Ellipse
– Operating Handbook
ELLIPSEOHAIR
Magnetic environment
If magnetometers are used for heading
observation, user should also consider the
magnetic environment.
The Ellipse magnetometers require for good
operation a clean magnetic field. The sensor
should be placed away from any magnetic
interference such as: DC motors, radios,
strobe lights, power supplies etc.
GNSS Antenna placement
GNSS antenna must be fixed with respect
to the Ellipse. It should have a clear view of
sky.
The GPS lever arm is the signed distance,
expressed in the vehicle coordinate frame,
from the Ellipse center of measurements,
to the GNSS antenna. It must be measured
within 5cm accuracy.
In addition, this lever arm should be lower
than 10m for best performance.
Note: If the Ellipse is not aligned with the aircraft, lever arms are still taken to the
reference frame of the aircraft, with X pointing forward, Y to the right, and Z down.
This is also the reference frame of the Ellipse considering the re-alignment has
already been applied.
3/13
- 3.51m
0
.2
m
ANT
IMU
Y
X
Z
- 2.5m
1.2
m
IMU
Y
X
Z
