The Programme

Galileo is Europe’s own global navigation satellite system, providing a highly accurate, guaranteed global positioning service under civilian control. It is inter-operable with GPS and GLONASS, the two other global satellite navigation systems.

By offering dual frequencies as standard, Galileo will deliver real-time positioning accuracy down to the metre range. It will guarantee availability of the service under all but the most extreme circumstances and will inform users within seconds of any satellite failure, making it suitable for safety-critical applications such as guiding cars, running trains and landing aircraft.

The first two experimental navigation satellites, GIOVE-A and –B, were launched in 2005 and 2008 respectively, reserving radio frequencies set aside for Galileo by the International Telecommunications Union and testing key Galileo technologies.

Then on 21 October 2011 came the first two of four operational satellites designed to validate the Galileo concept in both space and on Earth. Two more will follow in 2012. Once this In-Orbit Validation (IOV) phase has been completed, additional satellites will be launched to reach Initial Operational Capability (IOC) around mid-decade.

At this stage, the Open Service, Search and Rescue and Public Regulated Service will be available with initial performances. Then along the build-up of the constellation, new services will be tested and made available to reach the Full Operational Capability (FOC).

Galileo services will come with quality and integrity guarantees which mark the key difference of this first complete civil positioning system from the military systems that have come before.

Galileo Architecture

The fully deployed Galileo system consists of 30 satellites (27 operational + 3 active spares), positioned in three circular Medium Earth Orbit (MEO) planes at 23 222 km altitude above the Earth, and at an inclination of the orbital planes of 56 degrees to the equator 

The Galileo ground infrastructure will be composed of:

  • 30-40 sensor stations;
  • 3 control centres;
  • 9 Mission Uplink stations;
  • 5  telemetry, tracking and command (TT&C) stations
Galileo system architecture

 

GNSS.asia project is funded by the European Union within the Seventh Framework Programme under grant agreement no 287244.