WAAS Services - Revision history

Gema.Cueto: Updated reference ICD/SDD links

2026-04-19T21:55:45Z

Updated reference ICD/SDD links

← Older revision		Revision as of 21:55, 19 April 2026
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	The objectives of the WAAS are to provide improved [[Integrity\|integrity]], [[Accuracy\|accuracy]], [[Availability\|availability]], and [[Continuity\|continuity]] of service to the [[GPS Services\|GPS Standard Positioning Service]] (SPS) for the Civil Aviation community. The ultimate objective is to provide a navigation system for all phases of flight through precision approach.<ref name=SpecWAAS>[http://www.faa.gov ''Specification for the Wide Area Augmentation System(WAAS)''], FAA-E- 2892b, August 13, 2001.</ref>		The objectives of the WAAS are to provide improved [[Integrity\|integrity]], [[Accuracy\|accuracy]], [[Availability\|availability]], and [[Continuity\|continuity]] of service to the [[GPS Services\|GPS Standard Positioning Service]] (SPS) for the Civil Aviation community. The ultimate objective is to provide a navigation system for all phases of flight through precision approach.<ref name=SpecWAAS>[http://www.faa.gov ''Specification for the Wide Area Augmentation System(WAAS)''], FAA-E- 2892b, August 13, 2001.</ref>

	The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/><ref>[https://~~www~~.gps.gov/technical/ps/2008-WAAS-performance-standard.pdf WAAS Performance Standard]</ref>		The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/><ref>[https://archive.gps.gov/technical/ps/2008-WAAS-performance-standard.pdf WAAS Performance Standard]</ref>

	In order to take benefit from the signal in space provided by WAAS, aircraft need to be equipped with certified receivers meeting the corresponding standards, i.e. RTCA MOPS DO 229 for current WAAS services or the future SBAS DFMC standards for next evolutions of WAAS (see article [[SBAS Standards]]).		In order to take benefit from the signal in space provided by WAAS, aircraft need to be equipped with certified receivers meeting the corresponding standards, i.e. RTCA MOPS DO 229 for current WAAS services or the future SBAS DFMC standards for next evolutions of WAAS (see article [[SBAS Standards]]).

Gema.Cueto at 09:11, 16 February 2021

2021-02-16T09:11:11Z

← Older revision		Revision as of 09:11, 16 February 2021
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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 and operated 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; ~~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 and operated 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>

	It currently achieves excellent coverage over the vast majority of North America, providing corrections to the GPS L1 signal. However, when the ionosphere is disturbed or when the constellation is weak, its availability may be reduced. Using both the L1 and L5 signals in the aircraft will remove the primary dependence on the state of the ionosphere. Removing this largest source of uncertainty allows service to be provided under more conditions than are allowed today. Thus, the use of L1 and L5 together as it is being defined in the evolution of SBAS standards will provide very robust coverage of vertical guidance.<ref name="article">[https://www.researchgate.net/profile/Todd_Walter/publication/261537494_Evolving_WAAS_to_serve_L1L5_users/links/5a6a0f5c4585154d15466882/Evolving-WAAS-to-serve-L1-L5-users.pdf Todd Walter, Juan Blanch, R. Eric Phelts, and Per Enge, "Evolving WAAS to Serve L1/L5 Users", Stanford University, 2020]</ref>		It currently achieves excellent coverage over the vast majority of North America, providing corrections to the GPS L1 signal. However, when the ionosphere is disturbed or when the constellation is weak, its availability may be reduced. Using both the L1 and L5 signals in the aircraft will remove the primary dependence on the state of the ionosphere. Removing this largest source of uncertainty allows service to be provided under more conditions than are allowed today. Thus, the use of L1 and L5 together as it is being defined in the evolution of SBAS standards will provide very robust coverage of vertical guidance.<ref name="article">[https://www.researchgate.net/profile/Todd_Walter/publication/261537494_Evolving_WAAS_to_serve_L1L5_users/links/5a6a0f5c4585154d15466882/Evolving-WAAS-to-serve-L1-L5-users.pdf Todd Walter, Juan Blanch, R. Eric Phelts, and Per Enge, "Evolving WAAS to Serve L1/L5 Users", Stanford University, 2020]</ref>

