Space Network (SN)

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The Space Network (SN) empowers missions with reliable and secure relay communications and tracking services. The SN's global coverage enables near-continuous, bi-directional communications, a unique capability well-suited for launch vehicles and flagship missions like the International Space Station and the Hubble Space Telescope.

The SN's architecture is comprised of two segments. The space segment consists of a constellation of Tracking and Data Relay Satellites (TDRS) in geosynchronous orbit. A series of ground-based antennas make up the network's ground segment. All TDRS are within sight of at least one ground station at all times.