Discussion
Assertion (A): Micro-electromechanical sensors are used in light aircraft attitude systems.
Reason (R): They are small, cheap and rugged, though their bias is larger than inertial grade sensors.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the assertion. Micro-electromechanical sensors are used in light aircraft attitude systems because they are small, cheap and rugged, being etched from silicon in volume, and that combination is what makes an affordable attitude and heading reference system possible at all in that market.
The larger bias is the accepted cost. It matters less for attitude than it would for navigation, because the gravity and magnetic references bound the error, whereas a position solution would have nothing to hold the same bias in check.
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