Here is python code for the most common deviations https://github.com/aewallin/allantools/blob/master/allantools/allantools.py
each statistic (ADEV, MDEV, TDEV, and so on) has two functions. one takes fractional frequency data, the other phase data. frequency2phase() and phase2freqeuncy() show how the conversions are done. Your patches are welcome! Anders On Sat, Mar 1, 2014 at 1:37 PM, Tom Van Baak <t...@leapsecond.com> wrote: > Hi Volker, > > Either phase or frequency raw data can be used to generate an ADEV plot, > but you have to use different methods depending on the data type. > > See the two formulas for Allan Variance in: > http://www.wriley.com/paper2ht.htm > > Usually we use the "x" form of the formula, where x is an array of phase > samples. But if you have frequency samples then use the "y" form instead, > where y is an array of frequency samples. > > Note you can also convert phase data to frequency data (by > differentiating) and use the "y" form. Or convert frequency data to phase > data (by integrating) and use the "x" form. > > /tvb > > ----- Original Message ----- > From: "Volker Esper" <ail...@t-online.de> > To: "Discussion of precise time and frequency measurement" < > time-nuts@febo.com> > Sent: Saturday, March 01, 2014 3:15 AM > Subject: [time-nuts] ADEV from phase or frequency measurement > > > > Hello dear fellow time-nuts, > > > > I stumbled over a question that may sound stupid to you: > > > > Is the usual ADEV plot the result of a phase or a frequency measurement? > > > > I get totally different results when comparing a phase and a frequency > > measurement of the same source. Or am I doing something totally wrong? > > > > Thanks a lot > > > > Volker > > > _______________________________________________ > 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.
