NavCom SF-3040 Rev.F - Manual (Page 213)

SF-3040 Product User Guide
– Rev. F
Glossary-211
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 PRNs 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 Sapphire GNSS proprietary message
format.
Quick Start (StarFi
re™) a startup mode that
allowsinstant <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