User manual

U-See User Manual - Settings Menu

2.12.9

Magnetometer Calibration

The performance of the magnetometer will greatly depend on its installation location. A

magnetometer relies on the earth’s magnetic field to provide heading. Any distortions of

earth magnetic field by other sources such as a UAV massive iron components should be

compensated for in order to determine an accurate heading. Sources of magnetic fields in

any UAV include permanent magnets mostly in its motors, electric currents flowing in its

wiring—either dc or ac, and Ferro-magnetic metals such as steel or iron. The influence of

these sources of interference on a magnetometer accuracy can be greatly reduced by

placing the compass far away from them.

Magnetometer is very important in rotary wing UAV, do not fly a rotary wing UAV if the

magnetometer alarm is triggered (red color alarm displayed).

Magnetometer is not necessary in fixed wing UAVs.

The field effects can be compensated by way of calibrating the magnetometer for a

defined location in terms of magnetic interference. In order to calibrate the magnetometer

the U-See operator must follow those steeps:

1.- Turn on all the electronic parts of the UAV

2.- Wait until temperature stabilizes and GPS navigation fix is valid.(GPS alarm green color)

3.- Place the UAV on a flat surface.

4.- Open the Magnetometer Calibration window on U-See software.

5.- Click Start button and manually turn the UAV more than 360 degrees. Make this turn

with the UAV leveled. Do not turn too fast, finish more than one turn at the same time than

the progress bar reaches 100%

6.- Click Set button.

7.- Check than the magnetometer alarm stays green orientating the UAV north, east, west

and south. If it's not go to steep 5.

8.- Go to Setting>Save Changes and click Yes button to save the new calibration into the

non volatile memory of the U-Pilot.

Document Version 1.25 68

Figure 60: Magnetometer Calibration Window