Galileo Open Service (OS) - Revision history

Gema.Cueto at 11:04, 30 June 2025

2025-06-30T11:04:27Z

← Older revision		Revision as of 11:04, 30 June 2025
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	95% values)\|thumb]]		95% values)\|thumb]]

	With regard to the evolution of the availability performance, the next table summarize the expected figures for ~~18, 22 and~~ 24 satellites.		With regard to the evolution of the availability performance, the next table summarize the expected figures for 24 satellites.

	[[File:Galileo_OS_Performance_PDOP_v1.png \|450 px\|center\|Evolution of the Expected Availability of Global		[[File:Galileo_OS_Performance_PDOP_v1.png \|450 px\|center\|Evolution of the Expected Availability of Global

Gema.Cueto at 11:03, 30 June 2025

2025-06-30T11:03:09Z

← Older revision		Revision as of 11:03, 30 June 2025
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	The freely accessible Galileo Open Service (OS) targets the mass market and it is intended for motor vehicle navigation and location-based mobile telephone services. Free to the user, it provides positioning and synchronization information intended for high-volume satellite radio navigation applications.		The freely accessible Galileo Open Service (OS) targets the mass market and it is intended for motor vehicle navigation and location-based mobile telephone services. Free to the user, it provides positioning and synchronization information intended for high-volume satellite radio navigation applications.

	The Galileo Open Service is available since December 2016, when the Galileo Initial Services were declared.<ref name ="goes live"> [https://www.gsa.europa.eu/newsroom/news/galileo-goes-live Galileo goes live!] </ref> The services will evolve with the infrastructure deployment ~~until~~ the Full Operational Capability (FOC) is achieved.		The Galileo Open Service is available since December 2016, when the Galileo Initial Services were declared.<ref name ="goes live"> [https://www.gsa.europa.eu/newsroom/news/galileo-goes-live Galileo goes live!] </ref> The services will evolve with the infrastructure deployment even after the Full Operational Capability (FOC) is achieved, the evolution plan can be seen in [[Galileo Future and Evolutions]].

	Galileo will include in the short term an authentication mechanism through [[Galileo Open Service Navigation Message Authentication \| Galileo OS-NMA]].		Galileo will include in the short term an authentication mechanism through [[Galileo Open Service Navigation Message Authentication \| Galileo OS-NMA]].
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	The timing service is synchronised with UTC when used with receivers in fixed locations. This timing service can be used for applications such as network synchronisation or scientific applications.		The timing service is synchronised with UTC when used with receivers in fixed locations. This timing service can be used for applications such as network synchronisation or scientific applications.

	The Open Service does not offer integrity information, and the determination of the quality of the signals is left entirely to the users. There is no service guarantee or liability from the Galileo Operating Company on the Open Service.<ref name="ESA_GALILEO">[http://www.esa.int/esaNA/galileo.html ESA Galileo web page]</ref> However, the Open Service will include in the short term an authentication mechanism to called [[Galileo Open Service Navigation Message Authentication \| Galileo OS-NMA]] (Navigation ~~Mechanism~~). Galileo is the first constellation which will include an NMA mechanism in an Open Service signal.		The Open Service does not offer integrity information, and the determination of the quality of the signals is left entirely to the users. There is no service guarantee or liability from the Galileo Operating Company on the Open Service.<ref name="ESA_GALILEO">[http://www.esa.int/esaNA/galileo.html ESA Galileo web page]</ref> However, the Open Service will include in the short term an authentication mechanism to called [[Galileo Open Service Navigation Message Authentication \| Galileo OS-NMA]] (Navigation Message Authentication). Galileo is the first constellation which will include an NMA mechanism in an Open Service signal.

	The following services are supported by Galileo OS SIS:		The following services are supported by Galileo OS SIS:
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	==Performance and features==		==Performance and features==
	The [[GALILEO Signal Plan\|Galileo Open Service]] is accessible through the signals at L1, E5a and E5b, whether data or pilot. Several combinations are also possible, such as a dual frequency service based on using L1 and E5a (for best ionospheric error cancellation) or single frequency services (at L1, E5a, E5b or E5a and E5b together) in which case the ionospheric error is removed using a model, and even triple frequency services using all the signals together (L1, E5a and E5b), which can be exploited for very precise, centimetre level applications.<ref name="ESA_GALILEO"/> <ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.1.pdf Galileo Open Service SDD]</ref>		The [[GALILEO Signal Plan\|Galileo Open Service]] is accessible through the signals at E1, E5a and E5b, whether data or pilot. Several combinations are also possible, such as a dual frequency service based on using E1 and E5a (for best ionospheric error cancellation) or single frequency services (at E1, E5a, E5b or E5a and E5b together) in which case the ionospheric error is removed using a model, and even triple frequency services using all the signals together (E1, E5a and E5b), which can be exploited for very precise, centimetre level applications.<ref name="ESA_GALILEO"/> <ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.3.pdf Galileo Open Service SDD]</ref>

