TT & C SYSTEM FOR AT&T TELSTAR 3

Abstract

The first of three TELSTAR 3 satellites will be launched in mid 1983. Prior to this time, a Telemetry Tracking and Control system will have been installed to track and command the satellites during transfer orbit and will continue these tasks when each satellite is in it’s working orbit. This system consists of the Satellite Control Center (SCC) and the Primary Satellite Control Earth Station (PSCES), co-located at Hawley, Pennsylvania. In the event of unforeseen circumstances, the alternate satellite control center and earth station at Three Peaks, California, would be capable of performing the on-station Telemetry, Tracking, and Command operations for all three TELSTAR 3 satellites. Each location has redundant computer systems which are capable of all telemetry and command processing for three spacecraft. Only the Hawley site has the capability for tracking during transfer orbit by using the 13 meter full-motion antenna. This 13 meter antenna also houses the computercontrolled test equipment that will perform initial in-orbit testing of all three satellites, as well as normal testing throughout the life of the satellites. During transfer orbit, remote tracking station services will be provided by stations which are not part of the AT&T system. Data collected by the remote stations will then be sent to the SCC at Hawley for use in determining attitude and orbit. The second and third launches are scheduled for Mid 1984 and 1985, respectively.