NavCom SF-3050 Rev.B - Manual (Page 197)

SF-3050 User Guide – Rev B
Radio Technical Commission for Maritime
Services see RTCM.
range the distance between a satellite and a GPS
receiver’s antenna. The range is approximately equal
to the pseudorange. However, errors can be
introduced by atmospheric conditions which slow
down the radio waves, clock errors, irregularities in
the satellite’s orbit, and other factors. A GPS
receiver’s location can be determined if you know the
ranges from the receiver to at least four GPS
satellites. Geometrically, there can only be one point
in space, which is the correct distance from each of
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 position fixes immediately in
real-time. The base station transmits its GNSS
position to roving receivers as the receiver generates
them, and the roving receivers use the base station
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 positions for this location can be applied to
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.
Glossary-195