Kongsberg Simrad ST90, Reference Manual

Page: 125 / 690

442704/A
123
The choice you make is by default only applied to the currently selected (active) view.
Related topics
Operating procedures, page 79
Improving the recognition of fish and schools using receiver filters, page 117
RCG (Reverberation Controlled Gain) function, page 484
Reducing noise and false echoes with the Ping-Ping Filter
The
Ping-Ping Filter
analyses the historical information from previous consecutive pings in
order to remove unwanted noise and interference from the echo presentation.
Context
The following filter options are provided:
•
Off
: Select
Off
to disable the filter. The historical information from previous
transmissions ("pings") are not used to remove noise and unwanted echoes.
•
Weak
: Select Weak to allow the filter to compare the echoes from the latest two pings.
For the current echo to be shown, it must be present in both of these pings.
•
Medium
: Choose Medium to compare the echoes from the latest four pings. For the
current echo to be shown, it must be present in all of these pings.
•
Strong
: Select Strong to allow the filter to compare the echoes from the latest eight pings.
For the current echo to be shown, it must be present in all of these eight pings.
The filters in the ST90 system are implemented in “series”. The
Ping-Ping Filter
is the last
filter 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
menu.
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.
Operating procedures