Sokkia RADIAN IS, Operation Manual, Page: 61 / 74

RADIAN™IS 55
Glossary
Antenna - The antenna is the component of a GPS system that
collects the analog signal from the GPS satellite and sends this
signal to the GPS receiver for processing.
Baseline - The three-dimensional vector distance between a pair
of stations for which simultaneous GPS data has been collected
and processed with differential techniques. The most accurate
GPS result.
Base Station - In differential positioning, a base station is the
end of the baseline that is assumed known and its position fixed.
The GPS receiver, which is acting as the stationary reference, is
referred to as the base receiver, and it has a known position and
transmits messages for the rover receiver to use to calculate its
position.
Carrier Phase - The phase of either the L1 or L2 carrier of a GPS
signal, measured by a receiver while locked-onto the signal (also
known as integrated Doppler).
CMR - Compact Measurement Record, a standard
communications protocol format used in Real-Time kinematic
systems to transfer GPS carrier phase and code observations
from a base station to one or more rover stations.
Coarse Acquisition (C/A) Code - The Course/Acquisition (or
Clear/Acquisition) code modulated onto the GPS L1 signal.
Datum - See Geodetic datum
Differential GPS (DGPS) - a technique to improve GPS
accuracy that uses pseudorange errors at a known location to
improve the measurements made by other GPS receivers within
the same general geographic area.
Dilution of Precision (DOP) - The geometry of the visible
satellites is an important factor in achieving high quality results.
The geometry changes with time due to the relative motion of
the satellites. An accuracy measure for the geometry is the