52 User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN
52 Innomar Technologie GmbH (2023-01)
5.9.4 Home – Gain SBP
(not for “smart” model)
This is to manually set or adjust the gains on the
LF and HF SBP channels. Gains employed
during data acquisition are final, they are set by
the hardware and cannot be changed later.
The Increments for Gain changes are set in the “Gain Definition” dialog (range 1 – 6 dB). A good
value would be an increment of 2 or 3 dB. (Not available for the “smart” model.)
A Deep-Water Amplifier will be applied to the HF data separately if the check box is activated.
This gives another 12dB gain for the high-frequency SBP data. (Not available for the “smart”
model.)
LF Gain / HF Gain (range 0 – 60 dB for the “smart” model; 0 – 80 dB for the other models) have
to be set to adapt the dynamic range of the (analogue) receiver signal to the ADC unit (analogue
to digital converter) in order to ensure best data quality.
To optimize the gain settings, you should use the signal amplitude shown in the SBP signal
window, which is divided by four lines. Thus, each of the five sections represent 20 percent of full
scale (FS). Best is to maintain a maximum amplitude of 60 – 80% FS. This gives space for
sudden peaks and ensures a good dynamic range, see below.
Gain too low, could be safely increased by
6dB.
Gain almost ideal, there is room for sudden
peaks and the dynamic range is used well.
Gain too high, this will result in a distorted
signal and should be avoided.
5.9.5 Home – Gain SSS (“light-plus” and “standard-plus” only)
This is to manually set or adjust the gains on the Sidescan channels. Gains
employed during data acquisition are final, they are set by the hardware
and cannot be changed later.
The gain increment is fixed to 6dB. For optimal gain settings see above.
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