Hexagon VERIPOS LD900, Инструкция по установке и эксплуатации

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Troubleshooting
LD900 Installation and Oper ations M anual 58
5.4 L-band Signal Issues
5.5 GNSS Signal Issues
Fault Description Possible Cause Solution
Red Corrections
indicator
Selected L-band beam unavailable in the
work location.
Ref er to the L-band Coverage Map to
check that selected beam is appropriate for
work region, amending if required.
Setting L-band to
Auto will mitigate against
the need to do this.
Where L-band signal
is derived from the
vessel’s Inmarsat system check that the
LD900 is set to the same satellite, referring
to the latest VERIPOS
beam frequency
table if necessary.
Antenna blockage (masking).
Visually check if the path between the
antenna and the L-band satellite is
blocked. This can be caused by other
vessels, rigs, structures or the vessels own
superstructure.
Incorrect L-band source.
Check the LD900 Source Antenna
selection, which defines which RF port
should be used for connecting the L-band
input. Change if necessary.
L-band antenna voltage turned off.
Check Receiver > Antenna to ensure that
voltage is switched on for the L-band
Source Antenna.
Interf erence.
Sources of interference within the vessels
control (such as onboard sources of L-
band or high-power transmissions) should
be identified and eliminated.
Antenna disconnected or faulty.
Check antenna and cabling for DC power
as well as signs of damage.
Fault Description Possible Cause Solution
Red Positioning
indicator
Antenna blockage (masking).
Visually check whether the path between
the antenna and the GNSS satellites is
blocked. This can be caused by other
vessels, rigs, structures or the vessels own
superstructure.
Interf erence
Sources of interference within the vessels
control should be identified and eliminated.
Investigations should focus on sources of
signal transmissions around the same