Message boards :
Number crunching :
How long did it take to generate the tasks we process?
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Lord Nick Of Austin Send message Joined: 12 Apr 13 Posts: 1 Credit: 12,081,962 RAC: 0 |
I am curious how long it takes to process the data vs how long it to be acquired. Obviously I know the processing time varies by computers but does each task represent a certain amount of radio time? |
Gary Charpentier Send message Joined: 25 Dec 00 Posts: 30608 Credit: 53,134,872 RAC: 32 |
I am curious how long it takes to process the data vs how long it to be acquired. Obviously I know the processing time varies by computers but does each task represent a certain amount of radio time? A good read http://seticlassic.ssl.berkeley.edu/about_seti/about_seti_at_home_1.html About 107 seconds per work unit. |
Josef W. Segur Send message Joined: 30 Oct 99 Posts: 4504 Credit: 1,414,761 RAC: 0 |
To be exact, SETI@home tasks so far have been 1048576 samples at 9765.625 samples per second, so 107.3741824 seconds in duration. Astropulse tasks so far have been 33554432 samples at the full 2.5 million per second recorded sample rate, so are 13.4217728 seconds of recorded time. When GBT data comes along those can be expected to change. A new recorder at Arecibo might also change the characteristics of data from there. FWIW, the 50.2 GB "tape" files which the splitters take as input contain just about 1.5 hours of recorded data. With 14 channels of recorded data, each file produces about 225792 SETI@home WUs and 5600 Astropulse WUs. Each WU of course turns into at least two tasks. Joe |
Fred J. Verster Send message Joined: 21 Apr 04 Posts: 3252 Credit: 31,903,643 RAC: 0 |
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Josef W. Segur Send message Joined: 30 Oct 99 Posts: 4504 Credit: 1,414,761 RAC: 0 |
Is "AstroPulse" signal search done with greater resolution or sensitivity, since Astropulse is better at detecting the broadband pulse signals it is designed for, SETI@home is better for narrowband. There is an overlap between SETI@home pulse finding and Astropulse repetitive pulse finding, which one would be better for rates they can both detect would depend on the specific characteristics of the signals. The Multibeam Recorder at Arecibo downconverts the frequency range 1418.75 MHz. to 1421.25 MHz. from the ALFA receiver system to baseband, then detects and records I (inphase) and Q (quadrature) outputs for each channel. We're not trying to discern specific modulation types other than on/off for spikes, pulses, and triplets. If a persistent signal is found, of course many observations will be made to gather additional detail. Joe |
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