POS MV V4 User Guide
Installation
Copyright © Applanix Corporation, 2009
2-11
• Avoid mounting the IMU where it may experience high levels of
vibration, shock or electrical noise.
• The standard IMU connection cable is 8 m (~26 ft) long. Plan the
system layout carefully so that the cable will fit between the IMU and
the PCS. Do not subject the cable to sharp bends or other
mechanical stresses. Applanix can supply a longer cable of up to
50 m (~164 ft) in length if necessary. Use suitable clips to support the
cable at intervals along its length.
• Ensure the mounting location permits easy access to attach the cable
to the IMU.
• Mount the IMU with its base plate nominally level.
• Ideally, install the IMU at a location for which you require roll, pitch,
heading and heave measurements. Usually this implies mounting the
IMU close to, or even on, the multi-beam transducer. The chosen
location must provide rigid support so that the IMU does not move
relative to the GNSS antennas; see
GNSS System on page 2-6.
• It is not necessary to install the IMU at the vessel’s centre of rotation.
There is no degradation of POS MV performance if the IMU is
mounted away from the vessel’s centre of rotation, although this
offset should be measured and applied during configuration of the
system; see the
POS MV Configuration topic starting on page 4-11.
• There is a label on the top plate of the IMU to identify its sensing axis.
It is not required to align these marks closely with the vessel or the
multi-beam transducer. Instead, measure the mounting angles, save
them in the PCS when you first power-on and configure the system.
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