NavCom SF-3050 Rev.I - Manual (Page 193)

SF-3050 GNSS Product User Guide – Rev I
G-174
provides compensation for ionospheric effects. In addition, reception of multiple signals
provides redundancy that results in a more stable navigation solution during adverse
conditions.
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.
OEM (Original Equipment Manufacturer) is typically a company that uses a component
made by a second company in its own product, or sells the product of the second
company under its own brand. The specific meaning of the term varies in different
contexts.
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 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.
Positronic a type of data or power connector.
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