3.3 Antenna Tracking And Auto Frequency Control Systems At Earth Stations For Non-Geostationary Comets Satellite Experiments

摘要

The communications and broadcasting engineering test satellite (COMETS) was launched in Feb. 1998 and turned out to have a subreccurent orbit. Therefore to carry out the satellite communication experiments using COMETS, the earth stations specified to COMETS of the geostationary orbit must be modified to accommodate the non-geostationary orbit. We developed an antenna tracking system and a non-geostationary satellite auto frequency control (AFC) system, and carried out various experi- ments using COMETS. This report outlines the measures of the earth stations.