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.

The Galileo performances are different for each service. For the Galileo Open Service (OS) no specific requirements of integrity are applicable. The performances for horizontal positioning accuracy at 95% for a dual-frequency receiver are 4 m (8 m for vertical accuracy), with an availability of the service of 99%.

In the case of the Galileo Safety of Life (SoL) and the Galileo Public Regulated Service (PRS), the performance requirements include horizontal and vertical accuracy, integrity, continuity and time to alert for different service levels. The availability of the service should be 99.5% for both services.

Galileo Service Level Perfomances

From Galileo Mission High Level Definition, the performances requirements for each service:

Parameter	Galileo Service Level
	OS				SoL	PRS
	Single-Frequency User (SF)			Dual-Frequency User (DF;E5a/L1)	DF (E5b/L1)	SF		DF (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
Timing Accuracy wrt UTC/TAI (ns)	N/A			30	N/A	N/A		100
Horizontal Alarm Limit (m)	N/A				12	N/A		20
Vertical Alarm Limit (m)	N/A				20	N/A		35
Time-To-Alarm (s)	N/A				5.2	N/A		10
Integrity Risk	N/A				2.10-7 / 150s	N/A		2.10-7 / 150s
Continuity Risk	N/A				1-8.10-6 / 15s	N/A		1-8.10-6 / 15s
Availability of Accuracy (%)	99.8				99.8	99.8
Availability of Integrity (%)	N/A				99.5	N/A		99.5
Coverage	Global				Global	Global

The Commercial Service will be a controlled access service operated by Commercial Service Providers, who will make decisions on the offered services: e.g. integrity data, differential corrections for local areas, etc… which will depend on the final characteristics of the other services offered by Galileo.