John Deere STARFIRE RTK OMPFP11348 - Manual (Page 17)

900 MHz RTK—Base Station Setup
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PDOP Definition
PC9548
—UN—06NOV06
A—Horizontal Precision (m) B—Maximum PDOP Value
The Position Dilution of Precision (PDOP) is likely one
of the most critical GPS AutoTrac values to monitor.
As the PDOP value increases, both the horizontal and
vertical precision (guidance accuracy) of your data points
decreases.
To help illustrate this relationship, please review the
graph, which plots the PDOP value against the horizontal
precision points collected on and around the University of
Montana campus. Ten locations were collected to serve
as ground control points to register an April 4, 1999 aerial
photograph of the University area. You can see that
as the PDOP value climbs from a minimum of 1.15 to a
maximum of approximately 4.5, the horizontal precision
and accuracy decreases from about 1.15 meters to about
1.9 meters. PDOP values below 7 are generally required
to collect data at a 1 meter accuracy range (as determined
by the PDOP mask set on your data logger) and any value
below 3.5 is considered in-range for AutoTrac applications.
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