On the left a person walks around inside a square of 28 radio transceivers creating "shadows" in the radio waves, resulting in the image displayed on right (Photo: Sarang Joshi and Joey Wilson, University of Utah)
University of Utah engineers have developed a system that uses a wireless network of radio transmitters to track people moving behind solid walls. They say the system could help police, firefighters and other emergency services capture intruders, and rescue hostages, fire victims or elderly people who fall in their homes by letting them know where to focus their attentions. The engineers’ system uses radio tomographic imaging (RTI) to “see”, locate and track people or objects in an area surrounded by inexpensive radio transceivers that send and receive signals.
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