Tracking and Data Relay
The TDRS acronym describes the Tracking and Data Relay Satellite, the on orbit spacecraft. TDRSS, or Tracking and Data Relay Satellite System, includes the space segment, ground station and communication links between all.
The backbone to all U.S. space communications, the jewel that is TDRSS has kept NASA at the scientific forefront by controlling many high priority space missions simultaneously, routing critical data back to the mission owners.
~Joseph T. Page II
New Mexico Space Trail
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Official Website: TDRSS information available at NASA