WO2012087386A1 - Clôture électrique à retour par la terre, à un seul fil, à capacité de localisation d'intrusion - Google Patents

Clôture électrique à retour par la terre, à un seul fil, à capacité de localisation d'intrusion Download PDF

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Publication number
WO2012087386A1
WO2012087386A1 PCT/US2011/047894 US2011047894W WO2012087386A1 WO 2012087386 A1 WO2012087386 A1 WO 2012087386A1 US 2011047894 W US2011047894 W US 2011047894W WO 2012087386 A1 WO2012087386 A1 WO 2012087386A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
electric
wire
receiver
electric fence
Prior art date
Application number
PCT/US2011/047894
Other languages
English (en)
Inventor
Jin Hao
Xuekang Shan
Original Assignee
Jin Hao
Xuekang Shan
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 Jin Hao, Xuekang Shan filed Critical Jin Hao
Publication of WO2012087386A1 publication Critical patent/WO2012087386A1/fr

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Definitions

  • Electric fences are widely used for a variety of applications, mainly being animal control and border security. These electric fences generally consist of bare metal wires mounted on poles via insulators. The metal wires are electrically coupled to a charging device to have a high electric potential relative to ground. The wires will send an electric shock to the intruder or animal when touched.
  • a recently filed patent (application number 12954704) described a transmission line based electric fence with intrusion location ability. It consists of a transmission line (a metal wire pair), a pulse transmitter, and a receiver. The transmitter launches a short electric pulse into the transmission line, which than propagates down the line. When the intruder touches the line, the line will see an impedance change at the point of intrusion, and a portion of the launched energy will be reflected back towards the receiver. From the time interval between launching the pulse and receiving the reflected pulse, the intrusion can be located.
  • a metal wire pair is needed. This metal pair needs to have low loss, to be weather resistant, to be rust free, and needs to be installed properly so as to have a uniform
  • the present invention is a system for locating an intrusion alone an electric fence. It consists of a single metal wire, a signal generator, and a receiver.
  • the metal wire is mounted on fence poles via insulators.
  • the signal generator's output is applied between one end of the wire and the earth.
  • the receiver is connected to the same end of the wire via a transmit/receive switch and a band-pass filter, and the earth.
  • the other end of the wire is connected the earth directly or via a resistor.
  • These components form a single-ended system between the wire and the earth.
  • the signal generator launches signal into this system. When there is no intrusion, the receiver will only see the returned signal from the end of the system. When an intruder touches the wire at a point, a new and shorter earth path is established. The receiver will see an earlier returned signal than without the intruder touching the wire.
  • the distance of intrusion can be calculated from the time interval from the time the signal is launched to the time the returned signal is received, since the pulse propag
  • Fig.l shows a preferred embodiment of the present invention
  • Fig.2 shows an experimental result without noise reduction
  • a single 33 nano second pulse was launched, and a returned signal was detected with a 480 nano second interval.
  • the distance was calculated as 72 meters. Since there was no noise reduction, one can see a curved baseline, indicating unwanted background noise in the system;
  • Fig.3 shows a predicted result with noise reduction. One can see a straight baseline, showing the unwanted background noise is removed.
  • the electric fence 9 includes signal generator 12, metal wire 10, electric receiver 13, transmit/receive switch 15, and signal processor 14.
  • Metal wire 10 is supported by insulators which are mounted on a wall or normal fence.
  • Signal generator 12 launches signal (preferably a single or multiple pulses or coded pulse train) into metal wire 10 with a given time interval.
  • the other end of metal wire 10 is connected to earth directly or via resistor 16.
  • Signal processor 14 records this signal as reference signal.
  • Signal processor 14 records this signal and
  • this single wire earth return electric fence is more susceptible to electro-magnetic interference, as is shown in Fig, 3.
  • band-pass filtering Since the launched signal and the returned signal have the same electric frequency band, band-pass filter 19 may be inserted between the signal generator/receiver and the metal wire/ground, as is shown in Fig. 1.
  • Averaging Since noise is random and the signal is repetitive within a certain time scale, averaging may be used to enhance the signal to noise ratio SNR.
  • the transmitter can launch pulses 1000 times a second. Assume the intruder touches the wire for at least 50 milliseconds. A moving average of 30 -50 pulse periods may improve the SNR.
  • coded pulse train As is well known in communications theory and sensor technology, sending a coded pulse train can considerably enhance received signal to noise ratio.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

L'invention concerne une clôture électrique pour un périmètre de sécurité. La clôture électrique possède un fil métallique qui entoure la zone à protéger, un générateur de signal et un récepteur. La sortie du générateur de signal se connecte au fil métallique et au sol, formant un système à récepteur unique. Le récepteur est également connecté entre le fil et le sol, par l'intermédiaire d'un commutateur d'émission/de réception. Le générateur de signal émet le signal dans la boucle fil/terre. De préférence, le signal est une seule impulsion électrique courte ou de multiples impulsions électriques courtes, ou un seul train d'impulsions codé ou de multiples trains d'impulsion codés. Au bout du fil, une partie de l'énergie du signal est renvoyée vers le récepteur. Lorsqu'un intrus touche le fil en un point, un trajet de retour plus court est établi et le récepteur reçoit ce signal de retour plus tôt que sans intrusion. La distance du point d'intrusion à la borne peut être calculée par la différence de temps entre le moment où le signal est lancé et le moment où le signal de retour est reçu, étant donné que la vitesse de propagation du signal est de 300 m par micro-seconde.
PCT/US2011/047894 2010-12-22 2011-08-16 Clôture électrique à retour par la terre, à un seul fil, à capacité de localisation d'intrusion WO2012087386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US97537810A 2010-12-22 2010-12-22
US12/975,378 2010-12-22

Publications (1)

Publication Number Publication Date
WO2012087386A1 true WO2012087386A1 (fr) 2012-06-28

Family

ID=46314314

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2011/047894 WO2012087386A1 (fr) 2010-12-22 2011-08-16 Clôture électrique à retour par la terre, à un seul fil, à capacité de localisation d'intrusion

Country Status (2)

Country Link
KR (1) KR20120071305A (fr)
WO (1) WO2012087386A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109727415A (zh) * 2019-01-26 2019-05-07 上海启丰电子科技有限公司 脉冲式电子围栏系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523187A (en) * 1980-08-29 1985-06-11 Norman W. Hutchinson & Sons Pty. Ltd. Alarm system for electric fences
US6948452B2 (en) * 2004-01-08 2005-09-27 Wolfgram Industries, Inc. Electric animal deterrent for contact with underlying ground system
WO2008026944A1 (fr) * 2006-08-30 2008-03-06 Gallagher Group Limited Systèmes de clôtures électriques améliorées

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523187A (en) * 1980-08-29 1985-06-11 Norman W. Hutchinson & Sons Pty. Ltd. Alarm system for electric fences
US6948452B2 (en) * 2004-01-08 2005-09-27 Wolfgram Industries, Inc. Electric animal deterrent for contact with underlying ground system
WO2008026944A1 (fr) * 2006-08-30 2008-03-06 Gallagher Group Limited Systèmes de clôtures électriques améliorées

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
THRIMAWITHANA ET AL.: "Pulse Propagation Along Single-Wire Electric Fence", IEEE TRANSACTION POWER DELIVERY, vol. 23, no. 4, October 2008 (2008-10-01), XP011234752, DOI: doi:10.1109/TPWRD.2008.2002653 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109727415A (zh) * 2019-01-26 2019-05-07 上海启丰电子科技有限公司 脉冲式电子围栏系统

Also Published As

Publication number Publication date
KR20120071305A (ko) 2012-07-02

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