Leica Geosystems GPS Basics - Manual (Page 19)

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GPS Basics -1.0.0en How GPS works
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3.2 Differentially corrected positions (DGPS)
Many of the errors affecting the measure-
ment of satellite range can be com-
pletely eliminated or at least significantly
reduced using differential measurement
techniques.
DGPS allows the civilian user to in-
crease position accuracy from 100m to
2-3m or less, making it more useful for
many civilian applications.
DGPS Reference station broadcasting to Users