Galileo Performances

GALILEO
Title	Galileo Performances
Author(s)	GMV
Level	Basic
Year of Publication	2011

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

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