Kongsberg Simrad ST90, Reference Manual

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RCG (Reverberation Controlled Gain)
The
RCG
(Reverberation Controlled Gain) function removes unwanted reverberation
from the bottom and or from the sea surface. This enhances the visibility of schools. It
may however also remove scattered fish from the presentation.
Bottom Filter Threshold
The ST90 system provides a bottom filter to reduce the sometimes powerful echo from
the seabed. This filter is useful if you try to find fish close to the bottom.A higher
numerical value increases the filter efficiency and reduces the bottom echo accordingly.
Noise Filter
The
Noise Filter
removes unwanted acoustic noise from the display presentation. It
reduces the interference from other acoustic systems (sonars and echo sounders),
as well as the noise from the propellers.
Horizontal Scroll
The
Horizontal Scroll
function controls how fast the echoes shall travel across the
Inspection view.
Vertical Reference
During operations in a vertical view you may wish to focus on the echoes in the upper
or lower part of the view. Use
Vertical Reference
to hide a part of the view.
Echogram
The
Echogram
dialog box allows you to control the echogram presentation in the
Inspection views. Two pages control the horizontal lines and the echogram type with
applied TVG (time variable gain). One page controls how fast the echogram travels
horizontally across the presentation.
The following pages are provided:
Lines
The echo presentations in the Inspection views resemble the echograms you see
on an echo sounder. The
Lines
page in the
Echogram
dialog box allows you to
control the horizontal and vertical lines used in the echogram presentation. You
can make the bottom easier to see, and add lines that hold additional information.
The vertical scale of the echogram presentation can be changed. If you wish to
add annotations to your echogram, these are enabled on this page.
Echogram
The echo presentations in the Inspection views resemble the echograms you see
on an echo sounder. The
Echogram
page allows you to choose which type of
echogram you wish to display. You can also control the TVG (Time Variable
Gain). The ST90 system can work with several different TVG compensation
Menu system