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That has been used 8 years ago at least to get info on Hamas tunnels across the Gaza-Israel border: https://www.timesofisrael.com/how-the-tunnels-in-gaza-are-du

• eloff 5y ago
  That was an interesting read, thanks for sharing.
• fsagx 5y ago
  I couldn't find any links, but I remember reading about a system (or proposed system) working on this principle from the 1980s. It was meant to be deployed in the Fulda Gap region to precisely locate moving vehicles.
• Goety 5y ago
  Agreed, old news. Also think about apartment buildings with coax https://ieeexplore.ieee.org/document/6083650 https://ieeexplore.ieee.org/document/6083650 "Human intruder detection with Leaky Coaxial cables for wide area surveillance system" 2011 https://en.wikipedia.org/wiki/Time-domain_reflectometer https://en.wikipedia.org/wiki/Time-domain_reflectometer Paranoid memes below https://www.youtube.com/watch?v=Kr7AONv3FSg https://www.youtube.com/watch?v=Kr7AONv3FSg https://www.youtube.com/watch?v=aPMULk7AhWw https://www.youtube.com/watch?v=aPMULk7AhWw