3DM-GX4
™
-45
™
Inertial Navigation System
User Manual
Performance Optimization
46
these values will be beyond limits and the flags may be asserted. This fact should be taken
into account when developing automated monitoring systems.
5.12
Vibration Isolation
The 3DM-GX4- 45
™
should be isolated from strong vibrations a much as possible. Strong,
continuous vibrations appear as unaccounted noise to the estimation filter, degrading its
performance.
5.13
IMU Sensor Calibration
All of the sensor internal to the 3DM-GX4-45
™
are calibrated when it is manufactured. With the
exception of the magnetometer field calibration (
see Magnetometer Calibration on page 35
)
recalibration should not be required unless the device has been under conditions that have
exceeded the operating specifications. For example, if the sensor has been exposed to
excessive shock beyond the rated g-force, performance may be compromised. Indications of
internal sensor damage may be seen as measurement offsets or drift when the sensor is in a
neutral motionless position.
5.14
Temperature Compensation
All sensor conversion and calibration formulas include temperature compensation, so all
computed outputs and most of the IMU sensor outputs are automatically adjusted for local
temperature (
see Direct Sensor Measurements (IMU Outputs) on page 23
).