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Old 03-12-2016, 10:15 PM
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Shiraz (Ray)
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Shiraz is offline
Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,833
just tested another dataset with 16 very similar dithered, calibrated and aligned subs. the noise in a few subs chosen at random varied from 4.55 to 5.5 with a mean of about 5. A stack without any rejection produced a noise level of 1.24, which is almost exactly 1/4 of the average sub noise levels - as it should be for 16 subs. I am not seeing any gain at all over the expected sqrt(n).

ie, I get Stacknoise = Subnoise/sqrt(n)

A stack of the unaligned subs had noise about 25% higher than that from the aligned stack - assume that this indicates some residual FPN.

Last edited by Shiraz; 04-12-2016 at 08:15 AM.
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