Vessel Coordinate System - Kongsberg EM 2040P Installation Manual

simultaneous use, a separate synchronizing system (for example the K-Sync) should
be considered.
Reducing electrical noise
• Make sure that all units are properly grounded, as this is important to avoid electrical
noise.
• Use shielded cables with correct grounding.
• Separate EM 2040P cables from other cables with high voltages, large currents or
transients.
• Place all high voltage power cables in metal conduits.

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 positioned far away from the transducer on a depth sensor, which may be
located closer to the bow.
Very often, the information from one sensor depends on data from an other. It is then
important that the relevant measurements are compensated for these relative distances.
Example
If you wish to measure the actual water depth, you will need to know the
vertical distance from the echo sounder transducer to the water line. Since
the vessel's displacement changes with the amount of cargo, fuel etc, the
physical location of the water line on the hull must either be measured at a
regular basis, or measured with a second sensor.
In order to establish
a system to measure
the relative distance
between sensors, a
virtual coordinate system
is established. This
coordinate system uses
three vectors; X, Y and Z.
The X-axis is
A
the longitudinal
direction of the
vessel, and in
417418/B
Preparations
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