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Communications
Space Flight Tracking and Data Network
Provides tracking, data acquisition and associated support.
Tracking and Data Relay Satellite System
Provides continuous global coverage of Earth-orbiting satellites at altitudes from 750 miles to about 3,100 miles.
Orbiter Communications
Transfers telemetry information, commands, documentation and voice communications.
Overview
Information is transferred through hardline and radio frequency links.
S-Band System
Operates in the S-band portion of the RF spectrum of 1,700 to 2,300 MHz.
Ku-Band System
Used only when the orbiter is on orbit.
Ku-Band Rendezvous Radar
Ku-Band system includes a rendezvous radar that skin-tracks satellites and other rendezvous targets.
Payload Communication System
Used to transfer information between orbiter and its payloads.
Ultrahigh Frequency System
Used as a backup fro S-Band PM and Ku-Band voice communications, primarily for EVAs.
Audio System
Interfaces with caution/warning system, UHF, S-Band, Ku-Band, and tacan systems.
Instrumentation
Several camera systems are used by the flight crew to document activities during the mission.
Overview
Used to collect, route and process information throughout the orbiter and its payloads.
Pulse Code Modulation Master Unit
Receives data from MDMs and formats them for transmission to the ground.
Network Signal Processor
Responsible for processing and routing commands, telemetry and voice between the orbiter and the ground.
Ground Command Interface Logic
Also referred to as the ground command interface logic controller.
General-Purpose Computer and Communication Interface
Computers process communication controls and provide a command path between the ground and orbiter subsystems.
Master Timing Unit
A stable crystal-controlled timing source for the orbiter.
Operational Recorders
Used for serial recording and dumping of digital voice and PCM data.
Payload Recorder
Records and dumps payload data through S-Band or Ku-Band transmitter.
Teleprinter
Interim system designed tro transmit written data from the ground to the crew.
Text and Graphics System
Fax scanner on the ground that sends text and graphics to hard copier in orbiter.
Close-Circuit Television System
Used to support on-orbit activities that require visual feedback to the crew.
Orbiter Experiments Support Systems for OV-102 (Columbia)
Records data obtained through OEX sensors.
Shuttle Infrared Leeside Temperature Sensing
Obtains high-resolution infrared imagery of orbiter surfaces during atmospheric entry.
Shuttle Entry Air Data System
takes measurements required for precise determination of air data during launch and landing phases.
Shuttle Upper Atmosphere Mass Spectrometer
Obtains measurements of free-stream density during atmospheric entry.
Aerodynamic Coefficient Identification Package
A group of senssors palced on the orbiter to obtain experiment measurements unavailable through the baseline system.
High-Resolution Accelerometer Package
Measures low-level aerodynamic accelerations along the orbiter's principal axed during re-entry.
Modular Auxiliary Data System
Measures and records selected pressure, temperature, strain, vibration and event data.

Curator: Kim Dismukes | Responsible NASA Official: John Ira Petty | Updated: 04/07/2002
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