WO1997022955A3 - Open transmission line intrusion detection system using frequency spectrum analysis - Google Patents

Open transmission line intrusion detection system using frequency spectrum analysis Download PDF

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Publication number
WO1997022955A3
WO1997022955A3 PCT/CA1996/000840 CA9600840W WO9722955A3 WO 1997022955 A3 WO1997022955 A3 WO 1997022955A3 CA 9600840 W CA9600840 W CA 9600840W WO 9722955 A3 WO9722955 A3 WO 9722955A3
Authority
WO
WIPO (PCT)
Prior art keywords
potential alarm
detection system
alarm signal
frequency spectrum
intrusion detection
Prior art date
Application number
PCT/CA1996/000840
Other languages
French (fr)
Other versions
WO1997022955A2 (en
Inventor
Andre Gagnon
Original Assignee
Andre Gagnon
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andre Gagnon filed Critical Andre Gagnon
Priority to EP96940968A priority Critical patent/EP0886841B1/en
Priority to IL12492896A priority patent/IL124928A0/en
Priority to AU10281/97A priority patent/AU1028197A/en
Priority to DE69621653T priority patent/DE69621653D1/en
Priority to US09/077,980 priority patent/US6288640B1/en
Publication of WO1997022955A2 publication Critical patent/WO1997022955A2/en
Publication of WO1997022955A3 publication Critical patent/WO1997022955A3/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
    • G08B13/2497—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field using transmission lines, e.g. cable

Abstract

An intrusion detection system comprises a plurality of sensors (2A...2X) and a corresponding plurality of receivers (3A...3X). Each receiver receives, via the associated sensor, radio frequency signals comprising a multiplicity of transmissions at different frequencies within a predetermined frequency spectrum. The receiver detects the radio frequency signals and computes, for each of a plurality of successive time intervals and for each of the transmission frequencies, a measurement of signal amplitude over the time interval; compares such signal amplitude measurement with at least one threshold and, if the amplitude exceeds the threshold for a predetermined time period, generates a potential alarm signal. A processor (4) compares potential alarm signals from a plurality of sensors and determines that an intrusion has occurred if the potential alarm signal for a particular station does not coincide with a potential alarm signal for a neighbouring sensor. Each receiver may output an intruder alarm signal when potential alarm signals occur simultaneously for more than a preset number of a multiplicity of the transmission frequencies.
PCT/CA1996/000840 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis WO1997022955A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP96940968A EP0886841B1 (en) 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis
IL12492896A IL124928A0 (en) 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis
AU10281/97A AU1028197A (en) 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis
DE69621653T DE69621653D1 (en) 1995-12-15 1996-12-13 INTRUSION DETECTION SYSTEM WITH OPEN TRANSMISSION LINE WITH ANALYSIS OF THE FREQUENCY SPECTRUM
US09/077,980 US6288640B1 (en) 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,165,384 1995-12-15
CA002165384A CA2165384C (en) 1995-12-15 1995-12-15 Open transmission line intrusion detection system using frequency spectrum analysis

Publications (2)

Publication Number Publication Date
WO1997022955A2 WO1997022955A2 (en) 1997-06-26
WO1997022955A3 true WO1997022955A3 (en) 1997-08-21

Family

ID=4157175

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1996/000840 WO1997022955A2 (en) 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis

Country Status (7)

Country Link
US (1) US6288640B1 (en)
EP (1) EP0886841B1 (en)
AU (1) AU1028197A (en)
CA (1) CA2165384C (en)
DE (1) DE69621653D1 (en)
IL (1) IL124928A0 (en)
WO (1) WO1997022955A2 (en)

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Also Published As

Publication number Publication date
EP0886841B1 (en) 2002-06-05
DE69621653D1 (en) 2002-07-11
AU1028197A (en) 1997-07-14
CA2165384A1 (en) 1997-06-16
WO1997022955A2 (en) 1997-06-26
CA2165384C (en) 2008-04-01
EP0886841A2 (en) 1998-12-30
IL124928A0 (en) 1999-01-26
US6288640B1 (en) 2001-09-11

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