Galileo worldwide ground segment

There is lot more to Galileo than just its satellites in space. A global ground network is essential to ensure the continued reliability of the time and positioning information embedded within the signals from orbit. Galileo’s worldwide ground segment has been described as the most complex system ever developed by ESA. It is divided into two segments: the Galileo Mission Segment, which oversees the functioning of the satellites’ navigation payloads including the generation of their signal messages, and the GCS that oversees the functioning of the satellites themselves.