@copilot wrote:
Dear All,
I have recently done some test flights with my Pixhawk powered Y6. The flights were typically either vertical (going up and down at 300m away from me) or in a circle around me (also at about 300m radius). The 4th flight was one of the horizontal circle flights and I repeated it for the 5th flight (exact same flight path). This time shortly after switching to Auto the copter seemed to loose altitude and then started to roll and pitch violently after crashing into the trees about 20m below it.
After viewing the data log I could see that both GPS receivers lost all their satellites at once, then one of the receivers regained satellites for a short period after which it lost again all satellites. Shortly thereafter I assumed it must have crashed as the logs just stopped. The GPS receivers were from two different manufacturers, the first being the Ublox 3DR receiver and the second a RTK receiver running as a normal GPS receiver.
My question is obviously, what happened and how can I prevent this from happening again.
I just flew the flight plan and repeated the exact same one. If it was external influences then why did all go well the first time. How can it just instantaneously loose both GPS receivers like that. Furthermore if I lost GPS signal the parameter FS_EKA_ACTION = 1 which means it should then just have landed right. Maybe it did try to land but how can I see that from the data log? Apparently there should be an ERR message showing the fail-safe condition but I can't find it.
I am attaching the log if anybody has a minute to look at it. I have spent a few hours with it but can't get much more from it other than that the GPS receivers stopped and then the accelerometers shows large deviations from the desired values.
Thanks for your time
The link to the bin file (20MB) is here:
https://drive.google.com/open?id=0BwaLj2GtfXFIQldqNDBKb2RxUkE
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