Radio signals that see through walls might end up on drones
By Tim Hornyak August 7, 2014 "Researchers have developed mobile robots that can use Wi-Fi signals to effectively "see through" walls. It's raising the possibility of flying drones using the technology to see inside buildings.Led by Yasamin Mostofi, a professor of electrical and computer engineering, the group at the University of California, Santa Barbara (UCSB) has shown how the radio signals sent and received by a pair of wheeled robots can provide information about what lies behind concrete walls even when the objects do not move.
Depending on their properties, objects behind a wall will attenuate the radio signals. As the robots make multiple passes around on either side of a walled-off area, one robot measures signals broadcast by the other.
Differences in signal strength can reflect the presence of hidden objects, according to the researchers, who formulated a wave-propagation model for the project."
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