Doc. P/N:
WSP-009-004
Version:
V1.3
Issue Date:
August 2013
Page 54 of 62
Operator Manual
7.5
Why is there a ring displayed just above the sea
fl
oor? What causes
these ‘ring’ marks? How can I get rid of them?
This ring is a by-product of the multibeam technology of your WASSP system. It is supposed to
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feature allows these rings to be suppressed
on the Sonar display. Care should be taken
because hiding these rings will also make it
hard to see any signals below them such as
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When a signal arrives at the receiver it
creates a shadow like effect that creates a
ring of much weaker echoes, the stronger the
signal the stronger the rings. Unfortunately
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echo and thus the shadow of weaker echoes
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How do I know if I have a problem then?
When running with Auto Power By Signal (BLUE) and the power level is above 1 then the
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below the ring but the more chance of the rings being visible on the Sonar display. If you are
required to use a higher power level then it may well be impossible to hide them completely with
Minimisation.
If you have the system working with no sign of these rings and then they start to appear and you
have not changed the Minimisation settings then something has changed for the worse – keep
reading.
a) Too much power – This is the most common cause of problems. When there is too much
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will cause ambiguity in resolving the position and thus create rings of very high amplitude.
Unless in very shallow water Auto power by Signal mode will automatically try to select the
highest power level that doesn’t cause distortion. You may get the occasional strong return
causing faint rings, but this is good so that you have as much power as practical for detecting
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c) Shading of Receiver – Any difference across the receiver caused by marine growth or
any other irregularity across the face of the receiver will contribute to a reduction in the
discrimination of the WASSP system. This will lead to higher intensity rings.
d) Reconnection Fault – If the cable from the BTxR to the Transducer was disconnected and
has been reconnected recently it is possible the receiver is connected incorrectly. Check the
colour codes of Ethernet connections.
e) Calibration – It is possible that the system calibration was disrupted by another sounder,
close the WASSP GUI and re-run to allow the system to re-calibrate.
f) Electronics Failure – If one or more central channels fail in the electronics this will increase
the intensity of the ring.
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system performance. Restart the WASSP GUI if you are unsure what state the system is in. The
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fails.