Gema.Cueto at 13:27, 27 January 2021

2021-01-27T13:27:15Z

← Older revision		Revision as of 13:27, 27 January 2021
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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 and operated 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 and operated 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; 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>

	It currently achieves excellent coverage over the vast majority of North America, providing corrections to the GPS L1 signal. However, when the ionosphere is disturbed or when the constellation is weak, its availability may be reduced. Using both the L1 and L5 signals in the aircraft will remove the primary dependence on the state of the ionosphere. Removing this largest source of uncertainty allows service to be provided under more conditions than are allowed today. Thus, the use of L1 and L5 together as it is being defined in the evolution of SBAS standards will provide very robust coverage of vertical guidance.<ref name="article">[https://www.researchgate.net/profile/Todd_Walter/publication/261537494_Evolving_WAAS_to_serve_L1L5_users/links/5a6a0f5c4585154d15466882/Evolving-WAAS-to-serve-L1-L5-users.pdf Todd Walter, Juan Blanch, R. Eric Phelts, and Per Enge, "Evolving WAAS to Serve L1/L5 Users", Stanford University, 2020]</ref>		It currently achieves excellent coverage over the vast majority of North America, providing corrections to the GPS L1 signal. However, when the ionosphere is disturbed or when the constellation is weak, its availability may be reduced. Using both the L1 and L5 signals in the aircraft will remove the primary dependence on the state of the ionosphere. Removing this largest source of uncertainty allows service to be provided under more conditions than are allowed today. Thus, the use of L1 and L5 together as it is being defined in the evolution of SBAS standards will provide very robust coverage of vertical guidance.<ref name="article">[https://www.researchgate.net/profile/Todd_Walter/publication/261537494_Evolving_WAAS_to_serve_L1L5_users/links/5a6a0f5c4585154d15466882/Evolving-WAAS-to-serve-L1-L5-users.pdf Todd Walter, Juan Blanch, R. Eric Phelts, and Per Enge, "Evolving WAAS to Serve L1/L5 Users", Stanford University, 2020]</ref>

Gema.Cueto: /* WAAS Services */

2020-12-16T12:02:29Z

WAAS Services

← Older revision		Revision as of 12:02, 16 December 2020
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	The objectives of the WAAS are to provide improved [[Integrity\|integrity]], [[Accuracy\|accuracy]], [[Availability\|availability]], and [[Continuity\|continuity]] of service to the [[GPS Services\|GPS Standard Positioning Service]] (SPS) for the Civil Aviation community. The ultimate objective is to provide a navigation system for all phases of flight through precision approach.<ref name=SpecWAAS>[http://www.faa.gov ''Specification for the Wide Area Augmentation System(WAAS)''], FAA-E- 2892b, August 13, 2001.</ref>		The objectives of the WAAS are to provide improved [[Integrity\|integrity]], [[Accuracy\|accuracy]], [[Availability\|availability]], and [[Continuity\|continuity]] of service to the [[GPS Services\|GPS Standard Positioning Service]] (SPS) for the Civil Aviation community. The ultimate objective is to provide a navigation system for all phases of flight through precision approach.<ref name=SpecWAAS>[http://www.faa.gov ''Specification for the Wide Area Augmentation System(WAAS)''], FAA-E- 2892b, August 13, 2001.</ref>

	The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/>		The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/><ref>[https://www.gps.gov/technical/ps/2008-WAAS-performance-standard.pdf WAAS Performance Standard]</ref>

	In order to take benefit from the signal in space provided by WAAS, aircraft need to be equipped with certified receivers meeting the corresponding standards, i.e. RTCA MOPS DO 229 for current WAAS services or the future SBAS DFMC standards for next evolutions of WAAS (see article [[SBAS Standards]]).		In order to take benefit from the signal in space provided by WAAS, aircraft need to be equipped with certified receivers meeting the corresponding standards, i.e. RTCA MOPS DO 229 for current WAAS services or the future SBAS DFMC standards for next evolutions of WAAS (see article [[SBAS Standards]]).

