Accession Number:

ADD018925

Title:

Passive Intrusion Detection System.

Descriptive Note:

Patent, Filed 10 May 96, patented 6 Jan 98,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1998-01-06

Pagination or Media Count:

14.0

Abstract:

An RF energy source transmits energy into a transmission 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.

Subject Categories:

  • Radio Countermeasures

Distribution Statement:

APPROVED FOR PUBLIC RELEASE