WAAS User Segment - Revision history

Gema.Cueto at 08:55, 16 February 2021

2021-02-16T08:55:03Z

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	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
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	The Wide Area Augmentation System ([[WAAS General Introduction\|WAAS]]) is the United States [[SBAS General Introduction\|Satellite Based Augmentation System]]. The programme, started in 1992, is being carried out by the [http://www.faa.gov/ Federal Aviation Agency (FAA)]<ref name="FAA_NAV_HISTORY">[http://www.faa.gov Navigation Services - History - Satellite Navigation,] [http://www.faa.gov/ FAA.]</ref> and is specially developed for the civil aviation community.<ref name="FAA_WAAS">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/ Navigation Services - Wide Area Augmentation System (WAAS)], [http://www.faa.gov/ FAA.]</ref> The system, which was declared operational in late 2003,<ref name="STANFORD_WAAS">[~~http~~://~~waas~~.stanford.edu/research/waas~~.htm~~ Wide Area Differential GPS (WADGPS), Stanford University]</ref> currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.<ref name="APPROACHES">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/approaches/index.cfm GNSS - GPS/WAAS Approaches,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> WAAS service area includes CONUS, Alaska, Canada and Mexico.<ref name="WAASExpanded">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ WAAS Service Expanded into Canada and Mexico, September 28, 2007,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> The WAAS programme is continuously in evolution; ~~two~~ development phases have been already covered~~, a third is in progress~~, and there are plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.<ref name="EXTENSION">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNav_March08.pdf SatNav News, Vol. 33, March 2008,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref>		The Wide Area Augmentation System ([[WAAS General Introduction\|WAAS]]) is the United States [[SBAS General Introduction\|Satellite Based Augmentation System]]. The programme, started in 1992, is being carried out by the [http://www.faa.gov/ Federal Aviation Agency (FAA)]<ref name="FAA_NAV_HISTORY">[http://www.faa.gov Navigation Services - History - Satellite Navigation,] [http://www.faa.gov/ FAA.]</ref> and is specially developed for the civil aviation community.<ref name="FAA_WAAS">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/ Navigation Services - Wide Area Augmentation System (WAAS)], [http://www.faa.gov/ FAA.]</ref> The system, which was declared operational in late 2003,<ref name="STANFORD_WAAS">[https://gps.stanford.edu/research/currentcontinuing-research/waas-sbas Wide Area Differential GPS (WADGPS), Stanford University]</ref> currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.<ref name="APPROACHES">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/approaches/index.cfm GNSS - GPS/WAAS Approaches,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> WAAS service area includes CONUS, Alaska, Canada and Mexico.<ref name="WAASExpanded">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ WAAS Service Expanded into Canada and Mexico, September 28, 2007,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> The WAAS programme is continuously in evolution; three development phases have been already covered, and there are on-going plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.<ref name="EXTENSION">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNav_March08.pdf SatNav News, Vol. 33, March 2008,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref>

