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Implications of dual IMU and Compasses..

Lewberry6

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On reading a recent post on here about a members Mavic crashing into a lake due to what appeared to be a malfunctioning IMU gave me a thought. Are dual redundant sensors really that much of a safety increase? My thinking is that other than a complete failure would sensors not need to work in 3’s so that the malfunctioning/ incorrect reading sensor could be identified from the other 2 readings? Otherwise how does the drone pick what sensor is giving the correct input?

I guess software could eliminate a sporadic reading from ta solid one but in the case of the post I read the IMU was producing a constant reading of increasing height which resulted in a crash to the ground...

Just wondering your thoughts or if I’m missing anything (I’m not an engineer or computer scientists ha)
 
A little aka it's better than just one, but not not massive indeed as it only covers a few fault scenarios as you pointed out.
 
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