NavCom LAND-PAK Rev.N - Manual (Page 192)

Technical Reference Manual Rev. N
- Glossary 190
format.
Quick Start (StarFire™) a startup mode that allows instant <decimeter accuracy with received
StarFire™ signals, allowing the convergence period to be waived. The Quick Start (user input)
position should have an accuracy of better <decimeter to achieve maximum results. Any error in
the user input position will bias the StarFire™ position error accordingly, until convergence can
correct the bias. In this scenario, convergence may take longer than the typical startup
convergence period.
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 GPS system that yields very accurate 3D position fixes
immediately in real-time. The base station transmits its GPS 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 dual frequency GPS receivers and high speed radio modems.
reference station a reference station collects GPS data for a fixed, known location. Some of
the errors in the GPS 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 GPS data collected by roving receivers.
RHCP Right Hand Circular Polarization used to discriminate satellite signals. GPS signals
are RHCP.
RINEX (Receiver Independent Exchange) is a file set of standard definitions and formats
designed to be receiver or software manufacturer independent and to promote the free
exchange of GPS data. The RINEX file format consists of separate files, the three most
commonly used are:
the observation (.YYo) file,
the navigation (.YYn) file,
meteorological (.YYm) files; where YY indicates the last two digits of the year the data was
collected.
rover any mobile GPS receiver and field computer collecting data in the field. A roving
receiver’s position can be differentially corrected relative to a stationary reference GPS receiver
or by using GPS orbit and clock corrections from a SBAS such as StarFire .
roving receiver see rover.
RTCM (Radio Technical Commission for Maritime Services) a standard format for Differential
GPS corrections used to transmit corrections from a base station to rovers. RTCM allows both
real-time kinematic (RTK) data collection and post-processed differential data collection. RTCM
SC-104 (RTCM Special Committee 104) is the most commonly used version of RTCM
message.
RTK see Real-time kinematic.