X-ray eyes in the sky: Drones and WiFi for 3-D through-wall imaging

https://www.sciencedaily.com/releases/2017/06/170619144830.htm

Researchers have given the first demonstration of 3-D imaging of objects through walls using ordinary wireless signal. The technique, which involves two drones working in tandem, could have a variety of applications, such as emergency search-and-rescue, archaeological discovery and structural monitoring.

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