[time-nuts] Clock quality: alternatives to ADEV
hmurray at megapathdsl.net
Wed Apr 9 18:38:43 EDT 2014
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:
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
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