mavic gains altitude on its own

xrider · May 19, 2023

hello everyone
im posting this as my classic started to gain altitude on its own and really dont know whats the cause of this.. imu has been calibrated and sensors are clean.. im posting a log hoping someone could shed some light as its the second time i see this weird thing.. note that by the time the flight took place weather was cloudy.. no sun flares..

fw is up to date at the latest version both in rc and ac
thanks in advance
xrider

Yorkshire_Pud · May 19, 2023

the log on PhantomHelp

DJI Flight Log Viewer - PhantomHelp.com

Meta4 · May 19, 2023

xrider said:
im posting this as my classic started to gain altitude on its own and really dont know whats the cause of this.. i

There's 10.5 mins of flight and a few thousand lines of data to wade through.
It would help if you could point to where in the flight you observed this.

Yorkshire_Pud · May 19, 2023

Meta4 said:
There's 10.5 mins of flight and a few thousand lines of data to wade through.
It would help if you could point to where in the flight you observed this.

Try 39 sec to around 69 sec. 50ft to 118ft during which the throttle is mainly centred or partially closed though there are a few throttle opened lines.

I am wondering if the drone flew into a clear patch of sky and the OA saw the sun as an obstacle?

Solar elevation angle (for a day) Calculator

Calculates a table of changes in the solar elevation and azimuth angles for a day and draws the chart.

keisan.casio.com

Even if I am wrong and get corrected the correction will hopefully be informative and a learning experience (for me at least).

xrider · May 19, 2023

Meta4 said:
There's 10.5 mins of flight and a few thousand lines of data to wade through.
It would help if you could point to where in the flight you observed this.

it does that in the whole flight.. ex if you check stick position in 00.38 and 00.52 you will clearly see that it gains altitude pretty fast without any stick input.. sticks are calibrated as well.. there was no sun at that moment to tell that the sun was "blinding" the drone.. if it was like that it should hit the brakes.. no braking.. only uncommanded altitude gain in the whole flight.. go figure whats goin on..

xrider · May 19, 2023

Yorkshire_Pud said:
I am wondering if the drone flew into a clear patch of sky and the OA saw the sun as an obstacle?

clear of obstacles and no sun..

Meta4 · May 19, 2023

xrider said:
it does that in the whole flight.. ex if you check stick position in 00.38 and 00.52 you will clearly see that it gains altitude pretty fast without any stick input.. sticks are calibrated as well.. there was no sun at that moment to tell that the sun was "blinding" the drone.. if it was like that it should hit the brakes.. no braking.. only uncommanded altitude gain in the whole flight.. go figure whats goin on..

There's no smoking gin showing up in the data.
Does this happen every flight or just some?
You could try disabling obstacle avoidance and flying to see if that makes any difference and possibly eliminate that possibility.

PHZ · May 19, 2023

A stick calibration could possibly help.

Yorkshire_Pud · May 19, 2023

@xrider , this stems from processing the Phantomhelp csv with CsvView

CsvView Downloads

It's quite a handy view at times.

Yorkshire_Pud · May 19, 2023

How did you upload the log to air data, automatically via the App or manually from computer etc?
If manually it might be worth checking the MCDATFlightrecordsfolder to see if there are any DATs in there, you are looking for one whose name contains either FLY0102 or FLY102.
If you have that file, save it to computer and upload the DAT to a file hosting website, make the page public and post its URL here.

,

xrider · May 19, 2023

same thing happens even in sport mode.. stick calibration and imu calibration has been done before this thing with altitude happened.. i also can see that pc doesnt recognise the videos that i take.. it says that it needs some kind of codec and in properties i see that bitrate is around 120mbps.. went into assistant one more time.. and there is no option to downgrade the fw.. paid around 2k € for a drone that i simply cant fly..

as for log files.. ive connected the dji rc via usb to pc and then uploaded the logs to airdata.. im going to upload to phantom help and the dat file later on..

edit. phantom help link DJI Flight Log Viewer - PhantomHelp.com
dat file 2023-05-19_09-32-23_FLY102[1].DAT

Yorkshire_Pud · May 19, 2023

Oh that's a pity neither my CsvView nor my DatCom seem able to successfully process the DAT, ho hum.

xrider · May 20, 2023

flew in smode and happened the opposite thing starting at 00.16.. uncommanded altitude drop.. really dont know what to think..

DJI Flight Log Viewer - PhantomHelp.com

Yorkshire_Pud · May 20, 2023

The drop really starts around 00:43.

I wonder if @slup or @sar104 can dig anything out?
~~What about the DAT ?~~
D'oh, Homer moment big time, forgot the DAT is unreadable, sorry about that.

xrider · May 21, 2023

Yorkshire_Pud said:
The drop really starts around 00:43.

I wonder if @slup or @sar104 can dig anything out?
What about the DAT ?

the .dat file DJI_Mavic_3_Classic_2023-05-21_20-14-07.DAT

Yorkshire_Pud · May 21, 2023

Its downloading but the date and timestamp are wrong, the log in post #13 has the stamp 2023-05-20_[13-46-37].............
but that doesn't matter, I had a brainless moment and forgot the DAT from the M3c is unreadable, sorry about that.

xrider · May 21, 2023

Yorkshire_Pud said:
Its downloading but the date and timestamp are wrong, the log in post #13 has the stamp 2023-05-20_[13-46-37].............
but that doesn't matter, I had a brainless moment and forgot the DAT from the M3c is unreadable, sorry about that.

first .dat is the flight with uncommanded altitude gain and its from the dji rc.. second .dat its from the mavic and its with the uncommanded altitude drop.. dont know why .dat saved on my pc with the todays date but its the latest flight performed yesteday noon..

give it a try with datcon.. i can see the .csv and event stream but cant understand the cause of the gains and drops in altitude as it wasnt "thinking" that there was some kind of obstacle.. and really need some help of the experts here..

Yorkshire_Pud · May 21, 2023

xrider said:
first .dat is the flight with uncommanded altitude gain and its from the dji rc.. second .dat its from the mavic and its with the uncommanded altitude drop.. dont know why .dat saved on my pc with the todays date but its the latest flight performed yesteday noon..

I meant it was a mistake for me to ask you for the second DAT, it looks like the Mavic 3C DAT's are encrypted or unreadable.