Wind estimate without airspeed sensor

Michael_Larsen 2016-11-02 15:01:20 UTC #1

Hi PX4 team,

I was wondering if there is any plans to include a wind estimate without the need for an airspeed sensor? Like the one used in ArduPlane by Premerlani.

Best regards,
Michael Larsen

CarlOlsson 2016-11-02 17:29:56 UTC #2

Hi Michael,

This is a work in progress

Michael_Larsen 2016-11-02 17:43:20 UTC #3

Hi Carl,

Sounds great. I can't tell immediately, but will this be part of the stable branch in near future?

/Michael

dagar 2016-11-02 17:53:17 UTC #4

I'm just curious, how well does it work in ArduPlane?

Michael_Larsen 2016-11-02 18:13:29 UTC #5

Well, I don't have any truth sensor to compare with. But it is my impression that the wind estimate, magnitude and direction is rather good. At least it gives an idea. I find that especially the direction is useful in order to make a good landing approach.

CarlOlsson 2016-11-03 05:42:29 UTC #6

This is the estimated wind direction from a flight without airspeed sensor.

The red lines are the min and max values from a ground truth wind direction sensor on the ground with a resolution of 12.5 deg.
Unfortunately the part of the the ground sensor measuring the wind amplitude broke just before the flight (due to too high winds..) My impression is also that the wind direction should be pretty accurate from the estimate, but more data has to be collected to evaluate further.

Michael_Larsen 2016-11-03 06:20:57 UTC #7

Hi Carl,

That looks promissing. Are the small "jumps" in the estimate, at ~800 and ~1600 when the plane is turning?

Johannes 2017-06-20 13:28:54 UTC #8

I used the synthetic sideslip wind estimate without an airspeed sensor on the 1.5.5 release - and it worked Great! I Have tried to do the same with the 1.6.2 stable release but I can not get it to work correct. All I get is something that looks like estimation noise with a magnitude of 1/10 of what I assume is the actual wind speed.

I am using the parameters described in https://github.com/PX4/ecl/pull/207

Am I the only one that is getting this wrong?

CarlOlsson 2017-06-21 21:42:55 UTC #9

Hi @Johannes
Glad that the sideslip fusion was working If you have problems now after updating, could you please describe the issue and link a logfile here https://github.com/PX4/ecl/issues