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

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