C-Nav 2050M User Manual - page 151
C-Nav2050 User Guide
Navigation (.YYn) files one of the three file types that
make up the RINEX file format. Where YY indicates
last two digits of the year the data was collected. A
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navigation file contains satellite position and time
information.
Navigation Message is the 1500-bit message
broadcast by each satellite at 50bps on both L1 and L2
beacons. This message contains syste
correction parameters, ionospheric delay model
parameters, and the vehicle’s ephemeris and health.
This information is used to process the GPS s
obtain user position and velocity.
NAVSTAR is the name given to GPS satellites,
originally manufactured by Rockwell International.
Observation (.YYo) files one of the three f
make up the RINEX file format. Where YY indica
last two digits of the year the data was collected. An
observation file contains raw GPS position information.
P-code is the extremely long pseudo-random co
generated by a GPS satellite. It is intended for us
by the U.S. military, so it can be encrypted to Y-code
and then denies unauthorized users access.
Parity is 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 (depend
whether odd or even parity is chosen).
PDOP Mask is the highest PDOP value at which a
receiver computes positions.
Perigee is the point in the orbit of a satellite about the
earth that is the least distant from the center of th
earth.
Phase Center is the point in an antenna where the
GPS signal from the satellites is received. The height
G-19