Gema.Cueto: /* WAAS Services */

2020-12-16T11:59:47Z

WAAS Services

← Older revision		Revision as of 11:59, 16 December 2020
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	On July 10, 2003, the WAAS system was declared operational for safety-of-life aviation, with a service area consisting in 95% of the United States, and part of Alaska,<ref name="STANFORD_WAAS"/><ref>[http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System Wide Area Augmentation System in Wikipedia]</ref> to be expanded in 2007 to include Canada and Mexico.<ref name="EXTENSION"/> At present, WAAS supports en-route, terminal and approach operations down to a full LPV-200 (CAT-I like Approach Capability) for the WAAS service area that includes CONUS, Alaska and Canada.<ref name="APPROACHES"/><ref name="WAASExpanded"/>		On July 10, 2003, the WAAS system was declared operational for safety-of-life aviation, with a service area consisting in 95% of the United States, and part of Alaska,<ref name="STANFORD_WAAS"/><ref>[http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System Wide Area Augmentation System in Wikipedia]</ref> to be expanded in 2007 to include Canada and Mexico.<ref name="EXTENSION"/> At present, WAAS supports en-route, terminal and approach operations down to a full LPV-200 (CAT-I like Approach Capability) for the WAAS service area that includes CONUS, Alaska and Canada.<ref name="APPROACHES"/><ref name="WAASExpanded"/>

	Currently, WAAS supports the following flight procedures:<ref name="APPROACHES"/><ref>[http://aviationglossary.com Aviation Glossary]</ref>		Currently, WAAS supports the following flight procedures, as well as airport departures and airport arrivals:<ref name="APPROACHES"/><ref>[http://aviationglossary.com Aviation Glossary]</ref>
	* LNAV (Lateral Navigation).		* LNAV (Lateral Navigation).
	* LNAV/VNAV (Lateral Navigation/Vertical Navigation).		* LNAV/VNAV (Lateral Navigation/Vertical Navigation).
	* LP (Localizer Performance).		* LP (Localizer Performance).
	* LPV (Localizer Performance with Vertical guidance).		* LPV (Localizer Performance with Vertical guidance).

			The WAAS service is interoperable with other regional SBAS services, including those operated by Japan (MSAS), Europe (EGNOS), and India (GAGAN).

	==Notes==		==Notes==

Gema.Cueto: /* WAAS Services */

2020-12-16T11:59:02Z

WAAS Services

← Older revision		Revision as of 11:59, 16 December 2020
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	The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/>		The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/>

	In order to take benefit from the signal in space provided by WAAS, aircraft need to be equipped with certified receivers meeting the corresponding standards, i.e. RTCA MOPS DO 229 (see article [[SBAS Standards]]).		In order to take benefit from the signal in space provided by WAAS, aircraft need to be equipped with certified receivers meeting the corresponding standards, i.e. RTCA MOPS DO 229 for current WAAS services or the future SBAS DFMC standards for next evolutions of WAAS (see article [[SBAS Standards]]).

	On July 10, 2003, the WAAS system was declared operational for safety-of-life aviation, with a service area consisting in 95% of the United States, and part of Alaska,<ref name="STANFORD_WAAS"/><ref>[http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System Wide Area Augmentation System in Wikipedia]</ref> to be expanded in 2007 to include Canada and Mexico.<ref name="EXTENSION"/> At present, WAAS supports en-route, terminal and approach operations down to a full LPV-200 (CAT-I like Approach Capability) for the WAAS service area that includes CONUS, Alaska and Canada.<ref name="APPROACHES"/><ref name="WAASExpanded"/>		On July 10, 2003, the WAAS system was declared operational for safety-of-life aviation, with a service area consisting in 95% of the United States, and part of Alaska,<ref name="STANFORD_WAAS"/><ref>[http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System Wide Area Augmentation System in Wikipedia]</ref> to be expanded in 2007 to include Canada and Mexico.<ref name="EXTENSION"/> At present, WAAS supports en-route, terminal and approach operations down to a full LPV-200 (CAT-I like Approach Capability) for the WAAS service area that includes CONUS, Alaska and Canada.<ref name="APPROACHES"/><ref name="WAASExpanded"/>
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	* LP (Localizer Performance).		* LP (Localizer Performance).
	* LPV (Localizer Performance with Vertical guidance).		* LPV (Localizer Performance with Vertical guidance).


