The Tracking and Data Relay Satellites comprise the space segment of NASA's communications relay system, providing telecommunication services to low earth orbiting spacecraft. In this area of the knowledge base, information is available on the following subjects:

The Tracking and Data Relay Satellite Description, which includes brief discussions of the spacecraft systems.

The TDRS Constellation,  graphically depicts the locations of the TDRS spacecrafts.

TDRS H, I, J which provides a brief comparison of the current TDRS baseline services in comparison to the next generation of Tracking and Data Relay Satellites 

TDRS Frequently Asked Questions

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