p2pnet news view | Cool:- How about this for Ãber Cool?
Researchers at the University of Utah says they’ve found a way to image, localize, and track motion behind walls in real-time.
In other words, they say they can see through solid matter.
And they’re using WiFi to do it.
The method takes advantage of the motion-induced variance of received signal strength measurements made in a wireless peer-to-peer network.
Using a multipath channel model, we show that the signal strength on a wireless link is largely dependent on the power contained in multipath components that travel through space containing moving objects.
A statistical model relating variance to spatial locations of movement is presented and used as a framework for the estimation of a motion image.
From the motion image, the Kalman filter is applied to recursively track the coordinates of a moving target. Experimental results for a 34-node through-wall imaging and tracking system over a 780 square foot area are presented.
“In a mission-critical application, we envision a building imaging scenario similar to the following,” they say in Through-Wall Motion Tracking Using Variance-Based Radio Tomography Networks, going on »»»
Emergency responders, miltary forces, or police arrive at a scene where entry into a building is potentially dangerous. They deploy radio sensors around (and potentially on top of) the building area, either by throwing or launching them, or dropping them while moving around the building. The nodes immediately form a network and self-localize, perhaps using information about the size and shape of the building from a database (e.g., Google maps) and some known-location coordinates (e.g., using GPS).
Then, nodes begin to transmit, making signal strength measurements on links which cross the building or area of interest. The RSS measurements of each link are transmitted back to a base station and used to estimate the positions of moving people and objects within the building.
Now you know.
First they ignore you, then they laugh at you, then they fight you, then you win ~ Mahatma Gandhi
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