AP & MB & splitting

Message boards : Number crunching : AP & MB & splitting
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Profile petri33
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Message 1469975 - Posted: 28 Jan 2014, 21:27:12 UTC

How much common work is there for clients, when doing first an AP job and then several MB jobs from the data now split by the servers?

The data has to be converted to ones and minus ones, chirped (rotated), fft'd and dechirped (rebuilt), pulses must be searched, averages and powers calculated...

I'm wondering if it would be of any help for the project, if an AP data chunk, already preprocessed by (and sent to) the end user machine could be utilised as a source for any extra calculations needed by the MB work. The client preprocessed AP packet would produce multiple MB results requiring some additional (gaussFit, autocorr, ... work) - would it?

Though I might be totally wrong. This was just a thought that popped into my mind just before falling asleep. Had to write it down.
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Message 1470004 - Posted: 28 Jan 2014, 22:12:14 UTC - in response to Message 1469975.  
Last modified: 28 Jan 2014, 22:14:43 UTC

MB does doppler effect correction(narrow signal) while AP does dedispersion (wide freq range, narrow signal doesn't disperse). Both use freq domain for that but MB uses different freq width from 8 to 128k bins (how those bins translated into freq range in Hz is separate question) while AP uses fixed 32k FFT. Not much if any at all common parts. Also, AP blanking can ruin any similarities on FFT level if they would even exist.
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Message 1470278 - Posted: 29 Jan 2014, 14:57:40 UTC - in response to Message 1470004.  

OK, thanks.
To overcome Heisenbergs:
"You can't always get what you want / but if you try sometimes you just might find / you get what you need." -- Rolling Stones
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Message boards : Number crunching : AP & MB & splitting


 
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