innomar SBP smart - Running the INNOMAR SBP Triggered by a Multi Beam System

User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN 101
Innomar Technologie GmbH (2023-01) 101
7.6.2 Running the INNOMAR SBP triggered by a Multi Beam System
In shallow water or in ROV applications the MBES should trigger the INNOMAR SBP. How to set
up this is exemplified by the Reson SeaBat 7125 MBES that cannot be triggered externally and
is typically used in shallow water.
Connecting Trigger Lines
The trigger output of the MBES has to be connected to the trigger input of the INNOMAR SBP
(“Sync IN” BNC connector at the front panel).
If a Dual-Head version of the Reson SeaBat 7125 is
used, keep in mind that the two topside units
generate the trigger pulse. There are interleaved
pulses from the starboard and portside unit. To
ensure best SBP performance, both trigger lines
should be OR-wired to get both trigger pulses to the
INNOMAR SBP:
Trigger OUT connectors at SeaBat 7125 topside
units (BNC connectors at rear panel)
Diodes should be of Schottky type to get lowest possible voltage drop.
INNOMAR SBP settings
Within the INNOMAR SESWIN control software a trigger delay (time offset) can be applied via the
menu “System Setup – Settings – General – Synchronisation” if triggered externally:
A general description of this dialog is given in section 5.11.3 on page 60. Options for external
synchronisation are described in detail in section 0 on page 81.
This trigger delay shifts the interference caused by the SBP onto a certain depth level and the
wrong depth values can be removed easily. The following pictures illustrate the shift of wrong
water depth values of the centre beam(s) within the MBES screen with increasing trigger delay.
An optimal setting for the trigger delay would be if the starting time for the INNOMAR SBP pulse
were just half of the water depth (trigger delay about 40 – 60% of range as shown in the screen
shot above). Please note that the delay can be given absolutely in microseconds and/or relative
to range. Both values will be added to get the total delay.
If the delay time increases, some interference from the transmitted signal of the INNOMAR SBP
will be visible on top of the MBES Screen. All the interferences above and below the real seabed
can cause wrong detected points and gaps in the seabed. Apart from post-processing steps to
remove these wrong points, it is often possible to adjust a depth filter directly within the MBES
operating software.
RESON StB
Trigger OUT
RESON Port
Trigger OUT
SES-2000
Trigger IN