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Simrad SN90 Operator Manual
Reducing noise and false echoes with the Ping-Ping Filter
The
analyses the historical information from previous consecutive pings
Ping-Ping Filter
in order to remove unwanted noise and false echoes from the SN90 presentation.
Context
The following filter options are provided.
•
: Select Off to disable the filter. The historical information from previous
Off
transmissions ("pings") are not used to remove noise and unwanted echoes.
•
: Select Weak to allow the filter to compare the echoes from the latest two pings.
Weak
For the current echo to be shown, it must be present in both of these pings.
•
: Choose Medium to compare the echoes from the latest four pings. For the
Medium
current echo to be shown, it must be present in all of these pings.
•
: Select Strong to allow the filter to compare the echoes from the latest eight
Strong
pings. For the current echo to be shown, it must be present in all of these eight pings.
The filters in the SN90 are implemented in "series". The
in the sequence, so any changes to the other filters may have an effect on how it works.
Procedure
1
Click in any view to make it active.
The active view is identified with a thicker border.
2
Open the
Active
3
Select
Ping-Ping Filter
4
Choose the required setting.
The choice you make is by default only applied to the currently selected (active)
view.
Related topics
Improving the recognition of fish and schools using receiver filters, page 79
84
menu.
.
is the last filter
Ping-Ping Filter
381295/B
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