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Confusing of dataflash log NavBrg angle

Posted by C.C. Chang on May 29, 2014 at 9:53pm

I'm so confused about it. 

I graph the data of TargBrg, NavBrg. In my opinion, value of NavBrg should withing 0 and 360 degree, but NavBrg value is greater than 360 in fact.

Is there any thing wrong in parameter setting to APM or it's normal?

What's the mean about the degree is  greater than 360? 

Thanks a lot!!

Chih-Che Chang

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Replies

  • Conan O'Brien June 8, 2014 at 11:07pm

    To me this looks like a bug. Every time the Nav bearing gets above 180 degrees it jumps to over 470 degrees. The maximum angle you are getting in your data is 655.36 or in centidegrees this is 65536 or 2^16 so it looks like a signed 16bit number is being interpreted as unsigned.

    I'm getting the same thing using apm:rover and APM planner instead of mission planner so maybe the bug is in the autopilot code.

    • C.C. Chang > Conan O'Brien June 9, 2014 at 12:00am

      Yes, it seem like a bug.
      The development team have solved the problem.

      look here

      Thanks a lot!!

  • C.C. Chang June 5, 2014 at 6:10am

    Hi 
    I trace code found that NavBrg is centi-degree. And range should within -18000 to 18000.
    But value of my NavBrg log is within 0 to 655.36.
    I still can not solve the question.

    Could anyone help me?

    Thanks a lot!!

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