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Glossary
Leica GS20 Field Guide-1.1.0en
97
Longitude
Longitude is the angle between the meridian ellipse which
passes through Greenwich and the meridian ellipse
containing the point in question.
Mask Angle
The minimum elevation angle below which no more GPS
satellites are tracked by the receiver.
Max Accuracy (ClearTrack)
The tracking mode incorporating carrier phase smoothing
with the highest discriminating tracking algorithms.
Max Track
Leica’s Trademark tracking technology created for dense
foliage and other inhospitable environments.
Maximum Age of Correction
The amount of time a real-time correction will be used to
adjust a GPS position, once the correction link is lost.
Meridian
An imaginary line joining north to south pole and passing
through the equater at 90
o
.
Multipath Error
A positioning error resulting from interference between
split radio waves which have travelled to the receiver from
differing paths.
NMEA
National Marine Electronics Association. A standered
originally defined to enable marine electronics
instruments, communication, and navigation equipment to
communicate.
Orthometric Height
The distance of a point above the geoid (or mean sea
level). Ortho = Elipsoid - Geoid.
PDOP
Positional dilution of precision. See DOP
Post-processing
The process of computing positions in non-real-time,
using data previously collected by GPS receivers. See
differential corrections.
Pseudo-range
A measure of the apparent signal propagation time from
the satellite to the receiver antenna, scaled into distance
by the speed of light. Pseudorange differs from the actual
range by the inlfuence of satellite and user clock.
Quality
A measure of precision calculated by residuals calculated
using a 2D sigma (67% confidence)
Real-Time
A DGPS position calculated by correcting autonomous
GPS with a differential correction.