Passive intrusion detection system

Details Passive intrusion detection system Passive intrusion detection system

1996-05-10

1998-01-06

Hofsass, Jeffrey

Communications: electrical

Condition responsive indicating system

Specific condition

340562, 340552, 340566, G08B 1326

Patent

active

057059845

ABSTRACT:
An intrusion detection system. An RF energy source transmits energy into a ransmission cable that has a characteristic impedance subject to change by deformation of the cable. The cable is buried along a path that corresponds to a perimeter to be monitored. When an intruder places weight in the vicinity of the cable, the cable deforms and changes its characteristic impedance. Consequently a portion of energy transmitted into the cable reflects back where time-domain or frequency-domain reflectometry apparatus uses the reflected energy to identify the location of the intrusion along the cable and provide other characteristics of the intruder.

REFERENCES:
patent: Re29896 (1979-01-01), Gilcher
patent: 3056907 (1962-10-01), Costanzo
patent: 4197529 (1980-04-01), Ramstedt et al.
patent: 5448222 (1995-09-01), Harman

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