JJB*
Core User of DJI
Flight distance : 12225059 ft
Netherlands
Offline
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I think that the baro sensor is correct, if it was correct during that unwanted descend i don`t know. Airflow around the sensor can disturb correct measurements.
In my chart see ID 1372, 2m17.1s : no more down input, but craft is still descending (see V-z)
V-z zero but when VPS height starts to indicate ; V-Z in minus values again.
Pulling up and time needed to stop the descend 0.8 second. I this too much? normally not noticed when flying at higher altitudes.
Ofcourse i don`t knwo the reason for dropping, but imo has something to do with suddenly and not correct measurement of VPS bottom sensor ; not a fault, moving water is killing for accurate measuring.
So i think that your fully UP stick did the job, drone stopped down move and went up again. It did react OK imo, but for you to slow seeing the craft almost going down!
Its up to you to have a check done by DJI or not.
DJI text about Vision is, for me, confusing.
Vision is added to the GPS to maintain better hover performace, ofcourse withing vision range.
In their text they write about 'enabled', i think they mean to say when the system is used as its always ON.
I do believe that Vision is also used for height hold, in addition to baro sensor. Vision as fine tuning for baro info??
If not why all the warnings and exceptions for the vision in the manual? If i fly with good GPS lock my position flying low altitude is no problem, height is kept steady by baro sensor. But when VPS start to measure (thus for positioning and height) things can go wrong....
Hope that DJI will explain better in their manuals, how the systems interact wich each other.
cheers
JJB
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