Leica Geosystems Leica mojo3D - User Manual - Manual (Page 376)

376 Leica mojo3D, Glossary of Terms
tude is 0° at Greenwich and is measured either east-
ward through 360° or eastward 180° and westward
180°.
NMEA
National Marine Electronics Association.
NMEA 0183
NMEA 0183 is a combined electrical and data specifi-
cation for communication between marine electronic
devices such as echo sounder, sonars, anemometer
(wind speed and direction), gyrocompass, autopilot,
GPS receivers and many other types of instruments.
NTrip
Networked Transport of RTCM via Internet Protocol.
Post processing
The process of computing positions in non-real-time,
using data previously collected by GPS receivers.
RMS
Root Mean Squared, the root mean square is known
as the quadratic mean and is a statistical measure of
the magnitude of a varying quantity.
RTCM
Radio Technical Commission for Maritime Services.
RTCM3 is an RTK correction protocol.
RTK
Real Time Kinematic. A term used to describe the
procedure of resolving the phase ambiguity at the
GPS receiver, so that the need for post-processing is
removed.
SBAS
Satellite Based Augmentation System. SBAS
comprises a number of ground stations at surveyed
points. The ground stations take measurements of
GPS satellites, their signals, and environmental
factors that may affect the signals received by users,
and create adjustment messages to send to one or
more satellites for broadcast to users.