Galileo remote sites

Galileo’s worldwide ground segment is one of the most complex developments ever undertaken by ESA, extending from twin European Galileo Control Centres and uplink stations on remote sites across the world. They are all interconnected via a robust satcoms network. It includes Galileo Sensor Stations (GSSs) to provide coverage for clock synchronisation and orbit measurements; Uplink Stations (ULSs) to uplink navigation and integrity data to the Galileo satellite navigation payloads for rebroadcast to users; Telemetry, Tracking and Command Stations (TT&Cs) to manage the satellite platforms; an In-Orbit Test (IOT) site at Redu for satellite payload testing and a trio of Medium-Earth Orbit Local User Terminals (MEOLUTs) for search and rescue activities.