[time-nuts] Clock quality: alternatives to ADEV
djl at montana.com
Thu Apr 10 05:37:17 UTC 2014
Tou can try some chaos analysis on the phase space (not the phase of the
signal). It may be that some kinds of shifts are chaotic.
> I've been watching the discussions and graphs for a while. ADEV seems
> appropriate for cases where the noise pattern is "nice". How does ADEV work
> if the noise isn't nice? Are there alternatives? What's the mathematical
> term for the type of noise that works well with ADEV?
> I can think of 3 examples:
> Crystal jumps
> GPSDOs going into holdover.
> Power lines make all sorts of interesting not-quite jumps.
> Is there a way of characterizing that sort of event? How do I turn a pile of
> data into a useful graph or chart?
> What does an ADEV graph look like if the data has crystal jumps?
> I'd expect that something like crystal jumps would follow some sort of power
> law: the bigger jumps would be less frequent. But it wouldn't surprise me if
> the GPS or power lines had an underlying mechanism that turned into a
> different pattern.
> These are my opinions. I hate spam.
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