[time-nuts] Measuring short term stability minus linear drift
Jim Lux
jimlux at earthlink.net
Sat Oct 8 14:45:24 UTC 2011
On 10/7/11 9:32 PM, Rick Karlquist wrote:
> 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?
>
what if you (least squares?) fit a straight line to the frequency
measurement data, remove that, then look at ADEV? We do something
similar with testing deep space transponders which will be handling a
signal with varying Doppler so our test signal is varying in frequency.
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