Hi Sylvain,
On 08/02/2012 11:24 PM, Sylvain Munaut wrote:
Hi Magnus,
Thanks a lot for the concise and very clean explanation.
You are welcome!
The cross-correlation part between the two signal was clear enough in
my head but I didn't really see how it would achieve much gain. I
didn't think about averaging many resulting spectrum while they're
still complex (and not just the amplitudes ... ). I assume that the
cross correlation of the two measurement makes the phase of several
consecutive measurement "align" so that the main signal accumulates
over many averages while the noise is just averaged out.
Because they correlate, they add up, because the noise does not
correlate, it flattens out.
You should look up what is written by NIST on this technique. They have
a nice online archive.
They also demoed it on the NIST seminar.
Cheers,
Magnus
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