Path-Finder
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I was talking about various sensors based early warning system, which is usually a double fence.
In this warning system if anyone touch the outer fence anywhere, embedded movement sensors will send out alarm. When intruder continue and cross into the razor blade fence, then there's a net of laser lines, which sends out alarm once they are interrupted, lastly there's this high voltage fence, also razor blade wire, which will electrocute upon touching.
The radars will be used as mentioned in the video these radars will be for detecting human movements usually upto 20Km. I am merely talking about cameras that are not the standard type CCTV that you would install on your house but rather military grade cameras that will work in extremely low light levels.
Electro Optics is the correct terminology. Pakistan does make them as well which are FLIR based cameras that have the ability to survey large areas be it day or night. The systems Turkey is Using on its borders with Iraq and Syria is what I am hinting at.