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First Look at Kepler SETI Candidate Signals
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![]() ![]() Send message Joined: 1 Mar 99 Posts: 1444 Credit: 957,058 RAC: 0 ![]() |
Check out our First Look at Kepler SETI Candidate Signals - No ET yet. -- BOINC/SETI@home network/web/science/development person -- "Any idiot can have a good idea. What is hard is to do it." - Jeanne-Claude |
![]() ![]() Send message Joined: 21 Apr 04 Posts: 3252 Credit: 31,903,643 RAC: 0 ![]() |
Check out our First Look at Kepler SETI Candidate Signals - No ET yet. Thank you for the information, signals do have a small, (~10KHz?) bandwidth, so this could be a 'transmitter', not a planet or cooled down star? ![]() |
![]() ![]() Send message Joined: 4 Oct 00 Posts: 9541 Credit: 50,759,529 RAC: 60 ![]() ![]() |
I think the article explained fairly well that natural sources don't tend to have narrow band sources. These signals look similar to what we think might be produced from an extraterrestrial technology. They are narrow in frequency, much narrower than would be produced by any known astrophysical phenomena, and they drift in frequency with time, as we would expect because of the doppler effect imposed by the relative motion of the transmitter and the receiving radio telescope. I assume this is where the v7 Wu's are going to take us. ![]() In a rich man's house there is no place to spit but his face. Diogenes Of Sinope |
![]() Send message Joined: 23 Jul 00 Posts: 67 Credit: 61,429,161 RAC: 27 ![]() ![]() |
Eric, While I anxiously await further information from additional analysis on these signals, the immediate question I have to ask is, what are "v7 WUs?" I'm also confused as to the dopler effect causing drift. As I understand it, if the distance between the transmitter and receiver are increasing or decreasing at a fixed rate, there would be doppler "shift", and not a drift. If I understand the pyhysics correctly, (and I am not a physics type at all) a frequency drift would indicate that the distance between the transmitter and receiver was not changing at a fixed rate, but at an increasing or decreasing rate. If I'm reading the charts correctly, it would appear that the speed at which the transmitter is travelling away from earth (relative to earth) is increasing over time. Kinda like what I would expect to see from the Voyager deep space probe as it leaves our solar system with a gravitational slingshot into deep space. Some clarification explaining why there is a frequency drift vs. shift would be appreaciated in your deeper analysis post. Obviously, I'm not as educated as well as others in these matters and welcome the opportunity to understand. Thanks. -Carl |
![]() Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 ![]() |
Looking at the plots I found them resembling the "waterfall" plots given in a demo of OpenSonATA at www.setiquest.org. But those were signals emanating by the Voyager spacecrafts, if I remember well, not by Kepler sources. I sometimes find it difficult to grasp the difference between each SETI effort... Tullio |
![]() ![]() Send message Joined: 4 Oct 00 Posts: 9541 Credit: 50,759,529 RAC: 60 ![]() ![]() |
Eric, V7 are the new WU's that are being tested on seti beta. if you need an explanation about the drift and gaussians see this page ![]() In a rich man's house there is no place to spit but his face. Diogenes Of Sinope |
![]() Send message Joined: 12 Aug 05 Posts: 258 Credit: 100,548 RAC: 0 ![]() |
i am french ^^ KID 4139816 KOI-812 (3 planets) RA 19h 04m 18.99s, Dec 39d 16m 41.95s -------------------------------------- KID 4725681 KOI-817 (1 planet) RA 18h 55m 27.93s Dec 39d 53m 53.09s ---------------------------------------- ![]() SETI@Home Informational message -9 result_overflow with a general handicap of 80% and it makes much d' efforts for the community and s' expimer, thank you d' to be understanding. |
Eric Korpela ![]() Send message Joined: 3 Apr 99 Posts: 1382 Credit: 54,506,847 RAC: 60 ![]() ![]() |
Hi Carl, I think you already got an answer to what v7 is, so I'll try to answer your Doppler drift question. It turns out signals we detect from space don't have a constant relative velocity, but have a changing velocity. That's because the receiver (and possibly the transmitter) are in accelerated motion. That's due primarily due to the rotation and orbital motions of the Earth and the transmitter or the planet that it's on. ET could, of course, correct for the motions of its own transmitter, but unless they knew the orbital and rotational speed and the location of our receiver on the Earth, they couldn't correct for that. As an aside, since the same narrow band features are seen on and off source, it's certain that they are RFI. Eric @SETIEric@qoto.org (Mastodon) ![]() |
Eric Korpela ![]() Send message Joined: 3 Apr 99 Posts: 1382 Credit: 54,506,847 RAC: 60 ![]() ![]() |
This was the first run of a pipeline that uses incoherent dechirping and is therefore less sensitive than SETI@home, but fast enough to run locally. A student is working on writing a splitter that will turn the Green Bank data into SETI@home workunits. I'll try to get you an ETA on that after the science meeting on Wednesday. We haven't decided whether a separate application will be required for processing these workunits. I'm hoping not. @SETIEric@qoto.org (Mastodon) ![]() |
Eric Korpela ![]() Send message Joined: 3 Apr 99 Posts: 1382 Credit: 54,506,847 RAC: 60 ![]() ![]() |
