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Value of Autocorrelation?
Autocorrelation is a measure of a signal's self similarity. It is a powerful DSP technique and it seems like it might be very useful in the setiQuest mission. I'm curious what peoples thoughts and experiences with Autocorrelation are?
I recently added some Autocorrelation images and a movie to the baudline Exo4 blog post that is being discussed here:
http://setiquest.org/forum/topic/baudline-analysis-kepler-exoplanet-4
Is Autocorrelation a useful tool in blind searches? Is it helpful in detecting patterns and determining informational content? Or does it just obfuscate the search?
Autocorrelation is a very useful tool for detecting wide-band signals. SETI projects have not searched extensively for wide-band signals.
A good test signal of this class is GPS which spreads its 1575.42 MHz carrier over a few MHz bandwidth using a unique pseudo-random sequence for each satellite that repeats on a 1ms interval.
We will post a GPS signal.
Rob, a GPS signal would be a nice thing to play with!, thanks.
Also, it is possible to have a pulsar signal? Maybe the autocorrelation can show something there? I've never seen the spectrum of a pulsar, but I suppose that it's like modulated white noise, with short pulses of noise.
Thanks!
Yeah, a GPS and a pulsar signal would be great to look at.
I've read that the rotations of some pulsars are so complex that they can be described with grammars. Let's just hope it doesn't look like a FSK signal with a drifting random walk. (:
Context for the drifting FSK reference: http://setiquest.org/forum/topic/baudline-analysis-kepler-exoplanet-4
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