User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN 57
Innomar Technologie GmbH (2023-01) 57
5.10.2 View – Sidescan Processing (“light-plus” and “standard-plus” only)
This is used to set the online Sidescan data processing. These settings
are used for the online echo plot only and will not affect the recorded data.
Soft TVG (time-variant gain) increases the gain with increasing time (distance) to compensate
attenuation by absorption and spreading.
Automatic TVG will set the TVG value automatically depending on range and frequency.
5.10.3 View – Thresholds
Thresholds are used to map the (processed) echo data to
different colours or greyscale levels.
These settings are used for the online echo plots only and
will not affect the recorded data.
Min Level: (range: 1-10, increment: 1) defines the lowest threshold level, higher values can be
used to (visually) remove noise from the echo plot. The optimum setting is where most of the
noise is removed, but with a small amount remaining. This will ensure that no genuine features
are removed from the screen.
SRange: (range: 1-10, increment: 1) defines the upper threshold for echo plot calculation, it limits
the visible dynamic range.
!
Since these settings are not permanent and can be changed during post-processing,
emphasis should be on acquiring good data by adjusting frequency, pulse width and gains
before experimenting with the threshold values.
5.10.4 View – Colours
SBP echo plots can be shown using
different colours or
different shades of grey.
5.10.5 View – SBP Display Style
You can modify the SBP echo plot area to show
both channels (LF and HF) side by side,
the LF data only or
the HF data only
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