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Collection InformationProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
AbstractThe Tracking and Data Relay Satellite System (TDRSS) provides data relay and tracking services for other (user) satellites. The ground station performs all the modulation/demodulation functions for, simultaneously, as many as 19 forward (to user spacecraft) and 32 return (from user spacecraft) data channels at K and at S-band. TDRSS is transparent to the data itself; it passes synchronized bit streams directly to/from NASA. The data channels exist on up to 4 communication satellites and are carried on 6 single access and 3 multiple access space antennas. TDRSS relay services are available 24 hours/day, 7 days/week. Individual services using a single TDRS may be maintained for up to 24 hours. Using 3 TDRS', a user satellite may be serviced continually. The TDRSS ground station is a highly automated collection of communication electronics. Automation is achieved through the use of software in a large complex of dedicated computers - 9 DEC PDP 11/70's and a dual processor Univac 1110. The software performs three major functions: * management of the TDRSS resources - spacecraft, ground antennas, demodulators, bit syncs, etc. * computation of user spacecraft tracking/trajectory data * telemetry, tracking and control of the TDRS' The software/ADPE configuration was designed to provide the responsiveness needed to support the TDRSS mission: rapid and flexible scheduling and management of equipment to provide relay to and from NASA; rapid, highly accurate trajectory and tracking computation; ground-supported autotrack for the TDRS single access antennas; simultaneous provision of TT&C functions for multiple TDRS'; and control of the behavior of the Ground Station under abnormal (failed equipment) conditions.
SponsorsInternational Foundation for Telemetering