteorological radar at 32-deg inclines (to simulate OD), obtaining 49-sec reflectivity maps during 40 h containing 24 separate rain events in May-October, 1981 and 1982. The results are presented graphically and compared with the SD data, using the gain parameter of Hodge (1974). The rain attenuation is found to vary from 15 percent of the SD value at aperture angle 16 deg to 55 percent at 95.5 deg. The superior performance of OD is shown to be applicable (using frequency-scaling ratios) to high-capacity radio links at higher frequencies (e.g., 20 GHz).
- Publication:
-
10th Communication Satellite Systems Conference
- Pub Date:
- 1984
- Bibcode:
- 1984coss.conf..565C
- Keywords:
-
- Meteorological Radar;
- Microwave Attenuation;
- Radio Relay Systems;
- Raindrops;
- Reception Diversity;
- Satellite Transmission;
- Atmospheric Attenuation;
- Data Simulation;
- Downlinking;
- Radar Attenuation;
- Radar Beacons;
- Radio Attenuation;
- Sirio Satellite;
- Transmission Efficiency;
- Uplinking;
- Communications and Radar