I want to measure the short term stability of a source
with substantial linear drift. I would like some measure
of stability along the lines of Allan deviation, but I
only want to measure the "noise" and ignore the "drift".
AFAIK, ADEV treats linear drift like a form of noise.
Has this problem been solved before?
Any ideas?
Rick Karlquist
Right, ADEV will suffer with linear drift.
Plot the frequency first to see how linear the drift is. If it
looks like you expect (that is, mostly a straight line) then
it's safe to remove it from the raw data with a quadratic
least squares fit. Then compute ADEV on the residuals.
Another way it to use HDEV on the raw data.
Let me know if you want the command line tools I use
for all this.
The other suggestion is to use John Miles' TimeLab.
/tvb
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