[time-nuts] Measuring short term stability minus linear drift

[Ulrich Bangert]

> 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...

...and with frequency being the first derivative of phase use a least
squares quadratic fit for phase data! Easily done with the tools that John
has mentioned.

Best regards
Ulrich

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Jim Lux
> Gesendet: Samstag, 8. Oktober 2011 16:45
> An: time-nuts at febo.com
> Betreff: [?? Probable Spam] Re: [time-nuts] Measuring short 
> term stability minus linear drift
> 
> 
> 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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