Magnetic Field Warning - Intel Falcon 8+ User Manual


Table 3-7. Possible warnings
The following messages are only shown in the notification area on the touchscreen tablet.
Tablet battery empty!
Tablet battery weak!
3.12.1

Magnetic field warning

While starting the Intel Falcon 8+ UAV, a magnetic field warning may occur.
Usually disturbances on the ground come from underground lines and can quickly be
resolved by switching off the Intel Falcon 8+ UAV, moving it to a different spot and
starting from there. 
Alternatively it is possible to start in Height-Mode to avoid any position corrections by
the system, which might occur in GPS-Mode and only activate GPS once in the air. The
magnetic disturbance will then be at a safe distance and the estimation algorithms will
be active.
Figure 3-18. Acoustic and visual magnetic field warning
Regarding
UAV
In flight the Intel Falcon 8+ UAV uses algorithms to detect possible disturbances of the
compass sensors. If there are discrepancies between the magnetometer output and the
expected orientation, the UAV's heading is estimated using the other available IMU
sensors. This technology enhances the robustness of the UAS against external
disturbances of the magnetic field.
Note: Since the IMU sensors, like accelerometers, are needed to estimate the heading, the
compass estimation does not work as long as the UAV is standing still on the
ground. During start-up the current magnetic field is compared to the expected
®
TM
Intel Falcon F8+
The battery of the
touchscreen tablet is
empty.
The battery of the
touchscreen tablet is low.
Visual and acoustic signal
Acoustic:
A constant loud beep is heard.
Visual (on Status Display):
User Manual
shown only on tablet
shown only on tablet
Explanation
This warning only appears when the system is not yet
flying. It means the UAV is close to a magnetic field,
which disturbs the correct determination of the UAVs
orientation. Thus starting in GPS-Mode can lead to
uncontrolled movement of the UAV in the attempt to hold
the exact position. 
To resolve this warning:
1. Switch OFF the Intel Falcon 8+ UAV, the touchscreen
tablet and the CTR.
2. Move the UAV to a different spot and switch the
complete system ON again.
3. If the warning is no longer presented, you can take
off in GPS-Mode.
If the warning is not resolved or if taking off from a
different spot is impossible, you can:
1. Switch to Height-Mode and take off in Height-Mode
to avoid any position corrections by the system,
which might occur in GPS-Mode.
2. Fly to open space and keep Height-Mode activated
for at least 20 seconds (it will help the estimation
algorithms to do some movements forward,
backward, left and right).
3. Switch to GPS-Mode in open space. The magnetic
disturbance will then be at a safe distance and the
estimation algorithms will be active.
4. Always be prepared to switch back to Height-Mode
anytime.
83