	The performance objectives in terms of position accuracy and availability are competitive with respect to existing GNSS and further planned evolutions. In addition, the Open Service is interoperable with other GNSS, in order to facilitate the provision of combined services. The following table presents the expected Galileo Open Service performance once the Full Operational Capability is achieved. <ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.1.pdf Galileo Open Service SDD]</ref>		The performance objectives in terms of position accuracy and availability are competitive with respect to existing GNSS and further planned evolutions. In addition, the Open Service is interoperable with other GNSS, in order to facilitate the provision of combined services. The following table presents the expected Galileo Open Service performance once the Full Operational Capability is achieved. <ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.3.pdf Galileo Open Service SDD]</ref>

	{\| class="wikitable" align="center"		{\| class="wikitable" align="center"
	\|+align="bottom" \|''Service Performances for Galileo Open Service (~~requirements~~)''		\|+align="bottom" \|''Service Performances for Galileo Open Service (MPLs)''
	\|-		\|-
	! rowspan="2" \|		! rowspan="2" \|
	! colspan="2"\| Galileo Open Service (~~positioning & timing (requirements)~~)		! colspan="2"\| Galileo Open Service Minimum Performance Levels (MPLs)
	\|- align="center"		\|- align="center"
	! Single Frequency (SF)		! Single Frequency (SF)
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	\|- align="center"		\|- align="center"
	! rowspan="2" \| Accuracy (95%)		! rowspan="2" \| Accuracy (95%)
	\| Horizontal: 15 m		\| Horizontal: < 5 m
	\| Horizontal: 4m		\| Horizontal: < 5 m
	\|- align="center"		\|- align="center"
	\| Vertical: 35 m		\| Vertical: < 8 m
	\| Vertical: 8m		\| Vertical: < 8 m
	\|- align="center"		\|- align="center"
	! Availability		! Availability
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	For the Minimum Performance Values expected until this Full Operational Capability is declared, please refer to details in [[Galileo Performances \| Galileo Performances]] article.		For the Minimum Performance Values expected until this Full Operational Capability is declared, please refer to details in [[Galileo Performances \| Galileo Performances]] article.

	Next table presents the expected evolution of the horizontal and vertical position accuracy for the Galileo OS Positioning versus the number of operational healthy satellites.<ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.1.pdf Galileo Open Service SDD]</ref> The values provided are global values, taking into account the constraint of PDOP ≤6. Values corresponding to average user location (AUL) and worst user location (WUL) are presented.		Next table presents the expected evolution of the horizontal and vertical position accuracy for the Galileo OS Positioning versus the number of operational healthy satellites.<ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.3.pdf Galileo Open Service SDD]</ref> The values provided are global values, taking into account the constraint of PDOP ≤ 6. Values corresponding to average user location (AUL) and worst user location (WUL) are presented.

	[[File:~~Galileo_OS_Performance~~.~~jpg~~ \|450 px\|center\|Evolution of the Expected Galileo OS Positioning		[[File:Galileo_OS_Performance_v1.png \|450 px\|center\|Evolution of the Expected Galileo OS Positioning
	Performance in nominal configuration (in metres,		Performance in nominal configuration (in metres,
	95% values)\|thumb]]		95% values)\|thumb]]
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	With regard to the evolution of the availability performance, the next table summarize the expected figures for 18, 22 and 24 satellites.		With regard to the evolution of the availability performance, the next table summarize the expected figures for 18, 22 and 24 satellites.

	[[File:~~Galileo_OS_Availability~~.~~jpg~~\|450 px\|center\|Evolution of the Expected Availability of Global		[[File:Galileo_OS_Performance_PDOP_v1.png \|450 px\|center\|Evolution of the Expected Availability of Global
	PDOP\|thumb]]		PDOP\|thumb]]

Gema.Cueto at 11:00, 29 January 2021

2021-01-29T11:00:11Z

← Older revision		Revision as of 11:00, 29 January 2021
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	The timing service is synchronised with UTC when used with receivers in fixed locations. This timing service can be used for applications such as network synchronisation or scientific applications.		The timing service is synchronised with UTC when used with receivers in fixed locations. This timing service can be used for applications such as network synchronisation or scientific applications.

