Allan variance accelerometer

1. How do you calculate Allan variance?
2. What is Allan variance and how is it used?
3. How do you measure Allan deviation?
4. What is in run bias stability?

How do you calculate Allan variance?

Interpretation of value

Allan variance is defined as one half of the time average of the squares of the differences between successive readings of the frequency deviation sampled over the sampling period.

What is Allan variance and how is it used?

Allan variance is a statistical analysis tool for identifying various noise types that exist in a signal. Developed in the mid-1960s, the Allan variance was used to measure the frequency stability of precision oscillators. Later, this technique was applied to other areas as well.

How do you measure Allan deviation?

The beat frequency method is the standard method to measure Allan variance, or more precisely to measure the frequency deviation of the DUT from the frequency standard. The total power at the respective offset frequency is read from the spectrum analyzer display.

What is in run bias stability?

The in-run bias stability, or often called the bias instability, is a measure of how the bias will drift during operation over time at a constant temperature. This parameter also represents the best possible accuracy with which a sensor's bias can be estimated.