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2 Overview
10 AgGPS 332 GPS Receiver User Guide
A transmitter in the base station sends the corrections through a radio
link to the rover radio, which sends the corrections to the AgGPS 332
receiver. The rover receiver uses RTK corrections from the base station
to calculate its position to centimeter-level accuracy. As part of this
process, the rover receiver must calculate an initialization. This takes a
few seconds. While the receiver is initializing, an RTK Float solution is
generated. Once initialized, an RTK Fixed solution is generated. It is the
RTK Fixed solution that provides centimeter-level accuracy.
The parts per million (ppm) error is dependent on the distance
(baseline length) between the base and rover receiver. For example, if
the distance is 10 km, a 2 ppm error equals 20 mm.
For more information about RTK positioning, go to the Trimble website
at www.trimble.com/gps/.
24.2 Differential GPS positioning (DGPS)
For differential positioning, the AgGPS 332 receiver uses corrections
from SBAS (WAAS/EGNOS)/OmniSTAR satellites and Radio Beacons.
These differential systems use special algorithms to provide differential
corrections that allow the rover receiver to calculate its position more
accurately.
Free corrections
WAAS/EGNOS corrections are free in North America and Europe.
For more information about WAAS, go to the Federal Aviation
Administration website at
http://gps.faa.gov/Programs/WAAS/waas.htm.
For more information about EGNOS, go to the European Space Agency
website at
www.esa.int/export/esaSA/GGG63950NDC_navigation_0.html.
Radio Beacon corrections are available free worldwide. For more
information about the Coast Guard Beacon, go to
www.navcen.uscg.gov/Default.htm.