SATTELLITE COMMUNICATION notes

Satellite Communication – Telemetry,
Tracking & Command (TT&C) System
Telemetry Tracking and Command (TTC) in Satellite Communication

Hello everyone, welcome to the series on satellite communication. In this
topic, we will be discussing telemetry tracking and command (TTC), which is
one of the major subsystems of a satellite.



Objective and Function of TTC

The telemetry tracking and command subsystem is responsible for the
management tasks of the satellite communication. It serves as a dynamic
link between the satellite and the ground station. Some of the major
functions performed by TTC include:

 Transmission of housekeeping information and satellite status to the
ground control station
 Receiving command signals for station keeping operations
 Measuring angle and range for localization

Telemetry, Tracking, and Command Units

The TTC system consists of three units: telemetry subsystem, tracking
subsystem, and command subsystem. Let’s take a closer look at each unit:



 Telemetry System

The telemetry system monitors the satellite parameters and transmits the
measured values to the control stations. It collects data from various sensors
on the satellite, such as voltage, current, temperature, switch status, and
pressure. This data is then processed and sent to the control center.



 Tracking System

The tracking system continuously monitors the movement of the satellite. It
provides information about the range, elevation, and azimuth angle of the
satellite. Tracking is especially important during the transfer of the satellite
from the temporary orbit to the final orbit.