EGNOS User Segment - Revision history

Gema.Cueto: Updated reference ICD/SDD links

2026-04-19T21:02:47Z

Updated reference ICD/SDD links

← Older revision		Revision as of 21:02, 19 April 2026
Line 21:		Line 21:
	clock bias) in a given geographical coordinate reference frame.<ref name=" EGNOS SoL SDD"/>		clock bias) in a given geographical coordinate reference frame.<ref name=" EGNOS SoL SDD"/>

	The estimation of the satellite-to-user range is based on the measurement of the propagation time of the signal and a number of error sources affect the accuracy of these measurements:<ref name=" EGNOS SoL SDD">[~~http~~://~~www~~.~~essp~~-~~sas~~.eu/~~service_definition_documents~~ EGNOS Safety of Life (SoL) Service Definition Document (SDD) ]</ref>		The estimation of the satellite-to-user range is based on the measurement of the propagation time of the signal and a number of error sources affect the accuracy of these measurements:<ref name=" EGNOS SoL SDD">[https://egnos.gsc-europa.eu/sites/default/files/documents/egnos_sol_sdd_in_force.pdf?v=1726657048 EGNOS Safety of Life (SoL) Service Definition Document (SDD) ]</ref>
	* Satellite clocks: any error in the synchronisation of the different satellite clocks will have a direct effect on the range measurement accuracy. These errors are similar for all users able to view a given satellite.		* Satellite clocks: any error in the synchronisation of the different satellite clocks will have a direct effect on the range measurement accuracy. These errors are similar for all users able to view a given satellite.
	* Signal distortions: any failure affecting the shape of the broadcast signal may have an impact on the propagation time determination in the user receiver.		* Signal distortions: any failure affecting the shape of the broadcast signal may have an impact on the propagation time determination in the user receiver.

Claudia.Prajanu at 18:13, 29 July 2018

2018-07-29T18:13:09Z

← Older revision		Revision as of 18:13, 29 July 2018
Line 9:		Line 9:
	The EGNOS User segment is made of EGNOS receivers that enable their users to [[Accuracy\|accurately]] compute their positions with [[Integrity\|integrity]].		The EGNOS User segment is made of EGNOS receivers that enable their users to [[Accuracy\|accurately]] compute their positions with [[Integrity\|integrity]].

	To receive EGNOS signals, an EGNOS compatible receiver is required; they are already available on the market from a variety of manufacturers. An EGNOS receiver is like a GPS receiver but with special software inside that allows the receiver to lock onto the code used by the EGNOS satellites and compute the EGNOS corrections to the GPS signals. An EGNOS receiver is the same size as a GPS receiver and uses the same type of antenna.<ref name=" ESA Navigation Portal">[~~http~~://egnos-~~portal~~.~~gsa.europa~~.eu/~~discover-egnos/programme-information~~/~~evolution~~ ESA Navigation Portal on EGNOS User Segment ]</ref>		To receive EGNOS signals, an EGNOS compatible receiver is required; they are already available on the market from a variety of manufacturers. An EGNOS receiver is like a GPS receiver but with special software inside that allows the receiver to lock onto the code used by the EGNOS satellites and compute the EGNOS corrections to the GPS signals. An EGNOS receiver is the same size as a GPS receiver and uses the same type of antenna.<ref name=" ESA Navigation Portal">[https://egnos-user-support.essp-sas.eu/new_egnos_ops/ ESA Navigation Portal on EGNOS User Segment ]</ref>

	==EGNOS Receivers and User Applications==		==EGNOS Receivers and User Applications==

Filipe.Pelica: Included editor logo.

2014-09-18T17:05:34Z

Included editor logo.

← Older revision		Revision as of 17:05, 18 September 2014
Line 4:		Line 4:
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
			\|Logo=GMV
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	}}		}}

Carlos.Lopez at 11:12, 23 February 2012

2012-02-23T11:12:46Z

← Older revision		Revision as of 11:12, 23 February 2012
Line 1:		Line 1:
	{{Article Infobox2		{{Article Infobox2
	\|Category=EGNOS		\|Category=EGNOS
	\|Editors=GMV ~~A.D.~~		\|Editors=GMV
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011

Carlos.Lopez at 10:23, 23 February 2012

2012-02-23T10:23:20Z

← Older revision		Revision as of 10:23, 23 February 2012
Line 1:		Line 1:
	{{Article Infobox2		{{Article Infobox2
	\|Category=EGNOS		\|Category=EGNOS
	\|~~Authors~~=~~Edited by~~ GMV		\|Editors=GMV A.D.
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
	~~\|Logo=GMV~~
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	}}		}}

Jose.Caro at 14:54, 30 November 2011

2011-11-30T14:54:13Z

← Older revision		Revision as of 14:54, 30 November 2011
Line 1:		Line 1:
	{{Article Infobox2		{{Article Infobox2
	\|Category=EGNOS		\|Category=EGNOS
	~~\|Title={{PAGENAME}}~~		\|Authors=Edited by GMV
	\|Authors=GMV
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
	\|Logo=GMV		\|Logo=GMV
			\|Title={{PAGENAME}}
	}}		}}


	The EGNOS User segment is made of EGNOS receivers that enable their users to [[Accuracy\|accurately]] compute their positions with [[Integrity\|integrity]].		The EGNOS User segment is made of EGNOS receivers that enable their users to [[Accuracy\|accurately]] compute their positions with [[Integrity\|integrity]].

