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What does Galileo consist of?

What does Galileo consist of?

The Galileo system is comprised of three segments:

  1. Space Segment

A constellation of satellites transmitting navigation signals as specified in the different Galileo SIS ICDs, providing user access to the Galileo services. The baseline constellation configuration is defined as 24/3/1 Walker constellation: 24 nominal Medium Earth Orbit satellites are arranged in three orbital planes.

  1. Ground Segment

The Galileo Ground Segment includes both the Ground Control Segment (GCS) and the Ground Mission Segment (GMS) encompassing the following infrastructure:

  • Two Galileo Control Centres (GCC)
  • A worldwide network of Galileo Sensor Stations (GSS)
  • A worldwide network of Galileo Uplink Stations (ULS)
  • A worldwide network of Telemetry, Tracking & Control stations (TTC stations)

The core infrastructure is complemented by the Service Facilities supporting the Galileo services provision:

  • The European GNSS Service Centre (GSC)
  • The Geodetic Reference Service Provider (GRSP)
  • The Time Service Provider (TSP)
  • The Galileo Security Monitoring Centre (GSMC)
  • SAR/Galileo Data Service Provider (SGDSP)
  • Galileo Reference Centre (GRC)
  1. User Segment

Different GNSS receivers and devices that receive the Galileo signal-in-space (SiS).

 

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