C-Nav 2050M User Manual - page 153
C-Nav2050 User Guide
satellite tracking information. It is used in post-
processing of collected GPS data.
Precision is the degree of agreement or repeatabilit
among a series of individual measurements, value
results. The precision o
y
s, or
f a numerical value can refer to
a
orms
e
tem
its a
, calculated by
(radio waves travel at the
es
the number of significant digits used to express
quantity or that an instrument can measure to. Precision
is related to the quality of the operation through which
the result is obtained.
PRN (Uppercase) typically indicates a GPS satellite
number sequence from 1 – 32.
Projection is a mathematical formula that transf
feature locations between the earth’s curved surfac
and a map’s flat surface. A projected coordinate sys
includes the information needed to transform locations
expressed as latitude values to x,y coordinates.
Projections cause distortion in one or more of these
spatial properties-distance, area, shape and direction.
Protected codesee P-code.
Pseudo-Random Noise (prn) is a sequence of data
that appears to be randomly distributed but can be
exactly reproduced. Each GPS satellite transm
unique PRN in its signals. GPS receivers use PRNs to
identify and lock onto satellites and to compute their
pseudoranges.
Pseudorange is the apparent distance from the
reference station’s antenna to a satellite
multiplying the time the signal takes to reach the
antenna by the speed of light
speed of light). The actual distance, or range, is not
exactly the same because various factors cause errors
in the measurement.
Radio Technical Commission for Maritime Servic
(RTCM) is a standard format for Differential GPS
G-21