What Would a "Hit" Look Like

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Dr. Larry L. Burriss

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Message 1924521 - Posted: 14 Mar 2018, 16:46:08 UTC

I'm curious: what would a graphic representation of a "hit" or a "really, really interesting signal" look like?
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Michael Watson

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Message 1924525 - Posted: 14 Mar 2018, 17:06:45 UTC

What a 'hit'would look like would depend on the way the data was displayed. As a simple graph of frequency vs. amplitude it would probably look like a sharp, narrow peak, rising out of the scruff of noise.

In a 'waterfall' display, of frequency vs. time it's expected to be a distinct, straight line within a field of dots, due to noise. The line would presumably slant upward or downward somewhat, as its frequency was Doppler shifted by the relative motion of the Earth, and the source of the signal.
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Message 1924534 - Posted: 14 Mar 2018, 17:21:54 UTC

There is no way to say what a "hit" would look like because SETI doesn't look at a single sample (work unit) as being a "hit", but looks for several samples from the same "location" being of a similar nature. David Anderson & Eric Korpela have been working on the correlation process in the background under the "Nebula" heading - Read the latest posts from David Anderson in this thread (https://setiathome.berkeley.edu/forum_forum.php?id=1511) for the current status and a very top level description of the processes being employed. (I'm glad he's kept it as a superficial description as the maths gets well into nose bleed territory very rapidly...)
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acirocco149

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Message 1927404 - Posted: 31 Mar 2018, 0:01:04 UTC - in response to Message 1917129.  

Slightly related & pardon ignorance being new member again recently. How do I know or SETI@home know when a received data set is noteworthy? I have a dual MS in Telecom, etc. and good at patterns. I received data from Green Bank, WV and processed what I believe to be a noteworthy observation from program and thru visual observations. How would I know for sure, the data reaches the appropriate individuals, etc.? What is auto/manual processes and how much lag time for crunching results, etc.? ty in advance
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Message 1927465 - Posted: 31 Mar 2018, 8:06:48 UTC

All the "interesting" signals we detect are held in a very large database, which is used by David Anderson's Nebual process, which then looks for the even more interesting signals - the locations of these very interesting signals will then be subject to a more intensive probe using other telescopes.
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Message 1927508 - Posted: 31 Mar 2018, 14:38:14 UTC - in response to Message 1927465.  

I also saw data from Arecibo that resembles the signal from Green Bank in time, etc. I will reply on the wheels of progress to ascertain the road this leads too. I understand that Green Bank has uncovered about 15 hits since operation?
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Profile Matthew Baer

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Message 1928101 - Posted: 5 Apr 2018, 13:41:08 UTC - in response to Message 1927465.  
Last modified: 5 Apr 2018, 13:41:18 UTC

I'm curious as to how many "interesting" signals are found in a given month. Are they rare?
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Message 1928103 - Posted: 5 Apr 2018, 14:03:41 UTC

The database contains something around 16 million "pixels", and each pixel will have more than 1 set of data - which is why the next level of the sifting, called "Nebula", is such a complex and massive task.
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Message boards : SETI@home Science : What Would a "Hit" Look Like


 
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