Re: MEMS gyro: offset drift

On Oct 24, 8:51 am, Marco Trapanese <marcotrapaneseNOS...@xxxxxxxxx>
wrote:
Vladimir Vassilevsky wrote:
Yes, the MEMS accuracy is limited by the zero drift. You can pick the
best parts from a pile and run those parts through the temperature
offset calibration. This can improve the accuracy by several times,
however nobody knows for how long this calibration will stay valid.
Also, the MEMS calibration is invalidated by a mechanical or thermal
stress.

Ok.

So, the rotation with the constant speed will not be noticed at all.

Fortunately, the target rarely rotates at constant speed. It's a
tradeoff, I know.

Perhaps they reset zero every time the heli is on the ground.

And how do they know the heli is on the ground? Better, how do they know
the "ground" doesn't rotate? Imagine you are on a rotating platform: if
they do such a reset the heli won't fly straight!

Marco / iw2nzm

Sounds like your control system is all to pot. You need a Kalman
filter and state feedback as any 12 year old nowadays will tell you!

Hardy

.