[time-nuts] Clock quality: alternatives to ADEV

Don Latham djl at montana.com
Thu Apr 10 01:37:17 EDT 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.
Hal Murray
> 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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"The power of accurate observation is commonly called cynicism by those who
have not got it."
 -George Bernard Shaw

Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
Huson, MT, 59846
mail:  POBox 404
Frenchtown MT 59834-0404
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