NavCom SF-2040 Rev.F - Manual (Page 90)

SF-2040 User Guide – Rev. F
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.
Glossary-88