NTripSource
The NTripSources provide continuous GNSS data (for example, RTCM-104
corrections) as streaming data. A single source represents GNSS data referring
to a specific location. Source description parameters are compiled in the
source-table.
OmniSTAR
The OmniSTAR HP/XP service allows the use of new generation dual-frequency
receivers with the OmniSTAR service. The HP/XP service does not rely on local
reference stations for its signal, but utilizes a global satellite monitoring network.
Additionally, while most current dual-frequency GNSS systems are accurate to
within a meter or so, OmniSTAR with XP is accurate in 3D to better than 30 cm.
Orthometric elevation
The Orthometric Elevation is the height above the geoid (often termed the
height above the 'Mean Sea Level').
PDOP
Position Dilution of Precision. PDOP is a DOP value that indicates the precision of
three-dimensional measurements. Other DOP values include VDOP (vertical
DOP) and HDOP (Horizontal Dilution of Precision).
Using a maximum PDOP value is ideal for situations where both vertical and
horizontal precision are important.
postprocessing
Postprocessing is the processing of satellite data after it is collected, in order to
eliminate error. This involves using computer software to compare data from
the rover with data collected at the base station.
QZSS
Quasi-Zenith Satellite System. A Japanese regional GNSS eventually consisting of
three geosynchronous satellites over Japan.
real-time differential
GPS
Also known as real-time differential correction or DGPS. Real-time differential
GPS is the process of correcting GPS data as you collect it. Corrections are
calculated at a base station and then sent to the receiver through a radio link. As
the rover receives the position it applies the corrections to give you a very
accurate position in the field.
Most real-time differential correction methods apply corrections to code phase
positions.
While DGPS is a generic term, its common interpretation is that it entails the use
of single-frequency code phase data sent from a GNSS base station to a rover
GNSS receiver to provide sub-meter position. The rover receiver can be at a
long range (greater than 100 kms (62 miles)) from the base station.
rover
A rover is any mobile GNSS receiver that is used to collect or update data in the
field, typically at an unknown location.
Roving mode
Roving mode applies to the use of a rover receiver to collect data, stakeout, or
control earthmoving machinery in real time using RTK techniques.
RTCM
Radio Technical Commission for Maritime Services. A commission established to
define a differential data link for the real-time differential correction of roving
GNSS receivers. There are three versions of RTCM correction messages. All
SPS985 GNSS Smart Antenna Getting Started Guide 34
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General