[SciPy-user] Phase Unwrapping Algorithm
Thu Mar 8 16:28:57 CST 2007
On 08/03/07, Jared Peacock <firstname.lastname@example.org> wrote:
> Does anybody know of a good phase unwrapping algorithm in Python?
If by phase unwrapping you mean taking values that have been reduced
modulo 1 (say) and trying to reconstitute the originals, the problem
is in principle underdetermined - we really can't distinguish big
jumps in the data from the results of phase wrapping. Still, for
reasonable data it's often enough to consider every jump bigger than
0.5 a phase wrap:
That is, a[1:]-a[:-1] extracts the first difference, round converts
anything less than -0.5 to -1 and anything more than 0,5 to 1, we
concatenate a zero on the front, and then we subtract (because a jump
down of 0.6 is rounded to -1 and we want it to be a jump up) the
result from our original data.
I suppose this could be made more efficient by rewriting more of the
operations to be in-place.
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