Differential gps positioning (dgps), Free corrections – Ag Leader GPS 5100 User Guide User Manual
Page 17
GPS 5100 Receiver User Guide 1 1
Overview 2
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
26.2
Differential GPS positioning (DGPS)
For differential positioning, the GPS 5100 receiver uses corrections
from WAAS/EGNOS satellites or from OmniSTAR VBS or HP
satellites.
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
For more information about EGNOS, go to the European Space
Agency website at