Kongsberg Simrad EK80 Installation Manual page 180

Simrad EK80 Installation Manual
• Define the 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.
• Define the location of the origin in the coordinate system.
The origin is the common reference point where all three axis in the vessel coordinate
system meet. All physical locations of the vessel's sensors (radar and positioning
system antennas, echo sounder and sonar transducers, motion reference units, etc.)
are referenced to the origin.
• Define the vessel's centre line.
• Measure the physical location of each sensor (or sensor antenna). Place it in the
coordinate system.
By means of the vessel coordinate system, the physical location of every sensor can
be defined using three numerical values for X, Y and Z. These values must define
the vertical and horizontal distances from a single reference point; the origin. The
accuracy of the three numerical values for X, Y and Z defines the accuracy of the
sensor data.
• Measure the physical location and orientation of the transducer. Place it in the
coordinate system.
Note
Determining the relative positions and orientations of the sensors and the transducer
with high accuracy is important. This requires professional surveying done by qualified
and trained personnel using proven equipment and methods for maritime dimensional
surveying. We recommend that you use third-party consultants with well proven
experience with vessel dimensional control. Sufficient time and satisfactory work
conditions must be given to the survey work. The installation engineers from Kongsberg
Maritime are neither equipped nor trained to do dimensional surveying.
The information provided by the dimensional survey is entered into the EK80 software
as installation parameters.
Calibration
During the sea trials, calibration surveys are required as described in the EK80 end
user documentation.
In order to check and verify the performance of the EK80 system, we strongly
recommend that calibration surveys are done at regular intervals, or prior to any large
survey. If an existing sensors have been replaced, or a new sensor has been added to the
vessel, a new calibration is required. A new calibration may also be required after an
update of the EK80 software. Refer to the software release note.
The information provided by the calibration is entered into the EK80 software as
operational parameters. This is done automatically.
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