Line 21:		Line 19:
	==Errors Affecting User Positioning==		==Errors Affecting User Positioning==
	A GNSS receiver processes the individual satellite range measurements and combines them to compute an estimate of the user position (latitude, longitude, altitude, and user		A GNSS receiver processes the individual satellite range measurements and combines them to compute an estimate of the user position (latitude, longitude, altitude, and user
	clock bias) in a given geographical coordinate reference frame.		clock bias) in a given geographical coordinate reference frame.<ref name=" EGNOS SoL SDD"/>

	The estimation of the satellite-to-user range is based on the measurement of the propagation time of the signal and a number of error sources affect the accuracy of these measurements:<ref name=" EGNOS SoL SDD">[http://www.essp-sas.eu/service_definition_documents EGNOS Safety of Life (SoL) Service Definition Document (SDD) ]</ref>		The estimation of the satellite-to-user range is based on the measurement of the propagation time of the signal and a number of error sources affect the accuracy of these measurements:<ref name=" EGNOS SoL SDD">[http://www.essp-sas.eu/service_definition_documents EGNOS Safety of Life (SoL) Service Definition Document (SDD) ]</ref>
Line 33:		Line 31:

	When computing its position the user receiver combines the range measurements from the different satellites in view. Through this process, the individual errors affecting each range measurement are combined which results in an aggregate error in the position domain. The statistical relationship between the average range domain error and the position error is given by a factor that depends on the satellite geometry; this factor is named DOP ([[Positioning Error\|Dilution Of Precision]]).		When computing its position the user receiver combines the range measurements from the different satellites in view. Through this process, the individual errors affecting each range measurement are combined which results in an aggregate error in the position domain. The statistical relationship between the average range domain error and the position error is given by a factor that depends on the satellite geometry; this factor is named DOP ([[Positioning Error\|Dilution Of Precision]]).

			==Credits==
			This article contains some verbatim extracts taken from ESA navigation web pages<ref name=" ESA Navigation Portal"/> and EGNOS SoL Service Definition Document<ref name=" EGNOS SoL SDD"/> according to the references cited.

	==Notes==		==Notes==

Timo.Kouwenhoven: Text replace - "|Authors=GMV." to "|Authors=GMV"

2011-11-01T13:48:34Z

Text replace - "|Authors=GMV." to "|Authors=GMV"

← Older revision		Revision as of 13:48, 1 November 2011
Line 2:		Line 2:
	\|Category=EGNOS		\|Category=EGNOS
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	\|Authors=GMV.		\|Authors=GMV
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011

Carlos.Lopez at 14:33, 8 August 2011

2011-08-08T14:33:56Z

← Older revision		Revision as of 14:33, 8 August 2011
Line 32:		Line 32:
	* Thermal noise, interference and user receiver design: the navigation signals have an extremely low power level when they reach the user receiver.		* Thermal noise, interference and user receiver design: the navigation signals have an extremely low power level when they reach the user receiver.

	When computing its position the user receiver combines the range measurements from the different satellites in view. Through this process, the individual errors affecting each range measurement are combined which results in an aggregate error in the position domain. The statistical relationship between the average range domain error and the position error is given by a factor that depends on the satellite geometry; this factor is named DOP ([[~~Predicted Accuracy: Dilution of Precision~~\|Dilution Of Precision]]).		When computing its position the user receiver combines the range measurements from the different satellites in view. Through this process, the individual errors affecting each range measurement are combined which results in an aggregate error in the position domain. The statistical relationship between the average range domain error and the position error is given by a factor that depends on the satellite geometry; this factor is named DOP ([[Positioning Error\|Dilution Of Precision]]).

	==Notes==		==Notes==

Jose.Caro at 13:43, 12 July 2011

2011-07-12T13:43:09Z

Rui.Pereira: moved Work in Progress:EGNOS User Segment to EGNOS User Segment over redirect

2011-05-27T15:39:57Z

moved Work in Progress:EGNOS User Segment to EGNOS User Segment over redirect

← Older revision	Revision as of 15:39, 27 May 2011
(No difference)

← Older revision		Revision as of 13:43, 12 July 2011
Line 15:		Line 15:
	==EGNOS Receivers and User Applications==		==EGNOS Receivers and User Applications==

	The European GNSS Agency (GSA)<ref name=" European GNSS Agency (GSA)">[http://www.gsa.europa.eu/ European GNSS Agency (GSA) ]</ref> and other institutions involved in the GNSS Industry have extensively worked on the definition of communication protocols, specification and user performances for EGNOS ~~Compatible~~ [[EGNOS Receivers \| ~~Receivers~~]].		The European GNSS Agency (GSA)<ref name=" European GNSS Agency (GSA)">[http://www.gsa.europa.eu/ European GNSS Agency (GSA) ]</ref> and other institutions involved in the GNSS Industry have extensively worked on the definition of communication protocols, specification and user performances for EGNOS compatible [[EGNOS Receivers \| receivers]].

