Linear Response
While Allan variance is intended to be used to distinguish noise forms, it will depend on some but not all linear responses to time. They are given in the table:
| Linear effect | time response | frequency response | Allan variance | Allan deviation |
|---|---|---|---|---|
| phase offset | ||||
| frequency offset | ||||
| linear drift |
Thus, linear drift will contribute to output result. When measuring a real system, the linear drift or other drift mechanism may need to be estimated and removed from the time-series prior to calculating the Allan variance.
Read more about this topic: Allan Variance
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