104 User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN
104 Innomar Technologie GmbH (2023-01)
The range-related setting will automatically adapt the delay according to changed water depth.
In this case the interference will be in a constant distance to the MBES seafloor. Please note that
range-related trigger delay is given relative to the range centre. In the example given above range
is 80 – 140 m; range centre is 110 m and 80 ms (60 m) delay equal 55% of range.
To get two SBP pings within one MBES cycle set “number of pings in one sync pulse” to “2” in
the INNOMAR synchronisation settings. The number of pings should not be higher than the number
of SBP cycles fit into one MBES cycle. Otherwise, the pulse train is generated at each recognized
trigger event as explained in section 6.2.2 on page 83. This may result in increased interference
with the MBES.
The following table summarizes calculations and system settings for different water depths. For
all examples a MBES swath of 130° (like Reson SeaBat 7125) and a water depth of ±10% around
the given mean is assumed, like in the example above.
All calculations based on smallest possible range for the MBES for the given water depth. If the
actually used range is larger or the MBES head is tilted (dual-head system), maybe more than
one SBP ping would fit into one MBES cycle.
To get best results, keep in mind to use smallest possible range length at the INNOMAR SBP.
Water depth (m) 10 20 100
MBES bottom return (ms) 12–35 24–70 120–350
MBES centre swath (ms) 12–17 24–35 120–170
MBES max. ping rate (ms) 50 85 370
MBES max. ping rate (Hz) 20 11 2.7
SBP range start (m) 8 16 80
SBP range length (m) 15 20 60
SBP range end (ms) 30 48 140
SBP bottom return (ms) 12–15 24-30 120–150
max. SBP ping rate (ms) 40 60 200
max. SBP ping rate (Hz) 25 17 5
Trigger delay (ms) 8 16 80
Trigger delay rel. range (%) 40 46 55
Pings for one sync pulse 1 1 1
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