	==WAAS User Segment==		==WAAS User Segment==

Claudia.Prajanu at 13:46, 30 September 2018

2018-09-30T13:46:17Z

← Older revision		Revision as of 13:46, 30 September 2018
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	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	}}		}}
	The Wide Area Augmentation System ([[WAAS General Introduction\|WAAS]]) is the United States [[SBAS General Introduction\|Satellite Based Augmentation System]]. The programme, started in 1992, is being carried out by the [http://www.faa.gov/ Federal Aviation Agency (FAA)]<ref name="FAA_NAV_HISTORY">[http://www.faa.gov~~/about/office_org/headquarters_offices/ato/service_units/techops/navservices/history/satnav/index.cfm~~ Navigation Services - History - Satellite Navigation,] [http://www.faa.gov/ FAA.]</ref> and is specially developed for the civil aviation community.<ref name="FAA_WAAS">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/ Navigation Services - Wide Area Augmentation System (WAAS)], [http://www.faa.gov/ FAA.]</ref> The system, which was declared operational in late 2003,<ref name="STANFORD_WAAS">[http://waas.stanford.edu/research/waas.htm Wide Area Differential GPS (WADGPS), Stanford University]</ref> currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.<ref name="APPROACHES">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/approaches/index.cfm GNSS - GPS/WAAS Approaches,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> WAAS service area includes CONUS, Alaska, Canada and Mexico.<ref name="WAASExpanded">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ WAAS Service Expanded into Canada and Mexico, September 28, 2007,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> The WAAS programme is continuously in evolution; two development phases have been already covered, a third is in progress, and there are plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.<ref name="EXTENSION">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNav_March08.pdf SatNav News, Vol. 33, March 2008,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref>		The Wide Area Augmentation System ([[WAAS General Introduction\|WAAS]]) is the United States [[SBAS General Introduction\|Satellite Based Augmentation System]]. The programme, started in 1992, is being carried out by the [http://www.faa.gov/ Federal Aviation Agency (FAA)]<ref name="FAA_NAV_HISTORY">[http://www.faa.gov Navigation Services - History - Satellite Navigation,] [http://www.faa.gov/ FAA.]</ref> and is specially developed for the civil aviation community.<ref name="FAA_WAAS">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/ Navigation Services - Wide Area Augmentation System (WAAS)], [http://www.faa.gov/ FAA.]</ref> The system, which was declared operational in late 2003,<ref name="STANFORD_WAAS">[http://waas.stanford.edu/research/waas.htm Wide Area Differential GPS (WADGPS), Stanford University]</ref> currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.<ref name="APPROACHES">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/approaches/index.cfm GNSS - GPS/WAAS Approaches,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> WAAS service area includes CONUS, Alaska, Canada and Mexico.<ref name="WAASExpanded">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ WAAS Service Expanded into Canada and Mexico, September 28, 2007,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> The WAAS programme is continuously in evolution; two development phases have been already covered, a third is in progress, and there are plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.<ref name="EXTENSION">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNav_March08.pdf SatNav News, Vol. 33, March 2008,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref>

	==WAAS User Segment==		==WAAS User Segment==
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	The WAAS user segment consists in the GNSS receivers that combine GPS information with the SBAS signal-in-space broadcast by the [[WAAS Space Segment\|WAAS GEO satellites]]. As such, the user segment is not under the control of the WAAS service provider, FAA, and it is driven by the GNSS application market. Although the prime target of WAAS is the civil aviation user community, most of GPS receivers nowadays can be configured to receive and process WAAS signal-in-space (SIS), so they can benefit from the enhanced accuracy and/or integrity offered by WAAS.<ref name="SBAS RECEIVERS">[http://www.egnos-pro.esa.int/SBAS_receivers.pdf List of available SBAS receivers, ESA, March 2006.]</ref>		The WAAS user segment consists in the GNSS receivers that combine GPS information with the SBAS signal-in-space broadcast by the [[WAAS Space Segment\|WAAS GEO satellites]]. As such, the user segment is not under the control of the WAAS service provider, FAA, and it is driven by the GNSS application market. Although the prime target of WAAS is the civil aviation user community, most of GPS receivers nowadays can be configured to receive and process WAAS signal-in-space (SIS), so they can benefit from the enhanced accuracy and/or integrity offered by WAAS.<ref name="SBAS RECEIVERS">[http://www.egnos-pro.esa.int/SBAS_receivers.pdf List of available SBAS receivers, ESA, March 2006.]</ref>

