Analysis of robustness of heading capability of e-compass on drone system

Heading capability of e-compass used affects flying performance of a drone system. By reading output data of magnetometer inside drone system in different level of throttle or rpm of blade motor, we can evaluate how robust is the heading capability of the magnetometer.

This diagram shows the output of magnetometer is basically intact on different levels of throttle (yellow line) when drone is fixed in a static position. This phenomenon is the outcome of a robust magnetometer design.

While this case shows that the output of the magnetometer is impacted by change of throttle level (blue line in the bottom diagram) when the drone is fixed in a static position,. The reading of the magnetometer cannot even return to its initial value when throttle is released. There are faults in the design or application of the magnetometer that cause this kind of failure.