Ryan L GNC
New
United States
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All - It seems like there was a whole lot of confusion about the whole question of why a warming up process. My guess (I don't work at DJI) has to do with some of the fundamental workings of IMUs. A brief explanation/my thoughts (not to beat a dead horse or anything):
An IMU consists mainly of two parts: (1) accelerometers (tells you about how you're moving translationally through space), and (2) gyroscopes (tells you about how fast you're rotating). These sensors are physically imperfect and so there are errors associated with them (random walk, scale factors, misalignments, and biases). All of these errors, if not known and accounted for, are integrated (added up) over time and can produce really poor performance. Because of the way that these sensors are physically made, the sensors' temperature has an effect on how accurate the sensors are. I suspect that the warm up process is built into the calibration routine to help better estimate what all the scale factors, misalignments, and biases are as they rise to operating temperature so their effects can be effectively minimized during flight.
Hopefully that explanation better helps to understand the underlying issues and satisfies some curiosity.
As far as the whole sticking it in a freezer with or without a bag, I'd simply recommend being really careful - especially if you live in a humid place. The danger is from condensation collecting on the internal electronics. Water and electrical boards have not historically gotten along well excepting specific, intentional applications. ;)
-Ryan |
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