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APPENDIX
GNSS
Show refresh GNSS position button
Show refresh GNSS position button establishes if the refresh
GNSS position button is available on the guidance screens.
The refresh GNSS position button will reset the ClearPath filter
in the OEMStar receiver in cases where the user has had the
receiver running in close proximity to heavy tree cover and/or
buildings.
NOTE: Activating the refresh while in a job will cause a
momentary interruption in the relay of GNSS data. This
will most likely result in sections already on in automatic
BoomPilot mode to go off for a short period of time.
The refresh should not be done during active application.
Figure 5-10: Refresh GNSS position button
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GNSS glossary
Commercial satellite provider:
Another common source for DGPS signals. Error correction
information obtained from their base stations is sent to a
communications satellite (separate from the GPS satellites) and
broadcast to the user. These satellite-based corrections tend to
have more widespread coverage than tower-based broadcasts
(FM links), and system accuracy is not greatly affected by the
user’s distance from the base station receivers. Most of these
service providers require a subscription fee for use. A commonly
known provider is OmniSTAR.
CORS (continuously operating reference
station)/Network RTK:
A series of base stations spread across a given geographic
region (such as an entire state/county) that are networked via a
centralized computer and which broadcast RTK correction data
over the Internet. CORS networks may be publicly or privately
owned/operated and may offer a free signal or require an annual
subscription fee. By accessing a CORS network via a cellular
connection, the end-user eliminates the need to own a base
station.
Differential corrections
Differential Corrections is a solution specific to the "double-
differencing" algorithm used to determine the correction values
applied by RTK to each GNSS satellites range data. "Corrections"
is the generic term applied to all forms of potential corrections from
SBAS (WAAS/EGNOS) through to OmniStar, TerraStar PPP and
RTK.
Differential GPS (DGPS):
Use of the specific RTK solution to apply differential corrections to
the GPS satellite constellation data.
EGNOS (European geostationary navigation
overlay service):
A satellite based augmentation system (SBAS) developed jointly
by the European space agency (ESA), European community
and EUROCONTROL. The system is free to use and provides
differential correction coverage primarily across the European
continent. EGNOS delivers pass-to-pass accuracies of 15-25 cm
and year-to-year accuracies of +/-1 m.
GLONASS (Global navigation satellite system):
A global satellite navigation system developed and operated by
the Russian government. It is composed of approximately 24
satellites which continuously orbit the earth. While early GNSS
receivers typically utilized only GPS signals, many of today’s
GNSS receivers can utilize signals from both GPS and GLONASS,
effectively increasing the total number of satellites available for
use.