Manual Furuno WMB-3250 Wassp (page 54 of 62) (English)

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Doc. P/N: WSP-009-004

Version: V1.3

Issue Date: August 2013

www.wassp.com

Page 54 of 62

Operator Manual

7.5 Why is there a ring displayed just above the sea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

be there but in practice we want to make it as difcult to see as possible. To avoid these rings

confusing the seaoor tracking algorithms or being confused as sh marks the Minimisation

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

sh on the bottom.

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

the signal return from the seaoor is many

orders of magnitude stronger than a sh

echo and thus the shadow of weaker echoes

can be comparable to sh targets.

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

required minimisation should be 1500 or less. The lower this is the more chance of seeing sh

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

acoustic energy in signals returned from the seaoor they may distort. Distortion of the signals

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

sh.

b) Gain settings. This ring will appear more or less signicant as the sonar gain is changed.

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.

g) Conguration – Changes made in the Technician conguration could signicantly change the

system performance. Restart the WASSP GUI if you are unsure what state the system is in. The

Conguration Manager has a Defaults option to load your default conguration settings if all else

fails.

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