DistanceDetection
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WiFi distance detector could shut out router invaders
Researchers from MIT have figured out how to detect the distance between WiFi users and a single router, a feat that could make drones safer and public internet more secure. They did it by measuring the "time of flight" of WiFi signals between the transmitter and receiver, and multiplying by the speed of light to calculate distance. That concept isn't new, but MIT's CSAIL team, which has already looked through walls using WiFi, managed to build a working prototype.
