The total spread of Wi-Fi devices has led to the fact that we and everything that surrounds us is literally shrouded in an invisible "blanket" of signals emitted by them. Researchers at the Technical University of Munich decided that such "good" should not be wasted, since it can be successfully used to create three-dimensional images of space.
Like any microwave radiation, signals from routers are reflected from people and surrounding objects. According to the director of the research group at the University of Munich, Reinhard Friedemann, if you learn to catch these reflected signals, you can track the movement of objects and create three-dimensional images of the space around the Wi-Fi point.
Similar technologies have already been used to create devices that "see" through walls, capable of distinguishing human figures and determining their number. Scientists from Munich have gone further by learning how to generate a complete 3D image of the space of a room or even a building using Wi-Fi and cellular signals.
The system requires one fixed and one mobile antenna to function. However, researcher Philip Hall argues that the mobile antenna can be replaced with several conventional ones.
In the future, this technology will help in the creation of devices used to search for lost things, as well as victims, trapped under avalanches and ruins of buildings.