At University College London (part of the University of London), designed a radar capable of identifying changes in frequency, which gives you the ability to detect objects and people moving across a wall. Karl Woodbridge and Kevin Chetty have built a prototype of the radar which is the size of a suitcase. Under the Radar is a radio wave receiver with two antennas and a signal processing unit. Investigators say they were able to use the device to determine location, speed and direction of a person.
The most interesting thing is that the technology of radar also allows you to capture changes in frequency through a brick wall up to 30 centimeters wide and it can not be detected because it does not emit any type of wave, only receive. Is expected to be completed when the device can be used by the military and the police.
There is a small drawback with the radar and it is needed that the other side wall has a wave-emitting source, such as, for example, a WiFi router (as seen in the figure).
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