>> Tom's (tvb) plot I referred to in a previous message is at >> >> http://www.leapsecond.com/pages/3gps/gps-adev-mdev.gif >> >> Sorry for the confusion. > > Phew, I was kind of worried there for a while. The ADEV plot showed three > straight parallel lines with no tendendency to converge. > > Interesting to (finally) see MDEV used for this analysis. > > Cheers, > Magnus
Me too. Using ADEV to look at the three receivers seemed like the obvious thing to do, but then Brooks suggested I look at MDEV instead and I was very surprised, and pleased, to see the result. It much better reflects what we all do with GPS receivers, something Tom Clark first popularized with his VP TAC a decade ago -- which is to time average the sawtooth away [ OK, for the purists: not to average away to zero, but to reduce it somewhat through short-term averaging ]. The other thing about the plot is that it show a nice real world example where using ADEV doesn't convey the right message at all; using MDEV is closer to the truth. /tvb _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
