Magneto-Inductive Seismic Fence
Patent, Filed 23 Feb 1998, patented 19 Oct 1999
DEPARTMENT OF THE NAVY WASHINGTON DC
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An intrusion detector has honed sensor modules arranged along a perimeter to sense seismic vibrations caused by intrusions within the area defined by the perimeter. The sensor modules transmit data representative of the intrusions via magneto-inductive signals in the ELF to VLF range through ground, air, andor water to at least one buried relay module within the area. The relay modules transmit RF signals representative of the intrusion data via a camouflaged RF antenna to mobil or fixed stations for appropriate action. Transmission of magneto-inductive signals in the ELF to VLF range is clandestine and reliable, and locations of buried sensor modules and relay modules are not revealed to intruders to reduce the possibility of evasion or tampering. The sensor modules may have sensor elements sensitive to humans, vehicles, and tow flying aircraft to give enforcement officers the opportunity to better utilize their resources where the intrusions are occurring. In addition, this system could be placed along many well-used passageways, such as highways, roads, trails, air corridors, etc. to gather information regarding use of facilities and resources to help governmental officials and planners make intelligent decisions.
- Seismic Detection and Detectors