Kongsberg Simrad EK80, Руководство по установке

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Related topics
Dimensional surveying, page 176
Dimensional survey accuracy requirements
for echo sounding operations
No specific requirements have been defined for the dimensional survey.
Related topics
Dimensional surveying, page 176
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.
Simrad EK80 Installation Manual