WAAS
Wide Area Augmentation System. WAAS was established by the Federal
Aviation Administration (FAA) for flight and approach navigation for civil aviation.
WAAS improves the accuracy and availability of the basic GNSS signals over its
coverage area, which includes the continental United States and outlying parts
of Canada and Mexico.
The WAAS system provides correction data for visible satellites. Corrections are
computed from ground station observations and then uploaded to two
geostationary satellites. This data is then broadcast on the L1 frequency, and is
tracked using a channel on the GNSS receiver, exactly like a GNSS satellite.
Use WAAS when other correction sources are unavailable, to obtain greater
accuracy than autonomous positions. For more information on WAAS, refer to
the FAA website at http://gps.faa.gov.
The EGNOS service is the European equivalent and MSAS is the Japanese
equivalent of WAAS.
WGS-84
World Geodetic System 1984. Since January 1987, WGS-84 has superseded
WGS-72 as the datum used by GPS.
The WGS-84 datum is based on the ellipsoid of the same name.
SPS985 GNSS Smart Antenna Getting Started Guide 36
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General