NavCom SF-2040 Rev.F - Manual (Page 88)

SF-2040 User Guide – Rev. F
of the antenna mount, to the known distance between
this point and the phase center.
Position the latitude, longitude, and altitude of a
point. An estimate of error is often associated with a
position.
Position Dilution of Precision (PDOP) a measure of
the magnitude of Dilution of Position (DOP) errors in
the x, y, and z coordinates.
Post-processing a method of differential data
correction, which compares data logged from a
known reference point to data logged by a roving
receiver over the same period of time. Variations in
the position reported by the reference station can be
used to correct the positions logged by the roving
receiver. Post-processing is performed after you have
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
Glossary-86