Calibration Method - Headwall Nano-Hyperspec Operation Manual

GPS/IMU MAPPING

2.3.3 Calibration Method.

During a 3D calibration measurement, the object to which the sensor is attached has to be rotated through as many
different orientations as possible, it may help to think about 'scanning' the surface of a sphere with the GPS/IMU x-axis.
It is important to cover as many orientations as possible, at least as many to cover the application's envelope of motion. It
is required to hold the GPS/IMU in as many different orientations as possible. To reach all points, a calibration trial of
around 3 minutes should suffice, provided that the object is rotated over a sufficiently large angle and held sufficiently
still.
The MFM algorithm will find a solution, even if there is only a partial capture. This means that when the MFM has been
performed in the orientations of the intended application only, the heading will be accurate in those orientations. The
Magnetic Field Mapper will indicate if the measurement was sufficient.
(1) When the sequence of rotations is completed, press Process to end the measurement and to start the data
analysis.
(2) If the measurement is successful, the results can be stored in the non-volatile memory of the GPS/IMU.
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Figure 2-17. Data Capture Progress Window.
Figure 2-18. Magnetic Field Mapping Processing Window.