I notice the APM is (I think) estimating wind speed and direction. I can display wind speed and direction on Mission Planner and in minimOSD. I can't find anything documenting this. How is it coming to this conclusion?
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Replies
Anand,
The method computes true wind vector in earth frame of reference. It has been used routinely for fixed wing aircraft by several autopilots, including APM and MatrixPilot. It does provide a reasonably accurate estimate of both the airspeed and the wind speed without an airspeed sensor, provided the aircraft makes a few turns once in a while. The details of the turn are not important, as long as the aircraft changes direction.
Best regards,
Bill
Patrick,
MatrixPilot and APM are two different autopilot systems with common roots. MatrixPilot runs on the UAVDevboard and APM runs on the various 3DRobotics platforms. Both systems do a fine job of determining wind vector and airspeed without the need for an airspeed sensor.
Here is a link to the original posting on the method that is used:
http://diydrones.com/forum/topics/wind-estimation-without-an
Since you are asking your question on the home of 3DRobotics, I assume that you are using an APM. It is a fine system with plenty of support both from 3DRobotics and the diydrones community.
Best regards,
Bill Premerlani
https://code.google.com/p/gentlenav/downloads/detail?name=WindEstim...
That was way too much math. I stop doing math when letters and other funny looking symbols pop up. I'll take your word for it. Does this apply to or not apply to multirotors?
Pedals2Paddles,
As far as I know, the method referenced by Sam does not work for multirotors. Perhaps someone from the APM team can comment on what they are using for multirotors.
Best regards,
Bill
Pretty cool... I'm looking for something applicable to multirotors, though.
Hi P2P, I've wondered this. I'm hoping to write some code to get a 3d wind vector estimate from a quadcopter for a research application. I was thinking that there should be a way to hack the new EKF code to get this if you assume that differences between observed and expected behaviour are due to wind.
GPS track versus mag heading
GPS ground speed versus airspeed
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