	WAAS users include any aircraft with approved SBAS avionics using a SBAS-enabled GPS receiver. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article [[SBAS Standards]]). The civil aviation certified equipment is in the highest rank with respect its cost. There exist a large number of certified receivers manufacturers worldwide, including:<ref name="WAAS STATUS">[http://www.afceaboston.com~~/documents/events/cnsatm2011/Briefs/03-Wednesday/Wednesday-AM/04-Eldredge-FAA%20SAT%20NAV.pdf~~ WAAS Program Update, 2011, FAA]</ref>		WAAS users include any aircraft with approved SBAS avionics using a SBAS-enabled GPS receiver. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article [[SBAS Standards]]). The civil aviation certified equipment is in the highest rank with respect its cost. There exist a large number of certified receivers manufacturers worldwide, including:<ref name="WAAS STATUS">[http://www.afceaboston.com WAAS Program Update, 2011, FAA]</ref>
	* [http://www.garmin.com/garmin/cms/site/us GARMIN]		* [http://www.garmin.com/garmin/cms/site/us GARMIN]
	* [http://honeywell.com/Pages/Home.aspx Honeywell]		* [http://honeywell.com/Pages/Home.aspx Honeywell]

Filipe.Pelica: Included editor logo.

2014-09-18T17:15:35Z

Included editor logo.

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	\|YearOfPublication=2011		\|YearOfPublication=2011
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Carlos.Lopez at 11:14, 23 February 2012

2012-02-23T11:14:12Z

← Older revision		Revision as of 11:14, 23 February 2012
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	{{Article Infobox2		{{Article Infobox2
	\|Category=WAAS		\|Category=WAAS
	\|Editors=GMV ~~A.D.~~		\|Editors=GMV
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011

Carlos.Lopez at 10:25, 23 February 2012

2012-02-23T10:25:47Z

← Older revision		Revision as of 10:25, 23 February 2012
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	{{Article Infobox2		{{Article Infobox2
	\|Category=WAAS		\|Category=WAAS
	\|~~Authors~~=GMV		\|Editors=GMV A.D.
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
	~~\|Logo=GMV~~
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
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Rui.Pereira at 16:16, 20 January 2012

2012-01-20T16:16:17Z

← Older revision		Revision as of 16:16, 20 January 2012
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	[http://www.faa.gov/aircraft/air_cert/design_approvals/stc/ Aircraft Supplemental Type Certificates (STC)] have been issued by the FAA for an important number of aircraft models equipping WAAS-compliant avionics, including, among others, aircraft from Boeing, Bombardier, Cessna, Embraer, Falcon, Hawker...<ref name="WAAS STATUS"/> Other certificates are in progress including airplanes from other companies such as Airbus or Lockheed Martin.<ref name="WAAS STATUS"/>		[http://www.faa.gov/aircraft/air_cert/design_approvals/stc/ Aircraft Supplemental Type Certificates (STC)] have been issued by the FAA for an important number of aircraft models equipping WAAS-compliant avionics, including, among others, aircraft from Boeing, Bombardier, Cessna, Embraer, Falcon, Hawker...<ref name="WAAS STATUS"/> Other certificates are in progress including airplanes from other companies such as Airbus or Lockheed Martin.<ref name="WAAS STATUS"/>

	Aircraft equipped with WAAS compliant avionics may take benefit from the more than 2000 LPV/LP approaches approved in USA and Canada airports <ref name="APPROACHES"/> (see the article [[~~Work_in_Progress:WAAS_Services\|~~WAAS Services]]).		Aircraft equipped with WAAS compliant avionics may take benefit from the more than 2000 LPV/LP approaches approved in USA and Canada airports <ref name="APPROACHES"/> (see the article [[WAAS Services]]).

