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8 Real-Time Kinematic (RTK) Surveying
100 5700 GPS Receiver User Guide
Applications
8.4 WAAS
The 5700 receiver can use the WAAS (Wide Area Augmentation
System) set up by the Federal Aviation Administration (FAA). WAAS
was established for flight and approach navigation for civil aviation.
WAAS improves the accuracy, integrity, and availability of the basic
GPS signals over its coverage area, which includes the continental
United States and outlying parts of Canada and Mexico.
WAAS can be used in surveying applications to improve single point
positioning when starting a reference station, or when the RTK radio
link is down. WAAS corrections should be used to obtain greater
accuracy than autonomous positioning, not as an alternative to RTK
positioning.
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 5700 receiver,
exactly like a GPS satellite. For more information on WAAS, refer to
the FAA home page at http://gps.faa.gov.
Use the Trimble Survey Controller software or the GPS Configurator
software to enable WAAS support in the 5700 receiver. For more
information, refer to the Trimble Survey Controller Reference Manual
or the GPS Configurator Help.
At the time this manual went to print, the WAAS system was
operational, but had not been enabled by the FAA for general use. To
use WAAS corrections while the system is disabled, configure the
5700 receiver to ignore WAAS health messages. To do this, in the
General tab of the GPS Configurator software, select the Ignore WAAS
correction health check box.