TeeJet Technologies AEROS 9040, Руководство пользователя

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98-05304-EN R2
Aeros 9040 field computer
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APPENDIX
GNSS
PRN not shown
PRN options are only available with SBAS GNSS type selected.
Figure 5-9: PRN not shown
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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Mark A
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.