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Galileo Performances

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GALILEOGALILEO
Title Galileo Performances
Author(s) GMV
Level Basic
Year of Publication 2011
Logo GMV.png


Galileo system is a space-based global navigation satellite system (GNSS) that provides reliable positioning, navigation, and timing services to users on a continuous worldwide basis freely available to all.

Galileo Service Level

Galileo is a civil system, operated under public control. Its missions include:

  • Implementing an independent Global Navigation Satellite System (GNSS) that will fit in with and operate alongside existing and planned navigation and communication systems to provide both enhancements and redundancy;
  • Improving the European infrastructure, particularly for multi-modal transport, while providing a global high-quality civil Position-Velocity-Time (PVT) capability;
  • Supporting the special needs of safety of life and other applications and anticipating the needs of value-added suppliers in creating new markets and applications.

To a large extent, these mission requirements have been formally expressed in terms of the services that Galileo will make available or will support. These service levels are:

  • Open Service (OS) - providing positioning, navigation and timing services, free of charge, for mass market navigation applications and competitive to the GPS Standard Positioning Service and its evolutions;
  • Safety of Life (SoL) – compliant to different standards in the aeronautical, maritime and rail domains. The SoL includes Integrity and Authentication capabilities. The SoL include service guarantees;
  • Commercial Service (CS) - generates commercial revenue by providing added value over the Open Service, such as by dissemination of encrypted navigation related data (0.5 kbps), ranging and timing for professional use - with service guarantees;
  • Public Regulated Service (PRS) - for applications devoted to European/National security, regulated or critical applications and activities of strategic importance. The PRS will provide robust and encrypted signals, under Member States control.
  • Search and Rescue Support Service (SAR) - provides assistance to the COSPAS-SARSAT system (space system for search of vessels in distress/search and rescue satellite-aided tracking) by detecting Emergency Beacons and forwarding Return Link Messages to the Emergency Beacons.

All the above services are named “Galileo-Satellite-only services”, as they will be provided by means of the so-called Galileo Global system component. It will be possible to enhance the performances of the Galileo satellite-only services, with the addition of local or regional component.

Galileo Service Level Perfomances

From Galileo Mission High Level Definition [1]

Parameter Galileo Service Level
OS/CS SoL PRS
SU DU (E5a/L1) Aeronautical & Vehicle User (E5b/L1) SU DU (L1/E6)
E5a E5b L1 L1 E6
Lateral accuracy (95%, m) 24 24 15 4 4 15 24 6.5
Vertical accuracy (95%, m) 35 35 35 8 8 35 35 12
Velocity accuracy (95%, m/s) 0.2 0.2 0.2 0.2 0.2
Timing Accuracy (ns) N/A 30 N/A N/A
HAL (m) N/A 12 N/A 20
VAL (m) N/A 20 N/A 35
TTA (s) N/A 5.2 N/A 10
Integrity Risk N/A 2.10-7 / 150s N/A 2.10-7 / 150s
Continuity N/A 1-8.10-6 / 15s N/A 1-8.10-6 / 15s
Availability (%) 99.5 99.5 99.5 99.5 99.5 99.5

References