	Among the endless applications within the EGNOS ~~User Segment~~, [[ SISNET \| SISNeT]] is a remarkable technology that combines the powerful capabilities of satellite navigation and the Internet. The highly accurate navigation information that comes from the EGNOS (European Geostationary Navigation Overlay Service) Signal-In-Space (SIS) is now available over the Internet and in real time via SISNeT.<ref name=" ESA Portal on SISNeT Project">[http://www.egnos-pro.esa.int/sisnet/index.html ESA Portal on SISNeT Project ]</ref>		Among the endless applications within the EGNOS user segment, [[ SISNET \| SISNeT]] is a remarkable technology that combines the powerful capabilities of satellite navigation and the Internet. The highly accurate navigation information that comes from the EGNOS (European Geostationary Navigation Overlay Service) Signal-In-Space (SIS) is now available over the Internet and in real time via SISNeT.<ref name=" ESA Portal on SISNeT Project">[http://www.egnos-pro.esa.int/sisnet/index.html ESA Portal on SISNeT Project ]</ref>

	==Errors Affecting User Positioning==		==Errors Affecting User Positioning==
Line 27:		Line 27:
	* Signal distortions: any failure affecting the shape of the broadcast signal may have an impact on the propagation time determination in the user receiver.		* Signal distortions: any failure affecting the shape of the broadcast signal may have an impact on the propagation time determination in the user receiver.
	* Satellite position errors: if the spacecraft orbits are not properly determined by the system’s ground segment, the user will not be able to precisely establish the spacecraft location at any given point in time. This will introduce an error when computing the user position. The size of the error affecting the range measurements depends on the user’s location.		* Satellite position errors: if the spacecraft orbits are not properly determined by the system’s ground segment, the user will not be able to precisely establish the spacecraft location at any given point in time. This will introduce an error when computing the user position. The size of the error affecting the range measurements depends on the user’s location.
	* Ionospheric effects: The ~~Ionosphere~~ is ~~an ionized~~ layer of the atmosphere located ~~a few hundred~~ kilometres ~~above the surface of the Earth~~. When ~~transiting~~ through the ionosphere, ~~the satellite~~ navigation signals are ~~perturbed~~, resulting in range measurement errors.		* Ionospheric effects: The ionosphere is the ionised layer of the Earth atmosphere located from around 60 kilometres to several thousand kilometres. When propagation through the ionosphere, navigation signals are disturbed, resulting in range measurement errors or reduced availability. Please refer to the article ''[[Ionospheric Delay]]'' for further information.
	* Tropospheric effects: The troposphere is the lower part of the atmosphere where most weather phenomena take place. The signal propagation in this region will be affected by specific atmospheric conditions (e.g. temperature, humidity…) and will result in range measurement errors.		* Tropospheric effects: The troposphere is the lower part of the atmosphere where most weather phenomena take place. The signal propagation in this region will be affected by specific atmospheric conditions (e.g. temperature, humidity…) and will result in range measurement errors. Tropospheric effects are further described in the article ''[[Tropospheric Delay]]''.
	* ~~Reflections~~: When propagating ~~towards~~ the user receiver, navigation signals are prone to reflections from the ground or nearby objects (buildings, vehicles...).		* Local effects: When propagating in the local environment of a user receiver, navigation signals are prone to reflections or obstructions from the ground or nearby objects (buildings, vehicles...).
	* Thermal noise, ~~Interference~~ and ~~User~~ receiver design: the navigation signals have an extremely low power level when they reach the user receiver.		* Thermal noise, interference and user receiver design: the navigation signals have an extremely low power level when they reach the user receiver.

	When computing its position the user receiver combines the range measurements from the different satellites in view. Through this process, the individual errors affecting each range measurement are combined which results in an aggregate error in the position domain. The statistical relationship between the average range domain error and the position error is given by a factor that depends on the satellite geometry; this factor is named DOP (Dilution Of Precision).		When computing its position the user receiver combines the range measurements from the different satellites in view. Through this process, the individual errors affecting each range measurement are combined which results in an aggregate error in the position domain. The statistical relationship between the average range domain error and the position error is given by a factor that depends on the satellite geometry; this factor is named DOP ([[Predicted Accuracy: Dilution of Precision\|Dilution Of Precision]]).

	==Notes==		==Notes==