NavCom SF-3050 Rev.I - Manual (Page 194)

SF-3050 GNSS Product User Guide – Rev I
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collected the data and returned to the office, rather than in real time as you log the data,
so it can use complex, calculations to achieve greater accuracy.
Precise code see P-code.
PRN (Uppercase) typically indicates a GPS satellite number sequence from 1 – 32.
prn (Lower Case) see Pseudorandom Noise.
Protected code see P-code.
Proprietary commands those messages sent to and received from GPS equipment
produced by NavCom Technology, Inc. own copyrighted binary language.
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 GNSS information depicting Position, Velocity, Time in the NCT proprietary
message 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.
QZSS Quasi Zenith Satellite System.
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 sat
ellite’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.