	The Open Service does not offer integrity information, and the determination of the quality of the signals is left entirely to the users. There is no service guarantee or liability from the Galileo Operating Company on the Open Service.<ref name="ESA_GALILEO">[http://www.esa.int/esaNA/galileo.html ESA Galileo web page]</ref> However, the Open Service will include in the short term an authentication mechanism to called Galileo OS-NMA (Navigation Mechanism). Galileo is the first constellation which will include an NMA mechanism in an Open Service signal.		The Open Service does not offer integrity information, and the determination of the quality of the signals is left entirely to the users. There is no service guarantee or liability from the Galileo Operating Company on the Open Service.<ref name="ESA_GALILEO">[http://www.esa.int/esaNA/galileo.html ESA Galileo web page]</ref> However, the Open Service will include in the short term an authentication mechanism to called [[Galileo Open Service Navigation Message Authentication \| Galileo OS-NMA]] (Navigation Mechanism). Galileo is the first constellation which will include an NMA mechanism in an Open Service signal.

	The following services are supported by Galileo OS SIS:		The following services are supported by Galileo OS SIS:

Gema.Cueto at 10:59, 29 January 2021

2021-01-29T10:59:18Z

← Older revision		Revision as of 10:59, 29 January 2021
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	The Galileo Open Service is available since December 2016, when the Galileo Initial Services were declared.<ref name ="goes live"> [https://www.gsa.europa.eu/newsroom/news/galileo-goes-live Galileo goes live!] </ref> The services will evolve with the infrastructure deployment until the Full Operational Capability (FOC) is achieved.		The Galileo Open Service is available since December 2016, when the Galileo Initial Services were declared.<ref name ="goes live"> [https://www.gsa.europa.eu/newsroom/news/galileo-goes-live Galileo goes live!] </ref> The services will evolve with the infrastructure deployment until the Full Operational Capability (FOC) is achieved.

	Galileo will include in the short term an authentication mechanism through Galileo OS-NMA.		Galileo will include in the short term an authentication mechanism through [[Galileo Open Service Navigation Message Authentication \| Galileo OS-NMA]].

	==Purpose==		==Purpose==

Gema.Cueto: /* Purpose */

2020-12-14T09:43:08Z

Purpose

← Older revision		Revision as of 09:43, 14 December 2020
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	The timing service is synchronised with UTC when used with receivers in fixed locations. This timing service can be used for applications such as network synchronisation or scientific applications.		The timing service is synchronised with UTC when used with receivers in fixed locations. This timing service can be used for applications such as network synchronisation or scientific applications.

	The Open Service does not offer integrity information, and the determination of the quality of the signals is left entirely to the users. There is no service guarantee or liability from the Galileo Operating Company on the Open Service.<ref name="ESA_GALILEO">[http://www.esa.int/esaNA/galileo.html ESA Galileo web page]</ref>		The Open Service does not offer integrity information, and the determination of the quality of the signals is left entirely to the users. There is no service guarantee or liability from the Galileo Operating Company on the Open Service.<ref name="ESA_GALILEO">[http://www.esa.int/esaNA/galileo.html ESA Galileo web page]</ref> However, the Open Service will include in the short term an authentication mechanism to called Galileo OS-NMA (Navigation Mechanism). Galileo is the first constellation which will include an NMA mechanism in an Open Service signal.

	The following services are supported by Galileo OS SIS:		The following services are supported by Galileo OS SIS:

Gema.Cueto at 09:42, 14 December 2020

2020-12-14T09:42:13Z

← Older revision		Revision as of 09:42, 14 December 2020
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	The Galileo Open Service is available since December 2016, when the Galileo Initial Services were declared.<ref name ="goes live"> [https://www.gsa.europa.eu/newsroom/news/galileo-goes-live Galileo goes live!] </ref> The services will evolve with the infrastructure deployment until the Full Operational Capability (FOC) is achieved.		The Galileo Open Service is available since December 2016, when the Galileo Initial Services were declared.<ref name ="goes live"> [https://www.gsa.europa.eu/newsroom/news/galileo-goes-live Galileo goes live!] </ref> The services will evolve with the infrastructure deployment until the Full Operational Capability (FOC) is achieved.

