Magnetic Mapping Process; Gps/Imu Assembly Process - Headwall Nano-Hyperspec Operation Manual

2.3 MAGNETIC MAPPING PROCESS

To perform the Magnetic Mapping the GPS/IMU device must be mounted to the
sensor, with the GPS/IMU oriented as it will be used during the scanning process.
Refer to Airborne Package Operation chapter for the proper installation and
interconnection procedures.
The magnetic field mapping should be done in a workplace that is free of ferrous materials. The presence of ferrous/
magnetic materials may result in false or erroneous data. The magnetic field mapping procedure consists of the following
steps:
• Mounting of GPS/IMU device to the sensor. This is done following the steps in the first chapter of the Airborne
Operations Manual.
• Recording of calibration measurements using Magnetic Field Mapper software.
• Processing of measurement data by Magnetic Field Mapper software.
• Writing the results to the Motion Tracker GPS/IMU using Magnetic Field Mapper software or by transmitting a
specialized message to the Motion Tracker which is generated by the Magnetic Field Mapper software.

2.3.1 GPS/IMU Assembly Process.

Do not twist the LEMO connector into the GPS/IMU connector. This will damage the
pins and make the cable useless. The LEMO is a push-pull connector.
(1) Locate the LEMO/USB cable and remove it from the airborne package.
(2) Holding the LEMO-Data cable, take the LEMO connector and align it to the silver connector on the GPS/IMU.
(3) Align the red dot on the LEMO connector to the red dot on the GPS/IMU connector, shown in the following
figure. The GPS/IMU unit is shown without a sensor, for assembly method clarity only.
(4) Hold the sensor in place and gently press the two connector pieces together until the connectors appear in the
following, Figure 2-13.
NOTE
CAUTION
Figure 2-12. Align Red Dots, LEMO and GPS/IMU.
GPS/IMU MAPPING
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