NavCom RT-3020 Rev.A - Manual (Page 51)

RT-3020 User Guide
Glossary-49
multipath error a positioning error resulting from
interference between radio waves that has traveled
between the transmitter and the receiver by two paths
of different electrical lengths.
navigation (.YYn) files one of the three file types that
make up the
RINEX file format. Where YY indicates the
last two digits of the year the data was collected. A
navigation file contains satellite
position and time
information.
observation (.YYo) files one of the three file types that
make up the
RINEX file format. Where YY indicates the
last two digits of the year the data was 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.
parity a method of detecting communication errors by
adding an extra parity bit to a group of bits. The parity
bit can be a 0 or 1 value so that every byte will add up
to an odd or even number (depending on whether odd
or even parity is chosen).
PDA Personal Digital Assistant
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 from the satellites is received. The height above
ground of the
phase center must be measured