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Reducing interference
Interference from the transmission pulses from other hydroacoustic instruments on board
the vessel is difficult to avoid. The problem may be reduced by choosing the working
frequencies carefully and to some extent by separating the different transducers. On vessels
with a large number of separate hydroacoustic systems installed and in simultaneous use, a
separate synchronizing system (for example the K-Sync) should be considered.
Reducing electrical noise
These points must all be considered to reduce electrical noise on an ES80 system.
• Place the transducer cables in a metal conduit all the way from the transducer to the
transceiver. Terminate the conduit as close to the transducer and transceiver as possible.
• Make sure that the transducer cables are completely separated from other cables, boxes,
other potential noise sources.
• Make sure that all units are properly grounded.
• Use shielded cables with correct grounding.
• Separate the ES80 cables from other cables with high voltages, large currents or
transients. Place all high voltage power cables in metal conduits.
• If you more than one Wideband Transceiver (WBT), install these in such a way that the
transducer cables have the maximum distance to the power and Ethernet cables.
• Ensure maximum physical distance between the Wideband Transceiver (WBT) and
the Power Supply Unit.
• Ensure maximum physical distance between each Power Supply Unit.
• If possible, install the transceivers in a sonar room that is electrically shielded.
Related topics
Acoustic noise, page 53
Preparations, page 41
Vessel coordinate system
The vessel coordinate system is established to define the relative physical locations of
systems and sensors.
When you have several different sensors and transducers on your vessel, and you wish each
of them to provide accurate data, you need to know their relative physical positions. The
antenna of a position sensor is typically mounted high above the superstructure, while a
motion sensor is located close to the vessel's centre of gravity. Both of these are physically
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Preparations
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