Clever new device sees through walls

A new contraption that essentially sees through walls using radio receivers to track moving objects could one day help police and others nab intruders and rescue hostages or fire victims.To test out the technique, the researchers placed a wireless network of 28 radio transceivers around a square-shaped portion of an atrium and a similar part of the lawn. The transceivers were placed on 4-foot-tall (1.2 m) stands made of plastic pipe so they would make measurements at a person's torso level.As a person walked around each area, measurements showed the radio signal strengths between all of the transceivers. The resulting processed data displayed a blob-like image of the moving target on a computer screen.

News source: msnbc