Has anyone had experience with compass calibration on a very large drone? On platforms with 1600mm+ frames and close to 55lbs it is not feasible to perform calibration on all 6 axis’s while holding the drone.
I suppose one could build a rig that suspends the aircraft to help with initial calibration but would not be practical for calibrations in the field. (i.e. re-calibrating in a new region)
Also i dont think it’s necessary to recalibrate the compass at each flying site unless you’ve actually changed electricals that might affect the compass. I know that many people don’t and I don’t.
There’s some discussion on this already, I’ll see if i can find it.
Thanks for the info. That seems like a viable solution but I would rather wait until it is released in a stable FW release. I would be hesitant to test any new feature in-flight on a large drone with an expensive payload.
Unless the location of your magnetometers on your aircraft changed, or your configuration of the aircraft changes in a way that would change the magnetic field (see the Magnetic Interference page), you should only have to calibrate your compass once. As long as you have a GPS, your declination should be automatically set and you’ll be good to go.
I believe the sky viper team got around doing the compass dance by referencing a calibrated compass with their un-calibrated drones. The process went like this:
Calibrate a compass, and you end up with something that accurately reads Earth’s magnetic fields. Place it in a specific XYZ coordinate on Earth and record what the compass says.
Place an un-calibrated compass in the same exact XYZ coordinate. That compass’s readings subtracted from the true compass’s readings is your offsets. You don’t get all the diagonals but you do get a flyable calibration.
Or, as others have mentioned, in-flight calibration is on its way.