56 User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN
56 Innomar Technologie GmbH (2023-01)
Soft TVG (time-variant gain) increases the gain with increasing time (distance) to compensate
attenuation by absorption and spreading. TVG starts at the seabed (for bottom track see also
“Home – Depth” menu). TVG values should generally be kept low, typically 0.2 or 0.4 dB/m.
Median Filter: If activated a digital filter is used to remove peak noise from the echo data. This
filter will also help to remove noise caused by other acoustical systems, resulting in stripes or
regular patterns due to their pinging regime.
Resolution:
For processing the echo data there are different display
modes available:
“Amplitude View”: shows the amplitude (magnitude) of the
echo envelope,
“High Resolution View”: shows the (positive) gradient of
the echo envelope to enhance amplitude changes,
“Raw Data View”: shows the (positive) raw (full waveform)
data.
Amplitude View
High Resolution View
In general, “High Resolution View” should be used, it will provide the most detailed picture of
sediment structures. The “High Resolution” processing reduces the signal-to-noise ratio slightly.
Therefore “Amplitude” processing may be better if noisy data are processed. “Amplitude View” is
also useful for getting an overview about major sediment packages or for water-column analysis,
for instance when looking for clouds of gas-bubbles. “Raw Data View” is used when looking for
small objects like pipelines or cables.
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