somerandomii t1_ivaa306 wrote
Reply to comment by CompassionateCedar 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
Well water reacts particularly well, and we’re mostly water. So it can be used to track people inside a building fairly well. And because wifi is providing the “active” part of this active scanner, it can be done very covertly. It would be hard to detect that someone is monitoring your building.
But that isn’t what this article is about.
MrHaVoC805 t1_ivbnzw9 wrote
It's actually pretty easy to see if someone is using WiFi to monitor a building. The hard part is nailing down exactly where they are if it's not inside your building.
somerandomii t1_ivcd219 wrote
It’s pretty hard if they’re only listening to your wifi strength and not emitting themself.
MrHaVoC805 t1_ivgl575 wrote
Except for the whole drones being controlled by what's basically WiFi, they use 2.4 and 5ghz frequencies for that and it will be actively transmitting.
somerandomii t1_ivh45oh wrote
As I said, I’m not talking about the technology in the article. That’s an entirely different use case.
Also autonomous drones don’t need to emit wifi. But you wouldn’t fly a drone around a building to covertly monitor personnel. Drones aren’t very subtle.
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