NavCom RT-3020 Rev.A - Manual (Page 53)

RT-3020 User Guide
Glossary-51
pseudo-random noise ( prn ) a sequence of data that
appears to be randomly distributed but can be exactly
reproduced. Each
GPS satellite transmits a unique PRN
in its signals. GPS receivers use PRN s to identify and
lock onto satellites and to compute their pseudoranges.
Pseudorange the apparent distance from the
reference
station ’s antenna to a satellite, calculated by multiplying
the time the signal takes to reach the antenna by the
speed of light (radio waves travel at the speed of light).
The actual distance, or
range , is not exactly the same
because various factors cause errors in the
measurement.
PVT
GPS information depicting Position, Velocity, Time
in the NCT proprietary message format.
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