WAAS Architecture - Revision history

Gema.Cueto at 09:09, 16 February 2021

2021-02-16T09:09:05Z

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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 Architecture==		==WAAS Architecture==

Claudia.Prajanu at 10:25, 28 September 2018

2018-09-28T10:25:47Z

← Older revision		Revision as of 10:25, 28 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 Architecture==		==WAAS Architecture==

Filipe.Pelica: Included editor logo.

2014-09-18T17:19:11Z

Included editor logo.

← Older revision		Revision as of 17:19, 18 September 2014
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Carlos.Lopez at 11:13, 23 February 2012

2012-02-23T11:13:43Z

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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 10:24, 23 February 2012

2012-02-23T10:24:34Z

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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}}
	}}		}}

Jose.Caro at 11:28, 4 December 2011

2011-12-04T11:28:55Z

← Older revision		Revision as of 11:28, 4 December 2011
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	The main layers of WAAS architecture are:		The main layers of WAAS architecture are:

	*[[WAAS Ground Segment\|WAAS Ground Segment]]: The WAAS ground segment encompasses reference stations (Wide-area Reference Stations, WRS), master stations (WAAS Master Stations, WMS), uplink stations (Ground Uplink Stations, GUS), and operational centers. The ~~signals from GPS satellites are collected by the many widely-spaced~~ Wide-area Reference Stations ~~(WRS). The WRS collected data~~ are ~~forwarded~~ to the ~~WAAS Master Station (~~WMS~~) via a terrestrial communications network~~. At the ~~WMS,~~ the ~~WAAS~~ augmentation ~~messages are generated,~~ and ~~send them~~ to ~~two pairs of~~ Ground Uplink Stations ~~(GUS), which then transmit~~ to ~~navigation payloads on Geostationary communications~~ satellites (WAAS Space ~~segment~~) for ~~rebroadcast to~~ the User ~~segment~~.<ref name=WAASWorks/>		*[[WAAS Ground Segment\|WAAS Ground Segment]]: The WAAS ground segment encompasses reference stations (Wide-area Reference Stations, WRS), master stations (WAAS Master Stations, WMS), uplink stations (Ground Uplink Stations, GUS), and operational centers. The Wide-area Reference Stations, which are positioned with high precision, collect the signals transmitted by the GPS satellites and send this information to the WMS. The WMS processes all the data to build the augmentation message that will contain corrections to the GPS data and confidence limits to such corrections. The message generated by the WMS is uplinked from the Ground Uplink Stations to the WAAS GEO satellites (WAAS Space Segment), which will broadcast it across the GEO footprint for the benefit of the WAAS users (WAAS User Segment).<ref name=WAASWorks/>

	*[[WAAS Space Segment\|WAAS Space Segment]]: The space segment is composed of multiple geosynchronous communication satellites (GEO) with navigation payloads that broadcast the WAAS augmentation messages generated by the WMS to the User segment.		*[[WAAS Space Segment\|WAAS Space Segment]]: The space segment is composed of multiple geosynchronous communication satellites (GEO) with navigation payloads that broadcast the WAAS augmentation messages generated by the WMS to the User segment.

Rui.Pereira at 18:21, 8 November 2011

2011-11-08T18:21:09Z

← Older revision		Revision as of 18:21, 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 Architecture==		==WAAS Architecture==
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	The main layers of WAAS architecture are:		The main layers of WAAS architecture are:

	*[[~~Work in Progress:~~WAAS Ground Segment\|WAAS Ground Segment]]: The WAAS ground segment encompasses reference stations (Wide-area Reference Stations, WRS), master stations (WAAS Master Stations, WMS), uplink stations (Ground Uplink Stations, GUS), and operational centers. The signals from GPS satellites are collected by the many widely-spaced Wide-area Reference Stations (WRS). The WRS collected data are forwarded to the WAAS Master Station (WMS) via a terrestrial communications network. At the WMS, the WAAS augmentation messages are generated, and send them to two pairs of Ground Uplink Stations (GUS), which then transmit to navigation payloads on Geostationary communications satellites (WAAS Space segment) for rebroadcast to the User segment.<ref name=WAASWorks/>		*[[WAAS Ground Segment\|WAAS Ground Segment]]: The WAAS ground segment encompasses reference stations (Wide-area Reference Stations, WRS), master stations (WAAS Master Stations, WMS), uplink stations (Ground Uplink Stations, GUS), and operational centers. The signals from GPS satellites are collected by the many widely-spaced Wide-area Reference Stations (WRS). The WRS collected data are forwarded to the WAAS Master Station (WMS) via a terrestrial communications network. At the WMS, the WAAS augmentation messages are generated, and send them to two pairs of Ground Uplink Stations (GUS), which then transmit to navigation payloads on Geostationary communications satellites (WAAS Space segment) for rebroadcast to the User segment.<ref name=WAASWorks/>

