NavCom NCT-2030M Rev.C - Manual (Page 53)

NCT-2030M User Guide - Rev. C
PDOP mask the highest PDOP value at which a receiver
computes positions.
phase center the point in an antenna where the
GPS
signal from the satellites is received. The height above
ground of the
phase center must be measured
accurately to ensure accurate GPS readings. The phase
center height can be calculated by adding the height to
an easily measured point, such as the base 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 .
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