Discussion
Micro-electromechanical sensors are free from bias and drift. True or false?
Answer: C
Correct answer: False, their bias is larger than inertial grade sensors
The statement is false. Micro-electromechanical sensors have larger bias and poorer bias stability than ring laser, fibre optic or other inertial-grade devices, and they are more sensitive to temperature, not less. Their appeal is size, cost and ruggedness, not accuracy.
Having no moving parts removes mechanical wear but not drift, which arises from the electronics and from the temperature dependence of the silicon structure. Stable temperature reduces the drift but does not eliminate it, which is why the filter estimates the bias continuously rather than relying on a fixed calibration.
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