> 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-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von Jim Lux > Gesendet: Samstag, 8. Oktober 2011 16:45 > An: time-nuts@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. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
