Perhaps you hide your thoughts with an aluminum cap, but you can not hide from wireless networks that can reveal your location, even behind a wall.
Researchers at the University of Utah say that the way ranging signals from a wireless network can reveal the movement of a person behind closed doors. Joey Wilson and Neal Patwari have developed a technique called CT images based on the variance radio waves "that processes the signals to show signs of movement. Even the idea has been tested on a wireless network of 34 nodes using the IEEE 802.15.4 wireless standard, the standard for wireless personal area networks with low rates of data transmission, such as ZigBee.
The basic idea is simple. The signal strength at any point in a network is the sum of all paths of radio waves can take to reach the receiver. Any change in the volume of space through which signals pass, for example, caused by the movement of a person, causes the signal strength varies.
Patwari Wilson and say they were able to locate moving objects in the room less than a meter. The team said that there is great potential for improving its system, increasing accuracy and reducing the number of nodes, especially if the system is used with GPS networks, Wi-Fi or cellular networks.
A major benefit is cost, military systems regulated through walls display can cost up to 100 thousand dollars.
This means that the concept of Vision 3D Sonar Batman: The Dark Knight was not entirely unreasonable.
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