hallmark007
Core User of DJI
Flight distance : 10186312 ft
Ireland
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Geo_Drone Posted at 6-14 03:50
IMU calibration is advised AFTER each FIRMWARE....is not my opinion, is the opinion of the ex-head of testing department that is now at Autel, Ken Booth...and I believe that the man that was running all testing department at DJI knows better the DJI drones than all "smart guys" here.
So...his words are:
First thats Rubbish, second Ken no longer works at Autel. It seems he believes they know nothing about drones and Im certain he’s right.
With your dji drone you have a Manual read it and tell me where it says calibrate IMU after Firmware or software update. Then tell me why you would calibrate a perfectly calibrated IMU. Surely if your compass or IMU are in perfect working order you cannot improve this by calibrating. What you’re suggesting is nothing but an urban myth which comes without any foundation except “in the old days this is what people did”
Ken Booth was a moderator on this forum just like dji Stephen except he was known as dji Ken and another dji Forum before making a huge mistake and leaving dji for Autel were he lasted less than a few months. He wasn’t running all djis testing department another myth. And if he is this GURU your making him out to be why is he not working now. You are once again spreading ridiculous myths without an iota of proof or even a reason why.
Read below:
IMU "Inertial measurement unit" .
As far as I see it, IMU calibration on a level surf as a reference for a level stationary hover. From there the craft responds predictably to flight commands. It also likely measures any sensor noise and thermal drift so that these technical imperfections are accounted for when using IMU sensor data in flight. - this is likely why there must be no vibrations during the calibration process.
Bad IMU calibration could cause drift and attitude issues as the flight controller fights to hold the craft in what it thinks is the correct attitude as opposed to the correct physical attitude.
The IMU usually has 2 types of sensors – angle and acceleration and in turn 3 sensors of each type measuring in the X,Y and Z axis. These sensors can, through vibration, aging, impact etc, drift in their response over time and thus an IMU calibration will establish a new reference for the IMU’s level/stationary state that the flight controller can work with to restore stable flight.
Think of calibration as the bringing back into line the measured craft attitude with the true physical craft attitude.
As to how often an IMU calibration is needed, Refer to your manual ; certainly after any impact or if there are suspicions the craft can’t hover in a level attitude in a windless environment. |
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