allanvar() surprising behavior for large Tau

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Jacques Trichet
Jacques Trichet 2020-5-27
回答： Sean 2020-12-6
I compared Matlab build-in allanvar() funtion to script provided in NXP AN5087 and can see significant difference for Allan deviation at large tau.
This happens for very large data count, e.g. >1e7.
AN5087 is much closer to expected behavior: slope -1/2 then slope +1/2 !
So I would not recomend using allanvar() for very large datafiles !

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回答（1 个）

Sean
Sean 2020-12-6
I think I'm observing the same problem. It is easy to reproduce using the following code
[sigma,tau] = allanvar(rand([1,1e8]));
figure;loglog(tau,sigma,'.:')

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