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484
442704/A
Note that
Gain
,
TVG
(Time Varied Gain) and
Display Gain
are not filters, but included
only to illustrate the complete "signal path".
Details
Off
The automatic gain control (AGC) is disabled.
Weak
A mean value for all the echoes is established. The value is used as a threshold.
Echoes below this threshold are suppressed.
Medium
The threshold value is increased by 3 dB compared to
Weak
.
Strong
The threshold value is increased by 3 dB compared to
Medium
.
Related topics
Improving the recognition of fish and schools using receiver filters, page 117
Functions and dialog boxes, page 416
Active menu; Functions and dialog boxes, page 466
RCG (Reverberation Controlled Gain) function
The
RCG
(Reverberation Controlled Gain) function removes unwanted reverberation from
the bottom and or from the sea surface. It may however also remove scattered fish from
the presentation.
How to open
You open this function from the
Active
menu.
Description
Reverberation is often regarded as noise.
There are several types of reverberation.
Volume reverberation
The volume reverberation is caused by minute plankton and air-bubbles in the water.
This reverberation has often daily cycles in intensity.
Simrad ST90 Reference Manual
Содержание Simrad ST90
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