EP0681723B1 - Entstoerungsfunkvorrichtung fuer systeme zur ueberwachung des eindringens - Google Patents

Entstoerungsfunkvorrichtung fuer systeme zur ueberwachung des eindringens Download PDF

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Publication number
EP0681723B1
EP0681723B1 EP94905142A EP94905142A EP0681723B1 EP 0681723 B1 EP0681723 B1 EP 0681723B1 EP 94905142 A EP94905142 A EP 94905142A EP 94905142 A EP94905142 A EP 94905142A EP 0681723 B1 EP0681723 B1 EP 0681723B1
Authority
EP
European Patent Office
Prior art keywords
jamming
detector
alarm
signal
central unit
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.)
Expired - Lifetime
Application number
EP94905142A
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English (en)
French (fr)
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EP0681723A1 (de
Inventor
Paul Edouard Bouquin
Alain De Salaberry
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/80—Jamming or countermeasure characterized by its function
    • H04K3/88—Jamming or countermeasure characterized by its function related to allowing or preventing alarm transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K2203/00—Jamming of communication; Countermeasures
    • H04K2203/10—Jamming or countermeasure used for a particular application
    • H04K2203/12—Jamming or countermeasure used for a particular application for acoustic communication

Definitions

  • the present invention relates to an anti-jamming device for intrusion monitoring systems in a room.
  • Such systems generally include a plurality of sensors distributed in the premises to be protected and connected to an alarm signaling central, the latter being connected for example to sirens, and in certain cases, to a telephone line for transmitting the alarms. possible at a remote monitoring station.
  • interference detection means consisting in detecting the presence of a permanent signal on the frequency used by the system and in generating a jamming alarm. when such a signal is detected.
  • a solution has also been proposed which consists in having a signal sent regularly by each sensor in the direction of the alarm reporting center. When the control panel no longer receives signals from the sensors, it triggers a jamming alarm.
  • the main object of the present invention is to eliminate these drawbacks. To this end, it offers an anti-jamming device intended to equip an intrusion monitoring system comprising a plurality of sensors connected by radio link to a central alarm signaling member.
  • the proposed device combines two techniques: a first technique based on intrusion detection and a second based on interference detection.
  • the interference transmissions will trigger an alarm only if there has been a prior intrusion. In this way, it is impossible to trigger a false alarm from outside the monitored premises. Conversely, any intrusion attempt during a jamming period will be detected by both the additional sensor and the jamming detector, which will inevitably trigger a jamming alarm.
  • the additional detector is an infrasound detector.
  • a single infrasound detector of the type described in French patent 85 16234 is sufficient to monitor the volume of a room which may include several rooms.
  • detectors of this type remain excellent for detecting any intrusion into a room.
  • a signal will be considered as a signal interference if its amplitude exceeds a certain threshold for a minimum time.
  • the amplitude threshold of the interference signal to be detected and its minimum duration are adjustable.
  • the infrared detector comprises a transducer sensitive to variations in ambient pressure, and for example, a polarized capacitor transforming into an electrical signal, the pressure waves caused by a displacement of air due to, for example, the opening or attempting to open an exit from the monitored room, normally closed.
  • This detector is connected to a time delay which sends, for an adjustable period, an interference alarm validation signal to the alarm circuit, following detection of an intrusion into said zone.
  • the device is connected to the central organ so as not to risk being disturbed by a possible jamming signal, for example by cable, by a radioelectric link using a frequency other than that used by the system. , or by infrared or ultrasound.
  • the device includes a backup power supply and a transmitter, compatible with the receiver of the central organ, and disposed near the latter, always so that the transmission between the device and the central organ is not disturbed by an interference signal.
  • FIG. 1 represents the anti-jamming device 10 according to the invention coupled to an alarm signaling center 7 which is connected to a siren 9 and which is connected by radio link to a plurality of sensors 8.
  • the alarm center can be connected to the public telephone network 12 to transmit the alarms to a remote monitoring station.
  • the anti-jamming device 10 comprises a jamming detector 5, an infrared detector 1, a time delay 2 and a module 6 responsible for developing an alarm signal from the signals from time delay 2 and the jamming detector 5.
  • the jamming detector 5 comprises a radio wave receiver 3 tuned to the frequency used by the alarm signaling center 7, for example 224 MHz. This receiver 3 analyzes the level of the received signal and sends a jamming indication to a counter 4 when this level is at least equal to that received by the alarm center 7 from the intrusion detector 8 furthest from the center. 7.
  • the time counter 4 sends a signal to the module 6 when the jamming indication which is transmitted to it by the receiver 3, is present for an adjustable duration of, for example, more than 50 seconds over an interval of 1 minute.
  • timer 2 for example, 10 minutes.
  • the module 6 which is connected to both the timer 2 and the time counter 4 allows a jamming alarm signal to be sent when it receives a signal from the time counter 4 for the duration set at the timer 2. In this way, in the example indicated above, an alarm will be triggered if there has been interference less than 10 minutes after an intrusion detection by the infrared detector.
  • This alarm is transmitted by a wired link 11 to the timed input of the alarm center 7.
  • the anti-jamming device 10 is designed so as to be able to supplement already installed surveillance systems.
  • the anti-jamming device 10 is connected by the wire link 11 to a radio transmitter 14 set to the timed input of the alarm center 13, and placed very close to the latter. In this way, the connection between the transmitter 14 and the alarm center 13 is not likely to be disturbed by an interference attempt.
  • the alarm center 13 is connected over the air to the siren 16 and to a telephone transmitter 15. If these two elements are too far from the alarm center 13 to be insensitive to interference, a wired connection may be installed between a radio receiver placed near the control panel and these two elements.
  • the anti-jamming device 10 can also include a saved power supply 17 so that it can operate even in the event of a power cut.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)

