POS MV V5 Installation and Operation Guide
Installation
2-26
defined. It may be convenient to define the reference frame to be coincident with the multibeam
transducer for example, in which case the mounting angles for this relationship will be zero. Note that, by
definition, the vessel frame and the reference frame co-align.
The accuracy with which you measure the mounting angles will affect the accuracy of measurements
made by the multibeam sonar:
•
Measure the mounting angles to the same degree of accuracy that you require of POS MV. For
example, if you require POS MV to deliver roll measurements for multibeam sonar compensation
to an accuracy of 0.02°, then you must measure the mounting angles to an accuracy of 0.02°.
•
Not measuring the mounting angles to the required accuracy will cause a constant offset in all the
images from the multibeam sonar. Additionally, some multibeam sonar may calculate the beam
forming parameters incorrectly.
•
Perform a ‘patch test’ to determine whether there is any uncorr
ected misalignment between the
multibeam sonar and the POS MV. Many operators have a defined procedure to complete a
patch test to refine the accuracy of the POS MV and multibeam sonar interface. The Patch Test
topic on page F-1 describes a suitable patch test procedure that can be used.
The following subsections of this manual explain how to measure the lever arm distances and mounting
angles in readiness to configure POS MV.
Note:
After you have made all the required physical measurements on the POS MV installation, refer to
the System Configuration description on page 4-1 for instructions on configuring the system and saving
all the information to non-volatile memory.
Lever Arm Distances
Before starting to measure the lever arm distances, you must define a reference starting point. Choose an
easily identifiable point at some convenient location on the vessel that allows you to measure offset
distances in three axes. The reference point must be fixed and rigid relative to the IMU, the GNSS
antennas and the multibeam transducer.
Measure and resolve the lever arm distances using the reference frame:
•
X lever arm - the distance measured along the surveyed horizontal fore-aft axis of the vessel (X is
positive towards the bow of the vessel)
•
Y lever arm - the distance measured along the surveyed horizontal port-starboard axis of the
vessel (Y is positive towards starboard)
•
Z lever arm - the distance measured along the surveyed vertical axis of the vessel (Z is positive
down)
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