Time deviation (TDEV), also known as σ x ( τ ) {\displaystyle \sigma _{x}(\tau )} , measures the time stability of a clock source's phase over an observation interval, expressed as a standard deviation of the time variations. This indicates the time instability of the signal source.
Time deviation (TDEV), also known as σ x ( τ ) {\displaystyle \sigma _{x}(\tau )} , measures the time stability of a clock source's phase over an observation interval, expressed as a standard deviation of the time variations. This indicates the time instability of the signal source.
Source: Wikipedia "Time deviation" · CC BY-SA 4.0
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