			Galileo will include in the short term an authentication mechanism through Galileo OS-NMA.

	==Purpose==		==Purpose==

Gema.Cueto: /* Credits */

2020-03-17T16:27:46Z

Credits

← Older revision		Revision as of 16:27, 17 March 2020
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	==Credits==		==Credits==
	Edited by GMV, using information from ESA and European Union as indicated through the references.		Edited by GMV, using information from ESA, GSA and European Union as indicated through the references.

	==References==		==References==

Gema.Cueto: /* Galileo Signal Frequencies */

2020-03-17T16:21:09Z

Galileo Signal Frequencies

← Older revision		Revision as of 16:21, 17 March 2020
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	==Galileo Signal Frequencies==		==Galileo Signal Frequencies==
	Following image shows the Galileo Signal Frequencies ~~<ref>~~[~~https://galileognss.eu/galileo-frequency-bands/~~]~~</ref>~~		Galileo transmits several signals and codes on four different carrier frequencies within the 1.1 and 1.6 GHz band, namely as:

			* E1, centred at 1575.42 MHz;
			* E5a and E5b, at 1176.45 and 1207.14 MHz respectively, multiplexed together by an AltBOC scheme and transmitted at the E5 carrier frequency centred at 1191.795 MHz;
			* E6, centred at 1278.75 MHz.

			The Galileo SF OS is provided by three of these signals: E1, E5a and E5b, whereas the Galileo DF OS is provided only by each of the following combinations broadcasted by the same satellite:

			* '''E1''' and '''E5a''';
			* '''E1''' and '''E5b'''.

			Following image shows the Galileo Signal Frequencies. See further details on [[Galileo Signal Plan \| Galileo Signal Plan]] article

	[[File:Galileo Signals in Space.png\|300px\|Galileo Signal Frequencies\|centre]]		[[File:Galileo Signals in Space.png\|300px\|Galileo Signal Frequencies\|centre]]


	==Credits==		==Credits==

Gema.Cueto: /* Performance and features */

2020-03-17T16:17:08Z

Performance and features

← Older revision		Revision as of 16:17, 17 March 2020
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	[[File:Galileo_OS_Availability.jpg\|450 px\|center\|Evolution of the Expected Availability of Global		[[File:Galileo_OS_Availability.jpg\|450 px\|center\|Evolution of the Expected Availability of Global
	PDOP\|thumb]]]]		PDOP\|thumb]]

	==Galileo Signal Frequencies==		==Galileo Signal Frequencies==

Gema.Cueto: /* Performance and features */

2020-03-17T16:16:55Z

Performance and features

← Older revision		Revision as of 16:16, 17 March 2020
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	For the Minimum Performance Values expected until this Full Operational Capability is declared, please refer to details in [[Galileo Performances \| Galileo Performances]] article.		For the Minimum Performance Values expected until this Full Operational Capability is declared, please refer to details in [[Galileo Performances \| Galileo Performances]] article.

	Next table presents the expected evolution of the horizontal and vertical position accuracy for the Galileo OS Positioning versus the number of operational healthy satellites.<ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.1.pdf Galileo Open Service SDD]</ref> The values provided are global values, taking into account the constraint of PDOP ≤6.		Next table presents the expected evolution of the horizontal and vertical position accuracy for the Galileo OS Positioning versus the number of operational healthy satellites.<ref name = "GAL OS SDD">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo-OS-SDD_v1.1.pdf Galileo Open Service SDD]</ref> The values provided are global values, taking into account the constraint of PDOP ≤6. Values corresponding to average user location (AUL) and worst user location (WUL) are presented.

	[[File:Galileo_OS_Performance.jpg \|450 px\|center\|Evolution of the Expected Galileo OS Positioning		[[File:Galileo_OS_Performance.jpg \|450 px\|center\|Evolution of the Expected Galileo OS Positioning
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	95% values)\|thumb]]		95% values)\|thumb]]

	With regard to the evolution of the availability performance, the next table summarize the expected figures for 9, 15 and 24 satellites.		With regard to the evolution of the availability performance, the next table summarize the expected figures for 18, 22 and 24 satellites.

	[[File:Galileo_OS_Availability.jpg\|450 px\|center\|Evolution of the Expected Availability of Global		[[File:Galileo_OS_Availability.jpg\|450 px\|center\|Evolution of the Expected Availability of Global