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Velocity Variance

Posted by Anthony Kirk on March 24, 2016 at 10:45am

Can anybody explain what Velocity Variance means?

I am guessing, the EKF is seeing a conflict between GPS, Airspeed and perhaps accelerator.

If this is the case how would one go about resolving such a conflict?

Thanks

Anthony

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Replies

  • RogerCon March 24, 2016 at 12:20pm

    Hi

    I had this error when I was trying Auto Takeoff. 

    I had my ARSP_MAX too low at 18ms and when it lauched it got up to 20m/s. I changed that to 25m/s now

    The other thing I changed is the Airspeed sensor. (cheap HK kit) that I dont think was working well, It would sometimes show to large speed variances on the ground.

    I turned it off, and I dont use it anymore.

    Anyway, after those changes the error didn't came back.

    • Anthony Kirk > RogerCon March 24, 2016 at 2:42pm

      This is helpful to know. the sensor I am using is the 3DR digital. 

      Perhaps the warning / error is caused by too big a change in the sensor between samples.

      Thanks Anthony.

      I see many other posts from people asking about this but no explanation as to what the trigger is.

      Perhaps we can use this thread to document as many possible causes, fixes and experiences. 

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