The command is sent by a dedicated mavlink command and forwarded to the fixed wing position controller.
The pattern is defined by the radius of the major axis, the radius of the minor axis and the orientation. The pattern is then defined by:
The upper part of the pattern consist of a clockwise circle with radius defined by the minor axis. The center of the circle is defined by the major axis minus the minor axis away from the pattern center.
The lower part of the pattern consist of a counter-clockwise circle with the same definitions as above.
In between, the circles are connected with straight lines in a cross configuration. The lines are always tangetial to the circles.
The orientation rotates the major axis around the NED down axis.
The loitering logic is defined inside its own class used by the fixed wing position control module. It defines which segment (one of the circles or lines) is active and uses the path controller (npfg or l1-control) to determine the desired roll angle.
A feedback mavlink message is send with the executed pattern parameters.
A setpoint of type IDLE can be published by Navigator without a valid position,
and should be handled in the auto function in FW_POSCTRL_MODE_AUTO. If it wouldn't be
handled there the controller would switch to mode FW_POSCTRL_MODE_OTHER, in which case
no attitude setpoint is published and the lower controllers would be stuck with the
last published value (incl. thrust).
Signed-off-by: Silvan Fuhrer <silvan@auterion.com>
* FW Positon Controller: set altitude_ref to 0 if not provided by GPS
Signed-off-by: Silvan Fuhrer <silvan@auterion.com>
* FW Positon Controller: set lat/lon reference to 0 if not provided in local_position
Signed-off-by: Silvan Fuhrer <silvan@auterion.com>
---------
Signed-off-by: Silvan Fuhrer <silvan@auterion.com>
- force initialize takeoff airspeed setpoint at start of takeoff modes
- force set airspeed constraints if slewed value is out of bounds
- always slew airspeed setpoints as long as inside constraints
- move target airspeed setpoint calculation into mode specific logic regions (hand vs runway)
when we're in a takeoff situation, we only want to adapt the airspeed to
avoid accelerated stall due to load factor changes. Disable othre logic
like minimum ground speed, wind based adaption and airspeed slew rating.
Signed-off-by: Silvan Fuhrer <silvan@auterion.com>
