[time-nuts] Predicting clock stability from the variouscharacterizationmethods]

Tom Van Baak tvb at leapsecond.com
Thu Nov 30 17:28:42 EST 2006


John,

A few minutes in paint and here's a cool graphic
for you:

http://www.leapsecond.com/pages/adev/adev-ani.gif

Frame 1) shows a generic phase record (black);
ignore all units.

Frame 2) shows taking a phase measurement at
regular intervals (red).

Frame 3) shows that frequency is calculated from
adjacent phase points (green). The slope (phase
rise over interval run) is the frequency.

Frame 4) you can predict clock behavior based on
most recent phase and frequency (extrapolated
phase in blue).

Frame 5) and on the next measurement interval you
can see how close your predictions were (prediction
errors in red).

You can go through individual frames at:

http://www.leapsecond.com/pages/adev/

Enjoy.

/tvb




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