POS MV V4 User Guide
Installation
Copyright © Applanix Corporation, 2009
2-41
The accuracy with which you measure the mounting angles will affect the
accuracy of measurements made by the multi-beam 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 multi-beam 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 multi-beam sonar.
Additionally, some multi-beam sonar may calculate the beam forming
parameters incorrectly.
• Perform a ‘patch test’ to determine whether there is any uncorrected
misalignment between the multi-beam 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 multi-beam 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
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