Allan Variance - Linear Response

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:

Allan variance linear response
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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