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Managed development of Tracking Data Relay Satellite System and Rockwell Global Positioning System.
This includes NASA's ground network, including suborbital operations, and the Tracking Data Relay Satellite System, a constellation of nine satellites that is the primary architecture of the communications system for the Space Shuttle, International Space Station programs and Hubble Space Telescope," Mikita said.
Using the signals transmitted from a spacelift vehicle, a reliable and safe two-way communications link is established through a tracking satellite, such as NASA's Tracking Data Relay Satellite System, enabling ground operators to monitor the vehicle throughout the space launch, and terminate the vehicle if it strays off course.