NavCom SF-3050 Rev.A - Manual (Page 165)

SF-3050 User Guide – Rev A
Glossary-163
Radio Technical Commission for Maritime
Services see RTCM.
range the distance between a satellite and a GPS
imately equal
n be
h slow
n
now the
nt
he correct distance from each of
tion fixes immediately in
he base station
sitions for this location can be applied to
receiver’s antenna. The range is approx
to the pseudorange. However, errors ca
introduced by atmospheric conditions whic
down the radio waves, clock errors, irregularities i
the satellite’s orbit, and other factors. A GPS
receiver’s location can be determined if you k
ranges from the receiver to at least four GPS
satellites. Geometrically, there can only be one poi
in space, which is t
four known points.
RCP a NavCom Technology, Inc. proprietary
processing technique in which carrier phase
measurements, free of Ionospheric and Troposphere
effects are used for navigation.
Real-Time Kinematic (RTK) a GNSS system that
yields very accurate 3D posi
real-time. The base station transmits its GNSS
position to roving receivers as the receiver generates
them, and the roving receivers use t
readings to differentially correct their own positions.
Accuracies of a few centimeters in all three
dimensions are possible. RTK requires
multi-frequency GNSS receivers and high speed
radio modems.
reference station a reference station collects GNSS
data for a fixed, known location. Some of the errors in
the GNSS po
positions recorded at the same time by roving
receivers which are relatively close to the reference
station. A reference station is used to improve the
quality and accuracy of GNSS data collected by
roving receivers.