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Asteroid threat demands response, experts warn - space - 17 February 2007 - New Scientist Space

February 18, 2007

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Asteroid threat demands response, experts warn - space - 17 February 2007 - New Scientist Space

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Wi-Fi signals used to see through w

Wi-Fi signals used to see through walls Scientists at the University of Utah in the United States have found a way to harness Wi-Fi signals to 'see' through solid walls By Claudine Beaumont, Technology Editor Published: 2:08PM BST 02 Oct 2009 Researchers from the University of Utah have found a way of harnessing Wi-Fi signals to see through walls The researchers say that the variation of radio signals in a wireless network can reveal the movements of people behind closed doors or even a wall. Joey Wilson and Neal Patwari, from the University of Utah, have used the principle of variance-based radio tomographic imaging. The system works by measuring interference between the nodes of wireless devices. If someone passes through that field, the device registers a change in the levels of resistance, and feeds that information back to a computer. The system can currently only see about three feet through a wall, and is so far only capable of sensing motion. At this stage, it is...

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