Scientists claim to be able to with the help of your existing wi-fi signals the location of a person on the other side of a wall to figure it out. This is a conventional wi-fi router and a special receiver.
The system has been developed by researchers working at the University College London and is based on the Doppler effect. With a specially developed receiver is an antenna used for wi-fi signals that if baseline measurement is used. Then captures a second antenna signals with a different frequency, which, for example, by movement arise. On the basis of these data on the screen, the position of a moving object is displayed.
Because it defines by walls ‘look’ can be, is the system according to the researchers, suitable for monitoring. Also, the police of the wi-fi detection system use. Tests showed that the wi-fi signals is possible to change the position of a person, but also the speed and the direction in which a person walks.
It uses your existing wi-fi signals, resulting in a space so, for example, a working wi-fi router is necessary. This has the advantage that no complex technology is needed: the system has sufficient to the combination of the baseline signal and by the Doppler effect changed the frequency for positioning.
According to scientists, is a device with wi-fi through walls may look, now as the prototype is built. It is unknown when the system is ready for use.
