Prerequisites
Determining the relative positions and orientations of the sensors and the transducer with high accuracy is important. This requires professional land surveying done by qualified and trained surveyors using proven survey equipment and methods
. 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.
We strongly recommend that you make the dimensional survey measurements when the vessel is in dry dock.
Context
All measurements must be made after the installation of the transducer and the navigation sensors The following measurements must be made for each sensor:
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Physical position with reference to the vessel coordinate system (X, Y and Z) and the chosen origin. |
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Angular values (pitch and roll) |
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Heading with reference to the centre line |
NoteFor all measurements, observe the relevant accuracy requirements.
Procedure
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1 |
Establish the vessel coordinate system. |
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Define the centre (origin) of the coordinate system, and - if required - identify this location physically. |
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Set out the required coordinate reference points throughout the vessel. |
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Establish the vessel’s centre line, and - if required - identify this line with physical markings. |
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Make the necessary position and angle measurements of the transducer. |
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Make the necessary position and angle measurements of the motion reference unit (MRU). |
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Make the necessary position and angle measurements of the heading sensor. |
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Make the necessary position and angle measurements of the antennas for each global positioning system (GPS). |
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Make the necessary position and angle measurements of other relevant sensors. |
Result
All results from the dimensional survey measurements must be summarized in a report by the consultants doing the work.
Further requirements
In order to check and verify the performance of the MS70 system, we strongly recommend that calibration surveys are done at regular intervals, or prior to any large survey. If existing sensors have been replaced, or new sensors have been installed, a new calibration is always required. A new calibration may also be required after an update of the MS70 software. Refer to the software release note.