System that enhances the accuracy of GPS receivers
"WAAS" redirects here. For other uses of the acronym "WAAS", see WAAS (disambiguation).
Wide Area Augmentation System (WAAS)
Country/ies of origin
United States
Operator(s)
FAA
Status
Operational
Coverage
United States, Canada, Mexico
Accuracy
1.0 metre (3.3 ft)[1]
Constellation size
Current usable satellites
3
First launch
2003; 21 years ago (2003)
Orbital characteristics
Regime(s)
GEO (uses communication satellites)
Geodesy
Fundamentals
Geodesy
Geodynamics
Geomatics
History
Concepts
Geographical distance
Geoid
Figure of the Earth (radius and circumference)
Geodetic coordinates
Geodetic datum
Geodesic
Horizontal position representation
Latitude / Longitude
Map projection
Reference ellipsoid
Satellite geodesy
Spatial reference system
Spatial relations
Vertical positions
Technologies
Global Nav. Sat. Systems (GNSSs)
Global Pos. System (GPS)
GLONASS (Russia)
BeiDou (BDS) (China)
Galileo (Europe)
NAVIC (India)
Quasi-Zenith Sat. Sys. (QZSS) (Japan)
Discrete Global Grid and Geocoding
Standards (history)
NGVD 29
Sea Level Datum 1929
OSGB36
Ordnance Survey Great Britain 1936
SK-42
Systema Koordinat 1942 goda
ED50
European Datum 1950
SAD69
South American Datum 1969
GRS 80
Geodetic Reference System 1980
ISO 6709
Geographic point coord. 1983
NAD 83
North American Datum 1983
WGS 84
World Geodetic System 1984
NAVD 88
N. American Vertical Datum 1988
ETRS89
European Terrestrial Ref. Sys. 1989
GCJ-02
Chinese obfuscated datum 2002
Geo URI
Internet link to a point 2010
International Terrestrial Reference System
Spatial Reference System Identifier (SRID)
Universal Transverse Mercator (UTM)
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WAAS system overview
The Wide Area Augmentation System (WAAS) is an air navigation aid developed by the Federal Aviation Administration to augment the Global Positioning System (GPS), with the goal of improving its accuracy, integrity, and availability. Essentially, WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including precision approaches to any airport within its coverage area.[2] It may be further enhanced with the Local Area Augmentation System (LAAS) also known by the preferred ICAO term Ground-Based Augmentation System (GBAS) in critical areas.
WAAS uses a network of ground-based reference stations, in North America and Hawaii, to measure small variations in the GPS satellites' signals in the western hemisphere. Measurements from the reference stations are routed to master stations, which queue the received Deviation Correction (DC) and send the correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy.
The International Civil Aviation Organization (ICAO) calls this type of system a satellite-based augmentation system (SBAS). Europe and Asia are developing their own SBASs, the Indian GPS Aided Geo Augmented Navigation (GAGAN), the European Geostationary Navigation Overlay Service (EGNOS), the Japanese Multi-functional Satellite Augmentation System (MSAS) and the Russian System for Differential Corrections and Monitoring (SDCM), respectively. Commercial systems include StarFire, OmniSTAR, and Atlas.
^Cite error: The named reference WAAS_NSTB_PAN_Report_Jul06 was invoked but never defined (see the help page).
^Federal Aviation Administration (FAA) FAQ for WAAS
and 21 Related for: Wide Area Augmentation System information
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transmitted via satellite in Satellite Based AugmentationSystems (SBAS) such as WideAreaAugmentationSystem (WAAS) (available in North America and Hawaii)...
aesthetic enhancement (by augmentation or by reduction) of the contour of the buttocks. The corrective procedures for buttock augmentation and buttock repair...
63 which includes WideAreaAugmentationSystem support. The GDC computer replaces the internal components of the pitot-static system in traditional aircraft...
when used with land-based assisting technologies such as the WideAreaAugmentationSystem (WAAS). Waypoints can also be marked on a computer mapping program...
less. Past and current navigation systems that use geostationary satellites include: The WideAreaAugmentationSystem (WAAS), operated by the United States...
(that is, differential GPS (DGPS)) or via satellites (that is, WideAreaAugmentationSystem (WAAS)) can bring accuracy to a few metres or < 1 metre, or...
Global Information
