Lost Mavic Pro Platinum - Anyone ca figure why it didn't return to home?

Discussion in 'Lost & Found sUAS' started by KayserSoeze, Jul 11, 2018.

  1. KayserSoeze

    KayserSoeze Member

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  2. msinger

    msinger Well-Known Member
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    Please upload your TXT flight log here and post a link back here. You'll find instructions for locating your TXT flight log at that link.
     
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  3. sar104

    sar104 Well-Known Member

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    It didn't return home because it was in ATTI mode due to multiple yaw errors. If you want to know more than that then you will need to post the mobile device DAT file, which includes the magnetometer data.

    How to retrieve a V3.DAT from the tablet
     
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  4. KayserSoeze

    KayserSoeze Member

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    Trying, but get: "Error: Upload timed out." whenever I try.
     
  5. sar104

    sar104 Well-Known Member

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    Which kind of file (txt or DAT) are you trying to upload, and to where?
     
  6. KayserSoeze

    KayserSoeze Member

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    Here is the txt:file. Can't upload the dat file anywhere it seems.
     

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  7. sar104

    sar104 Well-Known Member

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    To upload the DAT file, which is the one with the most useful data in these kinds of cases, you will just need to change the file extension from DAT to txt.
     
  8. KayserSoeze

    KayserSoeze Member

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    Here is the txt from DAT file attached.
     

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  9. KayserSoeze

    KayserSoeze Member

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    Can't seem to upload it there, get "connection timed out". Here is the file attached.
     

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  10. sar104

    sar104 Well-Known Member

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    Do you recall the direction that the aircraft was facing at takeoff?
     
  11. microlinux

    microlinux Well-Known Member

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    DJI Flight Log Viewer - PhantomHelp.com

    I had the same problem until I removed the % symbols from the file name.
     
  12. KayserSoeze

    KayserSoeze Member

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  13. KayserSoeze

    KayserSoeze Member

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  14. RayOZ

    RayOZ Well-Known Member

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    Were you seeing all the popup warnings about compass and yaw error on DJI Go 4 when you were flying?
     
  15. KayserSoeze

    KayserSoeze Member

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    Not when I took off, later on they showed but then it seemed to late. Would the drone just hoover out over the water until it landed in water if RTH didn't work?
     
  16. RayOZ

    RayOZ Well-Known Member

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    The error seems to have been occurring even in mid-flight, not just the end. I'd be worried if the system is encountering these errors and not have notification for the operator. No idea what RTH would do, since it has lost GPS, it doesn't know where it is, so it won't know where to go. If you can recover the drone, the logs inside might shed some light. Considering it seems to have gone into ATTI mode over water, it could potentially just hover till it drop. Too bad you lost connection. If you still had connection, you'd be able to manually fly over land, and land somewhere to retrieve.
     
  17. sar104

    sar104 Well-Known Member

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    That looks like the problem. The compass initialized the IMU yaw value at almost due north, which suggests that there was magnetic interference at the location where you took off:

    18-07-10-10-15-14_FLY037_01.png

    That led to significant discrepancies after takeoff between the compass (magnetic yaw) and the updated IMU yaw derived from the rate gyros. That, in turn, is the cause of the yaw errors and the switch to ATTI mode, after which RTH was not possible.

    We can also look at the difference between IMU yaw and magnetic yaw as a function of magnetic yaw:

    18-07-10-10-15-14_FLY037_02.png

    This does not have the characteristic 2π (360°) periodic variation that appears when the issue is a compass calibration problem - for example this is the equivalent comparison in just such a case that I'm looking at for a different aircraft:

    18-07-10-10-15-14_FLY037_03.png
     
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  18. macoman

    macoman Well-Known Member

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    I always love to see your analysis that prove your knowledge in the area. Very well done sir!!!
     
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  19. WAXMAN

    WAXMAN Well-Known Member

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    It's great we have Sar104 on this web site. Thanks for all you do. Chuck
     
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  20. KayserSoeze

    KayserSoeze Member

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    Wow, thanks for the reply! You really know your stuff.
     
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