	*[[~~Work in Progress:~~WAAS Space Segment\|WAAS Space Segment]]: The space segment is composed of multiple geosynchronous communication satellites (GEO) with navigation payloads that broadcast the WAAS augmentation messages generated by the WMS to the User segment.		*[[WAAS Space Segment\|WAAS Space Segment]]: The space segment is composed of multiple geosynchronous communication satellites (GEO) with navigation payloads that broadcast the WAAS augmentation messages generated by the WMS to the User segment.

	*[[~~Work in Progress:~~WAAS User Segment\|WAAS User Segment]]: The user segment is usually any aircraft with approved WAAS avionics, i.e. with a WAAS-enabled GPS receiver that used the WAAS corrections from the Space segment. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article SBAS Standards).		*[[WAAS User Segment\|WAAS User Segment]]: The user segment is usually any aircraft with approved WAAS avionics, i.e. with a WAAS-enabled GPS receiver that used the WAAS corrections from the Space segment. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article SBAS Standards).

	==Notes==		==Notes==

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

2011-11-01T13:50:45Z

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

← Older revision		Revision as of 13:50, 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 Architecture to WAAS Architecture

2011-08-05T07:18:20Z

moved Work in Progress:WAAS Architecture to WAAS Architecture

← Older revision	Revision as of 07:18, 5 August 2011
(No difference)

Jose.Caro: Created page with "{{Article Infobox2 |Category=WAAS |Title={{PAGENAME}} |Authors=GMV. |Level=Basic |YearOfPublication=2011 |Logo=GMV }} The Wide Area Augmentation System ([[Work in Progress:WAAS ..."

2011-07-29T11:00:50Z

Created page with "{{Article Infobox2 |Category=WAAS |Title={{PAGENAME}} |Authors=GMV. |Level=Basic |YearOfPublication=2011 |Logo=GMV }} The Wide Area Augmentation System ([[Work in Progress:WAAS ..."

New page

{{Article Infobox2
|Category=WAAS
|Title={{PAGENAME}}
|Authors=GMV.
|Level=Basic
|YearOfPublication=2011
|Logo=GMV
}}

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 Architecture==
WAAS works by processing GPS data collected by a network of reference stations to generate the SBAS message which is uploaded to the GEO satellites. The GEO satellites broadcast this information to the user receivers, which compute the aircraft positioning and inform on potential alert messages.<ref name=WAASWorks>[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/howitworks/ FAA WAAS: How it works]</ref>
[[File:FAA WAAS System Overview.jpg|WAAS System|300px|thumb]]

The main layers of WAAS architecture are:

*[[Work in Progress:WAAS Ground Segment|WAAS Ground Segment]]: The WAAS ground segment encompasses reference stations (Wide-area Reference Stations, WRS), master stations (WAAS Master Stations, WMS), uplink stations (Ground Uplink Stations, GUS), and operational centers. The signals from GPS satellites are collected by the many widely-spaced Wide-area Reference Stations (WRS). The WRS collected data are forwarded to the WAAS Master Station (WMS) via a terrestrial communications network. At the WMS, the WAAS augmentation messages are generated, and send them to two pairs of Ground Uplink Stations (GUS), which then transmit to navigation payloads on Geostationary communications satellites (WAAS Space segment) for rebroadcast to the User segment.<ref name=WAASWorks/>

*[[Work in Progress:WAAS Space Segment|WAAS Space Segment]]: The space segment is composed of multiple geosynchronous communication satellites (GEO) with navigation payloads that broadcast the WAAS augmentation messages generated by the WMS to the User segment.

*[[Work in Progress:WAAS User Segment|WAAS User Segment]]: The user segment is usually any aircraft with approved WAAS avionics, i.e. with a WAAS-enabled GPS receiver that used the WAAS corrections from the Space segment. The WAAS user equipment shall be compliant (certified) against several standards, i.e. RTCA MOPS DO 229 (see article SBAS Standards).

==Notes==
<references group="footnotes"/>
==References==
<references/>

[[Category:WAAS]]