Typically such transmissions are corrected by the transmitter for the rotation of the earth and any orbital acceleration. Since those are known accelerations a fairly simple program or digital circuit does the job. @SETIEric@qoto.org (Mastodon) ![]() |
musicplayer Send message Joined: 17 May 10 Posts: 2442 Credit: 926,046 RAC: 0 |
What is a signal curve? |
musicplayer Send message Joined: 17 May 10 Posts: 2442 Credit: 926,046 RAC: 0 |
Continuing. Too late to edit the previous post. http://seticlassic.ssl.berkeley.edu/Candidates/SHGb15+17a/gaussian_profiles.html Just an example. But is the possible information contained in the best-fitting Gaussian curve (green), or the data (blue) ? |
![]() Send message Joined: 30 Nov 08 Posts: 39 Credit: 345,992 RAC: 0 ![]() |
Hi there, Im a newbie on this things of signals etc ... Ive readed http://www.planetary.org/explore/topics/search_for_life/seti/alien_signal.html ( Amir Alexander and Eric Heien Article ), that is very cool by the way, but it still rest a question for me. If we see that gaussian signals what we do? A print screen ? ( if print screen works with screensaver .... ive never tested ) or record that? i dont see how to record that if we need to click on somewhere to start recording, and like that bye bye screensaver .... Sorry for my bad english ( im Portuguese ) and for my very very newbie question but well ... im learning and i love this subject :-) |
David S ![]() Send message Joined: 4 Oct 99 Posts: 18352 Credit: 27,761,924 RAC: 12 ![]() ![]() |
Hi there, Hi, You don't need to record anything. You don't even need to run the screensaver if you don't want to. The software will make note of the gaussian(s) and whatever else it finds and return the note to the lab. Eventually (and I have no idea if this is ongoing or all the data is just sitting there, waiting for someone to look at it) all the things that have been noted will be analyzed to see if they are really anything or just random noise. Someone else can probably explain this better than I. I'll offer you one English lesson. The past tense of the verb "read" (pronounced reed) is "read" (pronounced red). I know, this is very confusing, and a lot of people who have spoken English all their lives don't get it right either. David Sitting on my butt while others boldly go, Waiting for a message from a small furry creature from Alpha Centauri. |
Christoph Send message Joined: 21 Apr 03 Posts: 76 Credit: 355,173 RAC: 0 ![]() |
Have a look for NITPCKR. It is a program to check the database for candidates. It is only running sporadic right now because the project is lagging a suitable machine for this purpose. Christoph Christoph |
![]() Send message Joined: 30 Nov 08 Posts: 39 Credit: 345,992 RAC: 0 ![]() |
Hi, Hi N9JFE, Thanks for the feedback, and also thanks for the english lesson ! For me the "sound" of "Readed" it was good and cool, is for that ive wrote "readed". i dont have liked the sound of "read" on past tense ... dont know why ... but well ... thanks for the lesson :-) Now i know ! So ... resuming, today i dont have time to do that but in the next days i think yes ... can you please Christophe talking about that machine you need? Or the project ? Maybe we found one .... or maybe not :-) ... Who knows? Thanks also for the little explanation of the " Labs Side" N9JFE. Im gonna read a little more dont know where but well ... im gonna read .... Cheers ! |
![]() Send message Joined: 10 Jan 12 Posts: 1 Credit: 84,076 RAC: 0 ![]() |
If a signal was detected, would they tell us?... seriously... EH |
musicplayer Send message Joined: 17 May 10 Posts: 2442 Credit: 926,046 RAC: 0 |
What Sten-Arne is mentioning here I have probably have seen earlier on as well. Anyway, shouldn't we be looking for digital signals, not analog ones, meaning that the definition narrowband signal becomes obsolete and having no meaning at all? Our own systems are going digital, television sets dealing with frequencies are being replaced by pre-programmed digital tuners. Also DAB or digital radio will soon be launched here, replacing an awkward system that is currently in existence. Mobile phones have preset frequencies, making its users unable to scan the mobile net like you are able to do with existing radio tuners. Soon you will probably not be able to tune between stations either. |
Christoph Send message Joined: 21 Apr 03 Posts: 76 Credit: 355,173 RAC: 0 ![]() |
@ Ricardo Lourenco (Neo) Well have a look at http://www.gpuug.org/. This organisation was founded by SETI@home volunteers like you and me and it's purpose is to help the SETI@home staff with handling of donations. There are currently 5674 dollars missing to purchase that dedicated NTPCKR machine. And 460 for hard disk drives for their new storage server. Also have a look at Numer Crunchin forum, GPU Users Group Fundraiser: Hardware Donations for S@H. If you can spare some money, even only 5 or 10 dollars, it helps. Christoph P.S.: Going to do a donation myself now. Christoph |
![]() ![]() ![]() ![]() Send message Joined: 20 Jun 99 Posts: 6659 Credit: 121,090,076 RAC: 0 ![]() |
What Sten-Arne is mentioning here I have probably have seen earlier on as well. As far as I know digital signals won't transmit anywhere near as far as analog. Once a digital signal starts to pixelate, is degrades quickly with information being lost. Quite a lot can be gleamed from an analog signal which keeps all of the information over long distances, as our computers are doing just that. Steve Warning, addicted to SETI crunching! Crunching as a member of GPU Users Group. GPUUG Website |
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