NavCom RT-3020 Rev.A - Manual (Page 47)

RT-3020 User Guide
Glossary-45
applying these corrections to the satellite data received
by the
rover .
Dilution of Precision (
DOP ) a class of measures of the
magnitude of error in GPS position fixes due to the
orientation of the GPS satellites with respect to the GPS
receiver. There are several DOP s to measure different
components of the error. Note: this is a unit less value.
see also
PDOP .
DOP see
Dilution of Precision .
dual-frequency a type of
GPS receiver that uses both
L1 and L2 signals from GPS satellites. A dual-frequency
receiver can compute more precise position fixes over
longer distances and under more adverse conditions
because it compensates for ionospheric delays. The SF-
2050 is a dual frequency receiver.
dynamic mode when a
GPS receiver operates in
dynamic mode , it assumes that it is in motion and
certain algorithms for GPS position fixing are enabled in
order to calculate a tighter position fix.
EGNOS (European Geostationary Navigation Overlay
Service) a European satellite system used to augment
the two military satellite navigation systems now
operating, the US
GPS and Russian GLONASS systems.
elevation distance above or below Local Vertical
Datum.
elevation mask the lowest
elevation , in degrees, at
which a receiver can track a satellite. Measured from
the horizon to zenith, 0º to 90º.
ellipsoid a mathematical figure approximating the
earth’s surface, generated by rotating an ellipse on its