NavCom SF-3050 Rev.B - Manual (Page 195)

SF-3050 User Guide – Rev B
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
collected the data and returned to the office, rather
than in real time as you log the data, so it can use
complex, calculations to achieve greater accuracy.
Glossary-193