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Posted by on Aug 3, 2012 in Science |

Invent how to use a WiFi router and using the Doppler radar

Invent how to use a WiFi router and using the Doppler radar

(CC) misterbisson

Karl Woodbridge and Kevin Chetty, scientists at University College London designed a device that includes a signal and detects the changes they generate radio waves moving objects due to the Doppler effect, and thus opens the possibility of using any WiFi router as radar.

The device, the size of a briefcase, is a passive receiver of radio waves of 2.4 GHz and two antennas, one that picks up the signal and the other to detect their changes due to Doppler effect. Thus, the device can detect a person’s location, speed and direction inside a building where there is a WiFi signal even through a brick wall 30 centimeters thick.

Furthermore, since the device is a passive-that is you only get the signal without making anything, it can not be detected, which opens to find many applications for military use, as well as to monitor children or elderly people and a lot other functions.

Woodbridge suggests that even if it refines the sensitivity of the apparatus, would have the potential to detect even the movement of the chest of a person to breathe, letting you know if you are standing or sitting.

Invent how to use a WiFi router and using the Doppler radar image 2

(C) Popular Science

Link: Seeing Through Walls With a Wireless Router

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