Re: Update on LIGO.

On a sunny day (Thu, 17 Jan 2008 11:33:53 -0800 (PST)) it happened Randy Poe
<poespam-trap@xxxxxxxxx> wrote in
<c2ffc0cf-4bd3-4c7b-917e-082078b1feb2@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

On Jan 17, 2:10 pm, Jan Panteltje <pNaonStpealm...@xxxxxxxxx> wrote:
On a sunny day (Thu, 17 Jan 2008 18:50:24 GMT) it happened Sam Wormley
<sworml...@xxxxxxxxx> wrote in <QrNjj.304076$Fc.5875@attbi_s21>:

GPS Satellite signals are buried in the noise!

Not really

Not a problem!

Oh yes it can be

Correlation!

Bull***.

Use grey matter for a moment, (hire or buy some if needed):
'They' are looking for a signal that they have no clue what frequency,
science is not 100% sure about even the supposed propagation speed,
AND IT IS NOT PERIODIC, IT ARE ONE TIME EVENTS,

'Correlation' is the direct enemy of bandwidth, in a way.

Like Seti, you can look at noise for ever, end even detect wonderful things
(nature of infinite random is that anything will happen),
but it will have no value.
And if you correlated anyways, you likely did mean auto-correlation:
http://en.wikipedia.org/wiki/Autocorrelation

and if not try reading this:
http://en.wikipedia.org/wiki/Correlation

'correlation' proves NOTHING.

More to the point:

http://ccrma.stanford.edu/~jos/sasp/Processing_Gain.html

Coherent integration increases SNR, helps you pull
signals out that are buried in noise.

Yes, and it says this:
<quote>
Each halving of the low-pass cut-off frequency adds another 3 dB to the
SNR. Since the signal is a dc component (zero bandwidth), this process can
be repeated indefinitely to achieve any desired SNR. The narrower the
lowpass filter, the higher the SNR. Similarly, for sinusoids, the narrower
the bandpass filter centered on the sinusoid's frequency, the higher the
SNR.
<end quote>

Now here are 2 problems with gravity waves:
1) they are not DC,
2) the exact frequency is an unknown (depends on the event)
Now I hope that it is clear to even so called mathematician Wormley that the wider
the bandwidth (the bigger the range over which you look for 'events') the worse
the SNR will be.

In fact they really do not even know the frequency of those signals, they cannot.
So they are looking for some idea of some brain fart, and if bandwidth is
made big enough, one day they will see someting that is actually noise but
looks a lot like what they want to see, and then let's hope not just some
flash happened at the same time.
That is, to prevent that horrible error, why LIGO should be nuked.
.

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