“The title says “How to...,” but doesn’t say how they plan to do it at all”
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I actually expected something people could do at home. Something along these lines:
https://www.universetoday.com/25560/the-switch-to-digital-switches-off-big-bang-tv-signal
http://www.chicagotribune.com/news/weather/ct-wea-asktom-1101-20171031-column.html
darn!
Luckily, it’s possible to learn something from the host of weaker signals that collectively form an unresolved background (Fig. 1). Think of listening to frogs croaking in a swamp: We can pick up clear songs from the nearest frogs, but we can also hear an indistinct hum from the thousands of frogs that are farther away. The volume of this background hum provides a measure of the frog population. Similarly, the amplitude of the unresolved background in LIGO and Virgo’s detectors can tell us about distant black hole mergers that occurred when the Universe was much younger.Source: https://physics.aps.org/articles/v11/36The traditional way to distinguish this gravitational-wave background signal from noise is to compare the outputs of two or more detectors with a so-called cross-correlation analysis. Noise is uncorrelated between detectors, so its contribution will average to zero in a cross-correlation, while any gravitational-wave signal should survive. Predictions suggest that, using the cross-correlation technique, the LIGO and Virgo detectors should be sensitive enough to detect the gravitational-wave background within several years.