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Old 01-12-2016, 04:50 PM
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Shiraz (Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,797
that is spot on Mark.

The spreadsheet does not include fixed pattern noise. I assumed that it can be managed with proper processes (eg dithering and accurate calibration). However, you are right that the SNR predictions are "best possible" - they will be reduced if FPN is not managed. I will put in a comment to that effect.

My understanding is that the FPN does not actually build up - rather it does not reduce with integration like random noise does. If the same noise pattern is imprinted in all of the subs, it will be there in the stack as well. dither turns FPN into random noise and then longer integration can reduce that noise as well.

thanks very much for taking the time to test the spreadsheet.

regards Ray

Last edited by Shiraz; 01-12-2016 at 09:23 PM.
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