Space Network


Space Network is a NASA program that combines space and ground elements to support spacecraft communications in Earth vicinity. The SN Project Office at Goddard Space Flight Center manages the SN, which consists of:
currently consists of first generation, and second generation satellites.
The space segment of the SN consists of up to six operational relay satellites in geosynchronous orbit. These communications satellites are allocated longitudes for relaying forward and return service signals to and from customers, any entity with an Earth-orbiting satellite that has an agreement with SN to use its communications services, for data transfer and tracking. An additional TDRS, F1, provides dedicated support to the National Science Foundation through the use of the WSC Alternate Relay Terminal. Additional spare TDRSs may be in geosynchronous orbit.
All first generation TDRSs carry functionally identical payloads and all second generation TDRSs carry functionally identical payloads.
A third generation, TDRS K and L, are planned for launch 2012–2013. See TDRS launch history.
Click on the figures to the right, which identify the pertinent communications components and associated parameters of the orbiting relay platforms.

Coverage

For spacecraft operating in a low earth orbit 73 km to 3000 km altitude, the SN is capable of providing tracking and data acquisition services over 100% of the spacecraft's orbit. Spacecraft sent to more distant or exotic destinations rely on either Deep Space Network or their own custom, dedicated networks.