Rui.Pereira at 18:11, 8 November 2011

2011-11-08T18:11:45Z

← Older revision		Revision as of 18:11, 8 November 2011
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	{{Article Infobox2		{{Article Infobox2
	\|Category=WAAS		\|Category=WAAS
	~~\|Title={{PAGENAME}}~~
	\|Authors=GMV		\|Authors=GMV
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
	\|Logo=GMV		\|Logo=GMV
			\|Title={{PAGENAME}}
	}}		}}
			The Wide Area Augmentation System ([[WAAS General Introduction\|WAAS]]) is the United States [[SBAS General Introduction\|Satellite Based Augmentation System]]. The programme, started in 1992, is being carried out by the [http://www.faa.gov/ Federal Aviation Agency (FAA)]<ref name="FAA_NAV_HISTORY">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/history/satnav/index.cfm Navigation Services - History - Satellite Navigation,] [http://www.faa.gov/ FAA.]</ref> and is specially developed for the civil aviation community.<ref name="FAA_WAAS">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/ Navigation Services - Wide Area Augmentation System (WAAS)], [http://www.faa.gov/ FAA.]</ref> The system, which was declared operational in late 2003,<ref name="STANFORD_WAAS">[http://waas.stanford.edu/research/waas.htm Wide Area Differential GPS (WADGPS), Stanford University]</ref> currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.<ref name="APPROACHES">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/approaches/index.cfm GNSS - GPS/WAAS Approaches,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> WAAS service area includes CONUS, Alaska, Canada and Mexico.<ref name="WAASExpanded">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ WAAS Service Expanded into Canada and Mexico, September 28, 2007,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> The WAAS programme is continuously in evolution; two development phases have been already covered, a third is in progress, and there are plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.<ref name="EXTENSION">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNav_March08.pdf SatNav News, Vol. 33, March 2008,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref>

	The Wide Area Augmentation System ([[~~Work in Progress:~~WAAS General Introduction\|WAAS]]) is the United States [[SBAS General Introduction\|Satellite Based Augmentation System]]. The programme, started in 1992, is being carried out by the [http://www.faa.gov/ Federal Aviation Agency (FAA)]<ref name="FAA_NAV_HISTORY">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/history/satnav/index.cfm Navigation Services - History - Satellite Navigation,] [http://www.faa.gov/ FAA.]</ref> and is specially developed for the civil aviation community.<ref name="FAA_WAAS">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/ Navigation Services - Wide Area Augmentation System (WAAS)], [http://www.faa.gov/ FAA.]</ref> The system, which was declared operational in late 2003,<ref name="STANFORD_WAAS">[http://waas.stanford.edu/research/waas.htm Wide Area Differential GPS (WADGPS), Stanford University]</ref> currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.<ref name="APPROACHES">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/approaches/index.cfm GNSS - GPS/WAAS Approaches,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> WAAS service area includes CONUS, Alaska, Canada and Mexico.<ref name="WAASExpanded">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ WAAS Service Expanded into Canada and Mexico, September 28, 2007,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref> The WAAS programme is continuously in evolution; two development phases have been already covered, a third is in progress, and there are plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.<ref name="EXTENSION">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNav_March08.pdf SatNav News, Vol. 33, March 2008,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref>

	==WAAS User Segment==		==WAAS User Segment==

	The WAAS user segment consists in the GNSS receivers that combine GPS information with the SBAS signal-in-space broadcast by the [[~~Work in Progress:~~WAAS Space Segment\|WAAS GEO satellites]]. As such, the user segment is not under the control of the WAAS service provider, FAA, and it is driven by the GNSS application market. Although the prime target of WAAS is the civil aviation user community, most of GPS receivers nowadays can be configured to receive and process WAAS signal-in-space (SIS), so they can benefit from the enhanced accuracy and/or integrity offered by WAAS.<ref name="SBAS RECEIVERS">[http://www.egnos-pro.esa.int/SBAS_receivers.pdf List of available SBAS receivers, ESA, March 2006.]</ref>		The WAAS user segment consists in the GNSS receivers that combine GPS information with the SBAS signal-in-space broadcast by the [[WAAS Space Segment\|WAAS GEO satellites]]. As such, the user segment is not under the control of the WAAS service provider, FAA, and it is driven by the GNSS application market. Although the prime target of WAAS is the civil aviation user community, most of GPS receivers nowadays can be configured to receive and process WAAS signal-in-space (SIS), so they can benefit from the enhanced accuracy and/or integrity offered by WAAS.<ref name="SBAS RECEIVERS">[http://www.egnos-pro.esa.int/SBAS_receivers.pdf List of available SBAS receivers, ESA, March 2006.]</ref>

