OR
Telemetry, Tracking and Command (TT&C) Subsystem
These systems are partly on the satellite and partly at the control earth station. They
support the functions of the spacecraft management. The main functions of a TTC
system are
- To monitor the performance of all satellite subsystems and transmit the
monitored data to the satellite control center via a separate Telemetry link.
- To support the determination of orbital parameters.
- To provide a source to earth station for tracking.
- To receive commands from the control center for performing various functions
of the satellite.
- Typical functions include:
- To correct the position and attitude of the satellite.
- To control the antenna pointing and communication system configuration to
suit current traffic requirements.
- To operate switches on the spacecraft.
TELEMETRY:
- It collects data from all sensors on the satellite and send to the controlling
earth station.
- The sighting device is used to maintain space craft altitudes are also monitored
by telemetry.
- At a controlling earth station using computer telemetry data can be monitored
and decode.
- And status of any system on satellite can be determined and can be controlled
from earth station.
TRACKING:
- By using velocity and acceleration sensors, on spacecraft the orbital position
of satellite can be detect from earth station.
- For accurate and precise result number of earth stations can be used.