	==Notes==		==Notes==

Gema.Cueto at 11:57, 16 December 2020

2020-12-16T11:57:52Z

← Older revision		Revision as of 11:57, 16 December 2020
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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 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 and operated 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>

			It currently achieves excellent coverage over the vast majority of North America, providing corrections to the GPS L1 signal. However, when the ionosphere is disturbed or when the constellation is weak, its availability may be reduced. Using both the L1 and L5 signals in the aircraft will remove the primary dependence on the state of the ionosphere. Removing this largest source of uncertainty allows service to be provided under more conditions than are allowed today. Thus, the use of L1 and L5 together as it is being defined in the evolution of SBAS standards will provide very robust coverage of vertical guidance.<ref name="article">[https://www.researchgate.net/profile/Todd_Walter/publication/261537494_Evolving_WAAS_to_serve_L1L5_users/links/5a6a0f5c4585154d15466882/Evolving-WAAS-to-serve-L1-L5-users.pdf Todd Walter, Juan Blanch, R. Eric Phelts, and Per Enge, "Evolving WAAS to Serve L1/L5 Users", Stanford University, 2020]</ref>

	==WAAS Services==		==WAAS Services==

Claudia.Prajanu at 12:42, 30 September 2018

2018-09-30T12:42:53Z

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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~~/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 Services==		==WAAS Services==
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	[[File:Alaska_Airports_with_WAAS_approches.jpg‎ \|Alaska airports with WAAS procedures.\|300px\|thumb\|right]]		[[File:Alaska_Airports_with_WAAS_approches.jpg‎ \|Alaska airports with WAAS procedures.\|300px\|thumb\|right]]

	The objectives of the WAAS are to provide improved [[Integrity\|integrity]], [[Accuracy\|accuracy]], [[Availability\|availability]], and [[Continuity\|continuity]] of service to the [[GPS Services\|GPS Standard Positioning Service]] (SPS) for the Civil Aviation community. The ultimate objective is to provide a navigation system for all phases of flight through precision approach.<ref name=SpecWAAS>[http://www.faa.gov~~/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/documents/media/waas/2892bC2a.pdf~~ ''Specification for the Wide Area Augmentation System(WAAS)''], FAA-E- 2892b, August 13, 2001.</ref>		The objectives of the WAAS are to provide improved [[Integrity\|integrity]], [[Accuracy\|accuracy]], [[Availability\|availability]], and [[Continuity\|continuity]] of service to the [[GPS Services\|GPS Standard Positioning Service]] (SPS) for the Civil Aviation community. The ultimate objective is to provide a navigation system for all phases of flight through precision approach.<ref name=SpecWAAS>[http://www.faa.gov ''Specification for the Wide Area Augmentation System(WAAS)''], FAA-E- 2892b, August 13, 2001.</ref>

	The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/>		The WAAS is a safety-critical system which augments Global Positioning System (GPS) Standard Positioning Service (SPS). The WAAS provides a signal-in-space to WAAS users, i.e. all aircraft with approved WAAS avionics, to support en route through precision approach navigation. The WAAS GEO satellites have ranging capabilities, i.e., they can be used as extra GPS satellites to enhance the performance achieved in the user location because of the additional statistics and the improved geometry. In addition, the WAAS signals broadcast augmentation information that corrects GPS ephemeris and ensures the integrity meeting the [[WAAS Performances\|WAAS performance requirements]].<ref name=SpecWAAS/>

Filipe.Pelica: Included editor logo.

2014-09-18T17:15:56Z

Included editor logo.

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Carlos.Lopez at 11:14, 23 February 2012

2012-02-23T11:14:03Z

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	{{Article Infobox2		{{Article Infobox2
	\|Category=WAAS		\|Category=WAAS
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	\|YearOfPublication=2011		\|YearOfPublication=2011