NAVIOR-24S
™
Appendix G
Glossary
222
NAVIOR-24S ™
Revision
V1.00 20.05.2008
default setting
A preset or initial value that is assumed to be the preferred or
appropriate selection for most situations. The NAVIOR-24S
GPS/GLONASS receiver is shipped with factory default configuration
settings; the settings were determined by Lab NAVIS.
DGNSS reference station A device that tracks all GPS/GLONASS satellites in view, periodically
performs inter-channel calibrations, and calculates and transmits
differential corrections.
Differential capable
A term used to describe a GPS/GLONASS receiver that is capable of
receiving and applying differential GPS/GLONASS corrections
DGNSS
A procedure of correcting GPS/GLONASS solutions to achieve
improved position accuracy. Differential GPS/GLONASS provides to 5
meter position accuracy. Differential accuracy is obtained by applying
corrections determined by the stationary Differential GPS/GLONASS
Reference Station to the GPS/GLONASS data collected by the RPU
unit on-board the vehicle
Differential processing
GPS/GLONASS measurements can be differenced between receivers,
satellites, and epochs. Although many combinations are possible, the
present convention for differential processing of GPS/GLONASS phase
measurements is to take differences between receivers (single
difference), then between satellites (double difference), then between
measurement epochs (triple difference).
Differential relative
positioning
Determination of relative coordinates of two or more receivers which
are simultaneously tracking the same satellites. Static differential GPS
involves determining baseline vectors between pairs of receivers. Also
see differential GPS/GLONASS
dilution of precision
A description of the purely geometrical contribution to the uncertainty
in a position fix, given by the expression DOP = SQRT TRACE (AA)
where AA is the design matrix for the instantaneous position solution
(dependent on satellite receiver geometry). The DOP factor depends on
the parameters of the position-fix solution. Standard terms for the GPS
application are:
GDOP: Geometric (three position coordinates plus clock offset in the
solution)
PDOP: Position (three coordinates)
HDOP: Horizontal (two horizontal coordinates)
VDOP: Vertical (height only) TDOP: Time (clock offset only)
DOP
See dilution of precision.
Doppler aiding
The use of Doppler carrier-phase measurements to smooth code-phase
