User's Manual

Wireless InertiaCube3 Supplemental Manual 23
Doc. No. 072-00096-0E05
The IC3 will produce the same accuracy of results no matter what orientation it is mounted in, but
its natural coordinate system is with the base down and cable coming out the back. If it is
mounted in another orientation then coordinate transformation will either have to occur in your
application or using boresight commands.
6 Dynamic Magnetic Calibration
If there are static field magnetic disturbances even after you have followed the mounting
recommendations closely, you sometimes can compensate for these disturbances by performing a
dynamic magnetic calibration (the full procedure is covered in Section 4.7 of the InertiaCube3
Manual under Compass Calibration Tool).
Indications of the need to perform a magnetic calibration are seen during a 90 degree rotation in
yaw with the InertiaCube reporting a turn close to 90 degrees but then settling at a number off by
more than 10 degrees. If the suspected source of the error if rigidly attached to the IC3, like in a
HMD or a weapons simulator, then a dynamic magnetic calibration may be able to compensate
for most of the offset induced by this source. If the source of error is not attached to the
InertiaCube3, (i.e. the sensor is used within an enclosed metallic environment—automobile
cockpit—but not rigidly attached to this environment) then the magnetic field errors are not static
and cannot be mitigated by using this calibration procedure.