Researchers Use Ambient WiFi Radio Waves to See Through Walls
3rd August 2012
Much like radar, the device relies on the Doppler effect — radio waves changing frequencies as they reflect off of moving objects — to identify motion. Using a radio receiver with two antennas and a signal-processing unit, the system monitors the baseline WiFi frequency in an area for changes that would indicate movement. In tests, the gadget was able to determine a person’s location, speed and direction through a foot-thick brick wall. The technology’s potential applications range from domestic uses to scanning buildings during combat. Best of all, since the university’s hardware doesn’t emit any radio waves, it can’t be detected. How’s that for stealthy?
August 3rd, 2012 at 12:07
Big Brother Comes.