Transcription of Satellite Telemetry, Tracking and Control Subsystems
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Satellite Telemetry, Tracking and Control Subsystems
Satellite Telemetry, Tracking and Control Subsystems Col John E. Keesee October 29, 2003 Massachusetts Institute of 1. Technology Overview The telemetry, Tracking and Control subsystem provides vital communication to and from the spacecraft TT&C is the only way to observe and to Control the spacecraft's functions and condition from the ground October 29, 2003 Massachusetts Institute of 2. Technology Outline TT&C functions and trades Command System functions Encoding/Decoding Messages Interfaces Telemetry systems Sensors and transducers ADC. Formats Concerns/Design principles October 29, 2003 Massachusetts Institute of 3. Technology TT&C Functions Carrier Tracking Command reception and detection Telemetry modulation and transmission Ranging Subsystem operations October 29, 2003 Massachusetts Institute of 4. Technology Carrier Tracking Two-way coherent communication Transmitter phase-locks to the received frequency Transmitted frequency is a specific ratio of the uplink frequency Easy to find and measure the frequency received on the ground Doppler shift provides range rate October 29, 2003 Massachusetts Institute of 5.
Oct 29, 2003 · • Phase shift keying (PSK) • Frequency shift keying (FSK) Ground Support Equipment Spacecraft Command System Radio Frequency link Modulation. Command Decoders • Detects PCM encoding and outputs binary stream in non-return-to-zero format • Outputs clock signal • Outputs lock/enable signal
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