	WAAS users include any aircraft with approved SBAS avionics using a SBAS-enabled GPS receiver. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article [[SBAS Standards]]). The civil aviation certified equipment is in the highest rank with respect its cost. There exist a large number of certified receivers manufacturers worldwide, including:<ref name="WAAS STATUS">[http://www.afceaboston.com/documents/events/cnsatm2011/Briefs/03-Wednesday/Wednesday-AM/04-Eldredge-FAA%20SAT%20NAV.pdf WAAS Program Update, 2011, FAA]</ref>		WAAS users include any aircraft with approved SBAS avionics using a SBAS-enabled GPS receiver. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article [[SBAS Standards]]). The civil aviation certified equipment is in the highest rank with respect its cost. There exist a large number of certified receivers manufacturers worldwide, including:<ref name="WAAS STATUS">[http://www.afceaboston.com/documents/events/cnsatm2011/Briefs/03-Wednesday/Wednesday-AM/04-Eldredge-FAA%20SAT%20NAV.pdf WAAS Program Update, 2011, FAA]</ref>

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

2011-11-01T14:04:24Z

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

← Older revision		Revision as of 14:04, 1 November 2011
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	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	\|Authors=GMV.		\|Authors=GMV
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011

Rui.Pereira: moved Work in Progress:WAAS User Segment to WAAS User Segment

2011-08-05T07:26:22Z

moved Work in Progress:WAAS User Segment to WAAS User Segment

← Older revision	Revision as of 07:26, 5 August 2011
(No difference)

Jose.Caro: /* WAAS User Segment */

2011-07-29T14:59:05Z

WAAS User Segment

← Older revision		Revision as of 14:59, 29 July 2011
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	==WAAS User Segment==		==WAAS User Segment==

	The WAAS user segment consists in the GNSS receivers that combine GPS information with the SBAS signal-in-space broadcast by the [[Work in Progress:WAAS Space Segment\|WAAS GEO satellites]]. As such, the user segment is not under the control of the WAAS service provider, FAA, and it is driven by the GNSS application market. Although the prime target of WAAS is the civil aviation user community, most of GPS receivers nowadays can be configured to receive and process WAAS signal-in-space (SIS), so they can benefit from the enhanced accuracy and/or integrity offered by WAAS.		The WAAS user segment consists in the GNSS receivers that combine GPS information with the SBAS signal-in-space broadcast by the [[Work in Progress:WAAS Space Segment\|WAAS GEO satellites]]. As such, the user segment is not under the control of the WAAS service provider, FAA, and it is driven by the GNSS application market. Although the prime target of WAAS is the civil aviation user community, most of GPS receivers nowadays can be configured to receive and process WAAS signal-in-space (SIS), so they can benefit from the enhanced accuracy and/or integrity offered by WAAS.<ref name="SBAS RECEIVERS">[http://www.egnos-pro.esa.int/SBAS_receivers.pdf List of available SBAS receivers, ESA, March 2006.]</ref>

	WAAS users include any aircraft with approved SBAS avionics using a SBAS-enabled GPS receiver. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article [[SBAS Standards]]). The civil aviation certified equipment is in the highest rank with respect its cost. There exist a large number of certified receivers manufacturers worldwide, including:<ref name="WAAS STATUS">[http://www.afceaboston.com/documents/events/cnsatm2011/Briefs/03-Wednesday/Wednesday-AM/04-Eldredge-FAA%20SAT%20NAV.pdf WAAS Program Update, 2011, FAA]</ref>		WAAS users include any aircraft with approved SBAS avionics using a SBAS-enabled GPS receiver. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article [[SBAS Standards]]). The civil aviation certified equipment is in the highest rank with respect its cost. There exist a large number of certified receivers manufacturers worldwide, including:<ref name="WAAS STATUS">[http://www.afceaboston.com/documents/events/cnsatm2011/Briefs/03-Wednesday/Wednesday-AM/04-Eldredge-FAA%20SAT%20NAV.pdf WAAS Program Update, 2011, FAA]</ref>