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{{Article Infobox2
{{Article Infobox2
|Category=WAAS
|Category=WAAS
|Authors=GMV
|Editors=GMV
|Level=Basic
|Level=Basic
|YearOfPublication=2011
|YearOfPublication=2011
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|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/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 July 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 Space Segment==
==WAAS Space Segment==
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[[File:WAASGEOCoverage.PNG|Current WAAS GEO Coverage (June 2011)|300px|thumb]]
[[File:WAASGEOCoverage.PNG|Current WAAS GEO Coverage (June 2011)|300px|thumb]]


As of June 2011, the Space segment consists of 3 commercial GEO satellites, [http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2008-039A ''Inmarsat-4 F3''], Telesat's [http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2005-036A ''Anik F1R''], and Intelsat's [http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2005-041A ''Galaxy 15''], which has resumed service in March, 2011.<ref name="WAAS News">[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/news/ FAA WAAS News]</ref>
The WAAS system started with two satellites: Pacific Ocean Region (POR) and Atlantic Ocean Region-West (AOR-W), these satellites ceased WAAS transmissions on July 31, 2007. Before these satellites ceased their transmission, two more satellites, Galaxy15 and AnikF1R, were launched in 2005. After that, a new one added in March 2010, and it started transmitting a test signal whcih wasn't able for navigation but could be received and was reported with the identification number PRN 133 (NMEA#46. In November 2010, this signal was certified and declared available for navigation.:<ref name="WAAS_WIKI">[http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System Wide Area Augmentation System in Wikipedia]</ref>. The GEO satellites which follow this one are currently operating and included in the following table: <ref name="WAAS_GPS_GOV">[https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/waas/ WAAS Space segment information in GPS official web site]</ref>
 
The list of GEO satellites used in WAAS (also in the past) are in the following table:<ref name="WAAS_WIKI">[http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System Wide Area Augmentation System in Wikipedia]</ref>


{| class="wikitable" align="center"
{| class="wikitable" align="center"
|+align="bottom" |''WAAS GEO Satellites (adapted from Wide Area Augmentation System article in Wikipedia)<ref name="WAAS_WIKI"/>''
|+align="bottom" |''WAAS GEO Satellites (adapted from WAAS Space segment information in GPS official website)<ref name="WAAS_GPS_GOV"/>''
! Satellite Name & Details
! Satellite Name & Details
! NMEA / PRN
! NMEA / PRN
! Location
! Location
|-
|-
| '''Inmarsat 4F3 (AMR)'''
| '''Anik F1R (CRE)'''
|NMEA #46 / PRN #133
|98°W
|-
| '''Galaxy 15 (CRW)'''
|NMEA #48 / PRN #135
|133°W
|-
| '''Telesat Anik F1R (CRE)'''
|NMEA #51 / PRN #138
|NMEA #51 / PRN #138
|107.3°W
|107.3°W
|-
|-
| '''Inmarsat 3F3 (POR)''' <br />''Ceased WAAS transmissions''
| '''Eutelsat 117 Wet (GEO5)'''
|NMEA #47 / PRN #134
|NMEA #44 / PRN #131
|178°E
|117°W
|-
| '''SES 15 (GEO6)''' <br />
|NMEA #46 / PRN #133
|129°W
|-
|-
| '''Inmarsat 3F4 (AOR-W)''' <br />''Ceased WAAS transmissions''
|NMEA #35 / PRN #122
|142°W
|}
|}
Three future GEO satellites (GEO 7/8/9] are going to be developed in the future to replace the legacy ones upon lease expiration. The first of them, GEO7(Intelsat) is intended to be operational in 2022. <ref>[https://www.gps.gov/multimedia/presentations/2020/CSNC/auerbach.pdf China Satellite Navigation Conference, November 2020]</ref>


==Notes==
==Notes==

Latest revision as of 07:37, 17 February 2021


WAASWAAS
Title WAAS Space Segment
Edited by GMV
Level Basic
Year of Publication 2011
Logo GMV.png

The Wide Area Augmentation System (WAAS) is the United States Satellite Based Augmentation System. The programme, started in 1992, is being carried out by the Federal Aviation Agency (FAA)[1] and is specially developed for the civil aviation community.[2] The system, which was declared operational in July 2003:,[3] currently supports thousands of aircraft instrument approaches in more than one thousand airports in USA and Canada.[4] WAAS service area includes CONUS, Alaska, Canada and Mexico.[5] 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.[6]

WAAS Space Segment

The WAAS Space Segment is composed by several geosynchronous communication satellites (GEO) in charge of broadcasting, over the WAAS service area, the WAAS augmentation message.

Current WAAS GEO Coverage (June 2011)

The WAAS system started with two satellites: Pacific Ocean Region (POR) and Atlantic Ocean Region-West (AOR-W), these satellites ceased WAAS transmissions on July 31, 2007. Before these satellites ceased their transmission, two more satellites, Galaxy15 and AnikF1R, were launched in 2005. After that, a new one added in March 2010, and it started transmitting a test signal whcih wasn't able for navigation but could be received and was reported with the identification number PRN 133 (NMEA#46. In November 2010, this signal was certified and declared available for navigation.:[7]. The GEO satellites which follow this one are currently operating and included in the following table: [8]

WAAS GEO Satellites (adapted from WAAS Space segment information in GPS official website)[8]
Satellite Name & Details NMEA / PRN Location
Anik F1R (CRE) NMEA #51 / PRN #138 107.3°W
Eutelsat 117 Wet (GEO5) NMEA #44 / PRN #131 117°W
SES 15 (GEO6)
NMEA #46 / PRN #133 129°W

Three future GEO satellites (GEO 7/8/9] are going to be developed in the future to replace the legacy ones upon lease expiration. The first of them, GEO7(Intelsat) is intended to be operational in 2022. [9]

Notes

References

  1. ^ Navigation Services - History - Satellite Navigation, FAA.
  2. ^ Navigation Services - Wide Area Augmentation System (WAAS), FAA.
  3. ^ Wide Area Differential GPS (WADGPS), Stanford University
  4. ^ GNSS - GPS/WAAS Approaches, Federal Aviation Agency (FAA).
  5. ^ WAAS Service Expanded into Canada and Mexico, September 28, 2007, Federal Aviation Agency (FAA).
  6. ^ SatNav News, Vol. 33, March 2008, Federal Aviation Agency (FAA).
  7. ^ Wide Area Augmentation System in Wikipedia
  8. ^ a b WAAS Space segment information in GPS official web site
  9. ^ China Satellite Navigation Conference, November 2020
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