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Galileo (satellite navigation)

Galileo (satellite navigation)

Galileo is Europe’s own global navigation satellite system

Galileo is Europe’s own global navigation satellite system, providing a highly accurate, guaranteed global positioning service under civilian control. Currently providing Initial Services, Galileo is interoperable with GPS and Glonass, the US and Russian global satellite navigation systems. By offering dual frequencies as standard, Galileo is set to deliver real-time positioning accuracy down to the metre range.

Segments of Galileo

Space segment: The Galileo Space Segment consists of a constellation of satellites transmitting navigation signals 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 3 orbital planes.

Ground segment: The Galileo Ground Segment includes both the Ground Control Segment (GCS) and the Ground Mission Segment (GMS) and it encompasses the following infrastructures:

  • 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).

User segment: Different GNSS receivers and devices, which receive the Galileo Signal In Space (SiS).


  • Galileo allows users to know their exact position with greater precision than what is offered by other available systems.
  • The products that people use every day, from the navigation device in your car to a mobile phone, benefit from the increased accuracy that Galileo provides.
  • Critical, emergency response-services benefit from Galileo.
  • Galileo’s services will make Europe’s roads and railways safer and more efficient.
  • It boosts European innovation, contributing to the creation of many new products and services, creating jobs and allowing Europe to own a greater share of the EUR 175 billion global GNSS market.


Further Resources


Driving with Galileo


February 15, 2019

European GNSS Service Centre


European Space Agency


Galileo Search and Rescue (SAR)


April 5, 2017

What is Galileo?


December 11, 2017

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