Fixed Wing Autoland
The autopilot will automatically land on a landing waypoint.
Set a landing waypoint at ground altitude in QGroundControl. The landing direction will be defined by the direction of the previous waypoint (last mission waypoint) towards the landing waypoint. The system will try to touch down at the landing waypoint position.
These are the main parameters for landing. Note that the maximum accuracy for a good ground estimate is 2-5 meters based on barometric pressure and GPS and that a laser distance sensor is required for spot-on reliable landings. The system will land fine without, but might under or overshoot by a few meters due to altitude variations (needs more space / longer runway).
FW_LND_ANG- The landing slope
FW_THR_LND_MAX- The landing throttle (maximum throttle when touching down, which is defined as being below FW_LND_TLALT)
FW_LND_TLALT- The altitude at which the throttle will be limited
FW_LND_RFRALT- If set to 1, the system will use a relative altitude estimate if available, such as a laser distance sensor
FW_LAND_HHDIST- The heading hold (only small roll angle allowed) horizontal distance. This parameter ensures that the system will not touch the ground with one of the wings.
FW_LND_FLALT- The vertical ground distance / relative altitude at which the system starts to flare.
Landing Slope and Final Flare
laser sensor for autoland
If a precise landing is required or if it is a bigger/heavier aircraft, a laser sensor is required to get precise results.
There you have to set FW_LND_USETER on 1 to integrate the terrain estimate with laser. Do double check/adjust the SENS_BARO_QNH to the actual AMSL height. Otherwise it will not work precise.