CA2165384A1 - Open transmission line intrusion detection system using frequency spectrum analysis - Google Patents

Open transmission line intrusion detection system using frequency spectrum analysis

Info

Publication number
CA2165384A1
CA2165384A1 CA002165384A CA2165384A CA2165384A1 CA 2165384 A1 CA2165384 A1 CA 2165384A1 CA 002165384 A CA002165384 A CA 002165384A CA 2165384 A CA2165384 A CA 2165384A CA 2165384 A1 CA2165384 A1 CA 2165384A1
Authority
CA
Canada
Prior art keywords
potential alarm
transmission frequencies
potential
signals
signal
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002165384A
Other languages
French (fr)
Other versions
CA2165384C (en
Inventor
Andre Gagnon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Auratek Security LLC
Original Assignee
Individual
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
Priority to CA002165384A priority Critical patent/CA2165384C/en
Application filed by Individual filed Critical Individual
Priority to AU10281/97A priority patent/AU1028197A/en
Priority to EP96940968A priority patent/EP0886841B1/en
Priority to PCT/CA1996/000840 priority patent/WO1997022955A2/en
Priority to US09/077,980 priority patent/US6288640B1/en
Priority to IL12492896A priority patent/IL124928A0/en
Priority to DE69621653T priority patent/DE69621653D1/en
Publication of CA2165384A1 publication Critical patent/CA2165384A1/en
Application granted granted Critical
Publication of CA2165384C publication Critical patent/CA2165384C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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 and a corresponding plurality of receivers, each receiver coupled to receive via the associated sensor radio frequency signals having 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 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 conidtion. A common processor monitors the potential alarm conditions for the plurality of receivers and provides an actual alarm signal when at least one of the receivers indicates potential alarm conditions for a predetermined number of the different transmission frequencies within the same time period. Preferably, the processor 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 compare potential alarm signals for a plurality of the transmission frequencies and output an intruder alarm signal when potential alarm signals occur simultaneously for more than a preset number of the multiplicity of transmission frequencies.
CA002165384A 1995-12-15 1995-12-15 Open transmission line intrusion detection system using frequency spectrum analysis Expired - Fee Related CA2165384C (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CA002165384A CA2165384C (en) 1995-12-15 1995-12-15 Open transmission line intrusion detection system using frequency spectrum analysis
EP96940968A EP0886841B1 (en) 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis
PCT/CA1996/000840 WO1997022955A2 (en) 1995-12-15 1996-12-13 Open transmission line intrusion detection system using frequency spectrum analysis
US09/077,980 US6288640B1 (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
IL12492896A IL124928A0 (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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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
CA2165384A1 true CA2165384A1 (en) 1997-06-16
CA2165384C CA2165384C (en) 2008-04-01

Family

ID=4157175

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002165384A Expired - Fee Related CA2165384C (en) 1995-12-15 1995-12-15 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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US8456304B2 (en) * 2006-07-12 2013-06-04 Intelligent Automation, Inc. Perimeter security system
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US20080079572A1 (en) * 2006-09-28 2008-04-03 Zohar Tsaba Apparatus and method for using a wireless network as a motion detection system
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Also Published As

Publication number Publication date
CA2165384C (en) 2008-04-01
AU1028197A (en) 1997-07-14
WO1997022955A3 (en) 1997-08-21
EP0886841B1 (en) 2002-06-05
DE69621653D1 (en) 2002-07-11
IL124928A0 (en) 1999-01-26
US6288640B1 (en) 2001-09-11
EP0886841A2 (en) 1998-12-30
WO1997022955A2 (en) 1997-06-26

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EEER Examination request
MKLA Lapsed

Effective date: 20131217