Claims (11)

  1. Entstörungs-Vorrichtung (10) für ein Eindring-Überwachungssystem, das eine Vielzahl von Sonden (8) aufweist, die über Funk mit einem Zentralorgan (7) zur Anzeige von Alarmmeldungen verbunden sind,
    dadurch gekennzeichnet, daß sie aufweist:
    - einen Detektor (5) für Störemissionen auf der Frequenz, die von den Sonden (8) verwendet wird, um mit dem Zentralorgan (7) in Verbindung zu treten,
    - einen zusätzlichen Detektor (1) getrennt vom Überwachungssystem, der es ermöglicht, jedes Eindringen in die Zone zu erfassen, in der die funkelektrischen Übertragungen zwischen den Sonden (8) und dem Zentralorgan (7) stattfinden,
    - eine Alarmschaltung (6), die das nach der Erfassung eines Störsignals vom Störemissions-Detektor (5) zum Zentralorgan (7) gesendete Alarmsignal validieren soll, wenn ein Eindringen vom zusätzlichen Detektor (1) erfaßt wird.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der zusätzliche Detektor (1) ein Infraschall-Detektor ist.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Störemissions-Detektor (5) einen auf die genannte Frequenz abgestimmten Empfänger (3) für funkelektrische Wellen, der das empfangene Signal analysiert, und einen Zähler (4) aufweist, der vom Empfänger (3) eine Störanzeige empfängt, wenn der Pegel des empfangenen Signals höher als eine Schwelle ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Zähler (4) ein Störalarmsignal an die Alarmschaltung (6) liefert, wenn die Störanzeige während einer festgesetzten Zeitdauer vorliegt.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die festgesetzte Zeitdauer und die Schwelle einstellbar sind.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie ein Verzögerungsglied (2) aufweist, das nach einer Erfassung eines Eindringens in die genannte Zone durch den Infraschall-Detektor (1) während eines bestimmten Zeitraums ein Störalarm-Validierungssignal an die Alarmschaltung (6) sendet.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Dauer dieses Zeitraums einstellbar ist.
  8. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Infraschall-Detektor (1) einen Transduktor und einen polarisierten Kondensator aufweist, der die durch eine Luftbewegung verursachten Druckwellen in ein elektrisches Signal umwandelt.
  9. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie eine Sicherungs-Stromversorgung (17) aufweist.
  10. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie mit dem Zentralorgan (7) über eine Verbindung (11) verbunden ist, die nicht von einem Störsignal gestört werden kann.
  11. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie mit dem Überwachungssystem über ein Kabel (11) verbunden ist, das an einen Sender (14) angeschlossen ist, der in der Nähe des Zentralorgans (13) angeordnet ist.
EP94905142A 1993-01-26 1994-01-21 Entstoerungsfunkvorrichtung fuer systeme zur ueberwachung des eindringens Expired - Lifetime EP0681723B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9300707 1993-01-26
FR9300707A FR2700873B1 (fr) 1993-01-26 1993-01-26 Dispositif antibrouillage radio infraudable pour systèmes de surveillance d'intrusions.
PCT/FR1994/000076 WO1994017505A1 (fr) 1993-01-26 1994-01-21 Dispositif antibrouillage radio infraudable pour systemes de surveillance d'intrusions

Publications (2)

Publication Number Publication Date
EP0681723A1 EP0681723A1 (de) 1995-11-15
EP0681723B1 true EP0681723B1 (de) 1997-12-03

Family

ID=9443334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94905142A Expired - Lifetime EP0681723B1 (de) 1993-01-26 1994-01-21 Entstoerungsfunkvorrichtung fuer systeme zur ueberwachung des eindringens

Country Status (5)

Country Link
EP (1) EP0681723B1 (de)
CA (1) CA2154755A1 (de)
DE (1) DE69407167T2 (de)
FR (1) FR2700873B1 (de)
WO (1) WO1994017505A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506385C2 (de) * 1995-02-23 2002-03-07 Peter John Goddard Drahtlose Gefahren-Meldeanlage und Meldeverfahren
GB2313980B (en) * 1996-06-05 1999-04-28 Yale Security Prod Ltd Radio-type burglar alarm systems
IT1309390B1 (it) * 1999-03-02 2002-01-22 Franco Pedrazzi Modulo rilevatore di accecamento di ricevitori in radiofrequenza deisistemi d'allarme ad onde radio.
ES2187293B1 (es) * 2001-10-25 2004-09-01 S.D.P. Sistemas De Proteccion, S.L. Dispositivo de seguridad y sistema de alarma de intrusion.
GB2438009A (en) * 2006-02-24 2007-11-14 Location Company Ltd Vehicle security system
US9905120B1 (en) 2016-08-29 2018-02-27 At&T Digital Life, Inc. Alarm initiation when sensor is intentionally jammed
FR3073070B1 (fr) * 2017-10-26 2023-05-05 Telecom Design Dispositif de detection et d'alerte pour systeme d'alarme et systeme d'alarme le comprenant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423505A (en) * 1981-11-23 1983-12-27 Loral Corp. Cued adaptive canceller
US4434505A (en) * 1982-12-01 1984-02-28 The United States Of America As Represented By The Secretary Of The Army Interference cancelling system for a mobile subscriber access communications system

Also Published As

Publication number Publication date
WO1994017505A1 (fr) 1994-08-04
FR2700873B1 (fr) 1995-04-07
EP0681723A1 (de) 1995-11-15
CA2154755A1 (fr) 1994-08-04
DE69407167D1 (de) 1998-01-15
FR2700873A1 (fr) 1994-07-29
DE69407167T2 (de) 1998-07-02

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