Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-02-23
1999-10-19
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340541, 340539, G08B 1327
Patent
active
059696087
ABSTRACT:
An intrusion detector has buried sensor modules arranged along a perimeter o 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, and/or 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 low 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.
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Garcia Felipe
Sojdehei John
Woodall Robert
Gilbert Harvey A.
Hofsass Jeffery A.
La Anh
Peck Donald G.
The United States of America as represented by the Secretary of
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