USER’S GUIDE SF-2110, Руководство пользователя

Страница: 89 / 95

SF-2110 User Guide – Rev. A
collected. An observation file contains raw GPS
position information.
P/N Part Number.
P-code the extremely long pseudo-random code
generated by a GPS satellite. It is intended for use
only by the U.S. military, so it can be encrypted to Y-
code deny unauthorized users access.
g communication errors by
rity
up
her
rsonal Digital Assistant.
from the satellites is received. The height
ngitude, and altitude of a
ith a
al data
om a
n
parity a method of detectin
adding an extra parity bit to a group of bits. The pa
bit can be a 0 or 1 value so that every byte will add
to an odd or even number (depending on whet
odd or even parity is chosen).
PDA Pe
PDOP see Position Dilution of Precision .
PDOP mask the highest PDOP value at which a
receiver computes positions.
phase center the point in an antenna where the
GPS signal
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, lo
point. An estimate of error is often associated w
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 differenti
correction, which compares data logged fr
known reference point to data logged by a roving
receiver over the same period of time. Variations i
Glossary-87