Allan deviation matlab

1. How do you calculate Allan deviation?
2. How do you interpret Allan deviation?
3. How to find variance in matlab?

How do you calculate Allan deviation?

Standard deviation is the square root of variance. So to get Allan deviation from Allan variance, we just take the square root of every variance measure we calculated above.

How do you interpret Allan deviation?

An Allan deviation of 1.3×10−9 at observation time 1 s (i.e. τ = 1 s) should be interpreted as there being an instability in frequency between two observations a second apart with a relative root mean square (RMS) value of 1.3×10−9. For a 10-MHz clock, this would be equivalent to 13 mHz RMS movement.

How to find variance in matlab?

y = var( X , W ) computes the variance using the weight vector W . The length of W must equal the length of the dimension over which var operates, and its elements must be nonnegative. var normalizes W to sum to 1 . Use a value of 0 for W to use the default normalization by N – 1 , or use a value of 1 to use N .