[time-nuts] How to measure Allan Deviation?

Tom Van Baak tvb at leapsecond.com
Tue Oct 24 06:03:03 UTC 2006


> Both links are great, thank you. Particularly, the 2nd one links to a 
> program to isolate the noise of 3 oscillators from 3 pairs of 
> comparisons. That's what I was looking for. Too bad the source code is 
> not provided, but if the program works, that'll be fine.

The 3-cornered hat code looks something like this:

A[i] = SQRT( (0 + SQR(AB[i]) - SQR(BC[i]) + SQR(AC[i])) / 2.0 );
B[i] = SQRT( (0 + SQR(AB[i]) + SQR(BC[i]) - SQR(AC[i])) / 2.0 );
C[i] = SQRT( (0 - SQR(AB[i]) + SQR(BC[i]) + SQR(AC[i])) / 2.0 );

The above source is from:
http://www.leapsecond.com/tools/3hat.htm

If you are a programmer see also this ADEV code:
http://www.leapsecond.com/tools/adev1.htm

/tvb





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