Dual Head Configuration
The WBMS systems provide high-resolution data in single-head mode. However, for shallow water
applications where survey speed and efficiency need to be maximized, NORBIT provides a dual
head solution that is extremely simple to set up and use. Especially in shallow waters, NORBIT’s
dual head solution will yield swath coverage of up to 25 times water depth enabling surveyors to
collect data very quickly and efficiently. Alternatively, two heads may be employed in downward
looking orientation where one head is mechanically or electronically pitch steered for a multi-ping
operation for increased along track sounding density.
If a SIU-I-NAV (an integrated SIU, part no. 29028) is used, the secondary sonar can be connected
to the same SIU via the auxiliary port. For SIU versions
29028-4 and older, the power supply unit will require an
upgrade to power two sonars. Please contact NORBIT if you
have questions about upgrading your system for dual-head
readiness.
However, if two SIU-I (stand-alone SIU, part no. 29024) are
used with a third party IMU, the primary sonar should
connect to one SIU and the other sonar should connect to
the second. Please note that if two SIU-I are used, timing in
the form of a ZDA message and PPS over BNC must be
supplied to both sonars. In addition, a TTL sync cable must
be used between the two SIUs contact NORBIT support if
you require this cable.
To set up a dual-head system the sonars can be mounted on a dual-head bracket, sold separately
by NORBIT. Please refer to the Dual Head Bracket section for a detailed schematic or contact
NORBIT Support for more information. Alternatively, each sonar can be attached to a single-head
bracket and mounted over each side of the boat. While this configuration may be more difficult to
implement than utilizing a dual-head bracket, the wider separation will provide additional coverage.
NOTE: Dual Head Offsets
When setting up an iWBMS in a dual head configuration IMU rotations and
offsets will change. For further information on this please refer to the
NORBIT tilted sonar technical note (document TN-190018) and/or the
NORBIT Dual Head Quick Start Guide. If you do not have this document,
please contact NORBIT support.
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