Which bias source can drift with temperature?

• A. Vibration.
• B. Only bias drift.
• C. No effect of temperature.
• D. Temperature dependence.

Answer: (D)

Biases in sensors often depend on temperature; the offset value can change as temperature varies. This temperature dependence means the bias drifts when the device experiences temperature changes, often following a roughly linear relation with temperature. In practice, MEMS and other sensors have a temperature coefficient that must be calibrated or compensated for in the navigation system. Vibration can cause errors, but it's not inherently tied to temperature in the same systematic way. Saying there’s no effect of temperature contradicts real sensor behavior, and simply stating “bias drift” without naming the mechanism doesn’t explain why it drifts. The characteristic that explains drift with environmental change is temperature dependence.