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aliceiris711 пишет:
5306 дней назадResearchers at the University of Utah say that the way radio signals vary in a wireless network can reveal the movement of people behind closed doors.
aliceiris711 пишет:
5306 дней назадJoey Wilson and Neal Patwari have developed a technique called variance-based radio tomographic imaging that processes the signals to reveal signs of movement. They’ve even tested the idea with a 34-node wireless network using the IEEE 802.15.4 wireless protocol, the protocol for personal area networks employed by home automation services such as ZigBee.
aliceiris711 пишет:
5306 дней назадThe basic idea is straightforward. The signal strength at any point in a network is the sum of all the paths the radio waves can take to get to the receiver. Any change in the volume of space through which the signals pass, for example caused by the movement of a person, makes the signal strength vary. So by “interrogating” this volume of space with many signals, picked up by multiple receivers, it is possible to build up a picture of the movement within it.
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