Leica Geosystems GPS Basics - Manual (Page 56)

56
GPS Basics -1.0.0en Glossary
Rapid static survey
Term used in connection with the GPS
System for static survey with short
observation times. This type of survey is
made possible by the fast ambiguity
approach that is resident in the SKI
software.
Raw data
Original GPS data taken and recorded
by a receiver.
Receiver channel
The radio frequency and digital hard-
ware and the software in a GPS receiver,
required to track the signal from one
GPS satellite at one of the two GPS
carrier frequencies.
Reconstructed carrier phase
The difference between the phase of the
incoming Doppler-shifted GPS carrier
and the phase of a nominally-constant
reference frequency generated in the
receiver.
Relative positioning
See Differential positioning
Rhumb line
Term used in navigation. Trajectory
between two points with constant
bearing.
RINEX
Receiver INdependent EXchange format.
A set of standard definitions and formats
to promote the free exchange of GPS
data
RTCM
Radio Technical Commission for
Maritime services. Commission set up
to define a differential data link to relay
GPS messages from a monitor station
to a field user.
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.
Satellite Constellation
The arrangement in space of the
complete set of satellites of a system
like GPS.
Satellite Configuration
The state of the satellite constellation at
a specific time, relative to a specific user
or set of users.
Selective availability (SA)
Degradation of point positioning accu-
racy for civil users by the U.S. Depart-
ment of Defense. SA is produced by
either clock dithering or orbit degrada-
tion.