7 Troubleshooting intheField
7.7 Troubleshooting GNSS systems
To quickly assess the GNSS components of a system, do the following:
l Use the information in 7.3 Running system diagnostics, particularly 7.3.2
GNSS diagnostics and satellite monitoring, to check the following:
Are the GNSS receivers connected?
Do the GNSS receivers have the correct software version loaded?
Are they reporting an RTK (Fixed) position status?
Is the data link operating effectively?
The left data link should be operating with less than 0.3seconds latency
and an integrity of about 90%.
The right data link should be operating with less than 0.3seconds latency
and an integrity of about 100%.
l Use the information in 7.6.2 GNSS receiver status indicators to check the
following:
Is the GNSS receiver getting power?
Is the GNSS receiver tracking four or more satellites?
Is the left GNSS receiver, or the receiver in a single receiver system,
processing 1Hz Compact Measurement Records™ (CMR) data?
Is the right GNSS receiver processing 10Hz CMR data?
ll Is the data radio getting power and is the data radio synchronized? To check,
use the information in:
7.6.3 SNRxxx radio modem status indicator.
7.6.4 SNM940 cellular radio status indicators.
l Observe the site and work area, and check the following:
Do you have an unobstructed view of the sky to within about 10° of the
horizon across the entire work area? If some, or all, of your work area has
a limited view of the sky, ask your site supervisor what is the best time for
you to work.
Are you working near any large reflective surfaces that could cause the
GNSS signal to “ghost” (multipathing)?
l Ask your site supervisor to check the operation of the GNSS base station. Are
the GNSS receiver and base data radio operating correctly? Observe the base
station area, and check the following:
184 GCS900 GradeControl System for Excavators Operator's Manual
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