myalt08831 t1_ivarbmb wrote
Reply to comment by weizXR in Researchers create a Drone That Can 'See Through Walls' With Wifi | At the University of Waterloo recently fixed one up with a scanning device that is the definition of invasive. by chrisdh79
It's not the amplitude of signal strength. Time of flight uses a precise timestamp in the data packet from the exact moment when the packet is emitted, and you use the time elapsed between the initial timestamp and when you got the message, divided by the expected physical speed of propagating the signal through space, to estimate distance from the transmitter to the receiver.
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