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An Overview of the Space Shuttle Orbiter Communication and Tracking System

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2 Author(s)
Carrier, L. ; Rockwell International, Downey, CA ; Pope, W.

During space flight, the communications and tracking system of the Space Shuttle Orbiter usesS-band andKu-band links to provide, in addition to tracking, reception of digitized voice, commands, and printed or diagrammatic data at a maximum rate of 216 kbits/s. The system provides a transmission capability for digitized voice, telemetry, television, and data at a maximum rate of 50 Mbits/s.S-band links may be established directly with a ground station and bothS-band andKu-band links may be routed through NASA's Tracking and Data Relay Satellite System. A simultaneous capability to communicate with other satellites or spacecraft, using a variety of formats and modulation techniques on more than 850S-band channels, is provided. UHF is used for communication with extravehicular astronauts. Audio and television subsystems serve on-board needs as well as interfacing with the RF equipment. During aerodynamic flight following entry, theS-band link can be supplemented or replaced by a UHF link that provides two-way simplex voice communication with Air Traffic Control facilities. TACAN is used as a navigation aid from shortly after blackout exit at about 150 000 ft (45.7 km) to about a 10 000-ft (3-km) altitude where a microwave scan-beam landing system assumes navigation aid functions. At about 2500 ft (760 m) to touchdown, radar altimeters provide accurate altitude determination.

Published in:

Communications, IEEE Transactions on  (Volume:26 ,  Issue: 11 )

Date of Publication:

November 1978

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