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Strange Gains and Drops
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1390 74 2020-2-3
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hallmark007
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We have recently seen some strange things happening with altitude involuntary gains and Drops, so why is it happening.

Many logs have been looked at, many different theories regarding strange cold weather fog etc

How does a drone hold its altitude, VPS is one and Barometre is the other, we know that drops and gains are also happening outside VPS range so can probably exclude that, so we have Barometre, barometres in the IMU are what helps the drone maintain its altitude , so it stands to reason that they either are not working as they should or something is preventing them from working.

Dji have through moderators come out and said make sure your on latest FW "and calibrate IMU" for me this is correct thing to do if there's any problem with barometres or IMU.

Some have said it's due to IMU getting to cold again this would point to possible problem with barometres, equally if they get condensation or wet and are not correctly insulated this can cause problems with drops and gains.

Many moons ago building drones , not insulating barometres and IMU caused our X copters to both lose and gain altitude, the Mavic mini is unusual for a dji drone in that it has a lot of vents and not just vents but very open vents, compared to other dji drones like Mavic2 Mavic1 Mavic Air . So greater possibility of weather encroaching on the inside of the drone.

Simple things like taking drone from a cool environment to warm can cause build up of condensation, leaving your drone in the boot of the car over night can cause its temperature to drop so it might be 2" degrees outside but still cooler in the boot of your car.

I have tested in cold weather -4 and I did report here that I had drops and gains flying the drone, I presumed at that time it was just straight to cold IMU, but my thinking now is this maybe something to do with barometres not being shielded enough, whether it's in all drones, I really don't think so, but it could be affecting some.

I would recommend that proper calibration of IMU in a cool area or IMU cooled down gimbal calibration in case IMU calibration causes tilted horizon and make sure your on up to date FW.

My only reasoning for this is simple, craft maintains its present altitude because of barometres, crafts are NOT maintaining their altitude, so it stands to reason that barometres are not doing their job . WHY ? It could be IMU also for similar reasons .

I hope it's a simple fix through bug fix in FW .
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