EP0837432B1 - Vorrichtung zur Überwachung eines elektronischen Sicherungselementes in einer Abfragezone - Google Patents

Vorrichtung zur Überwachung eines elektronischen Sicherungselementes in einer Abfragezone Download PDF

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Publication number
EP0837432B1
EP0837432B1 EP97117104A EP97117104A EP0837432B1 EP 0837432 B1 EP0837432 B1 EP 0837432B1 EP 97117104 A EP97117104 A EP 97117104A EP 97117104 A EP97117104 A EP 97117104A EP 0837432 B1 EP0837432 B1 EP 0837432B1
Authority
EP
European Patent Office
Prior art keywords
signal
direct signal
direct
computing
received
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
EP97117104A
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German (de)
English (en)
French (fr)
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EP0837432A1 (de
Inventor
David Stocks
Terry Clancy
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.)
Meto International GmbH
Original Assignee
Meto International GmbH
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 Meto International GmbH filed Critical Meto International GmbH
Publication of EP0837432A1 publication Critical patent/EP0837432A1/de
Application granted granted Critical
Publication of EP0837432B1 publication Critical patent/EP0837432B1/de
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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
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2482—EAS methods, e.g. description of flow chart of the detection procedure
    • 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
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter

Definitions

  • the invention relates to a device for monitoring of an electronic security element in one Interrogation zone, consisting of a transmission device, the at least one periodic interrogation signal in the interrogation zone sends out, the interrogation signal the security element stimulates to send a detection signal, one Receiving device which receives the detection signal, and a computing / control unit that the by the Received device evaluates signals and at Identification of the security element an alarm triggers.
  • EP 123 586 B proposes to send a field with a frequency F3 in the Hz range to the interrogation zone in addition to two interrogation fields with the frequencies F1 and F2 in the kHz range.
  • the low-frequency interrogation field causes the securing element to be driven from saturation in one direction to saturation in the other direction in time with this field.
  • the characteristic signal therefore occurs periodically with the frequency of the low-frequency field.
  • the invention has for its object a device propose the recognition of articles related to electronically detectable security elements are improved within a query zone.
  • the object is achieved in that the computing / control device the received signal in terms of amplitude and phase (I component and Q component) evaluates that a non-static interference signal occurring in the received signal recognizes and approximates and that it received signal freed from the interference signal.
  • the base signal b (s) corresponds to the signal generated by the Analog to Digital Converters (ADC) appears when the Transmitter is turned off and no external Noise sources are present.
  • the basic signal b (s) therefore corresponds to that of the electronics of the receiving device resulting signal.
  • the transmitting device When the transmitting device is switched on, a small proportion of the transmitted signal is received directly by the receiving device.
  • This signal component corresponds to the direct signal d (s).
  • the direct signal varies in both amplitude and phase when, for example, a person is in the vicinity of the receiving device.
  • a security element As soon as a security element passes the interrogation zone, it generates a detection signal proportional to the transmission signal. This signal is therefore also proportional to the direct signal d (s).
  • External noise signals that are received by the receiving device are reflected in the signal component n (s).
  • the direct signal d * (s) is equal to k • e j ⁇ • d (s) and the response signal of the security element t * (s ) is set equal to t (s), where k in turn describes the change in amplitude and ⁇ the change in phase of the direct signal d (s).
  • every non-linear material in the interrogation zone generates electromagnetic signals with the frequency F1 + F2 or their harmonics, including shopping trolleys or metal packaging.
  • metal plates are often provided on the side facing away from the interrogation zone. If the interference were static, it would be sufficient to always subtract a constant value from the received signal.
  • the interference signals change, for example as a result of fluctuations in the power supply - this causes amplitude changes -, the frequencies F1, F2, F3 used in the system - these cause phase changes - or a mechanical movement - this affects Amplitude and phase. Since the amplitudes of these interference signals are up to 20 times larger than the detection signals from fuse elements, slight fluctuations already have a serious effect on the detection probability of fuse elements if a simple subtraction algorithm is used. It is therefore of outstanding importance that amplitude and phase changes in the direct signal can be compensated for in accordance with the invention.
  • the computing / regulating device outputs the direct signal d (s) the difference in long-term averages of received signals r (s) and base signals b (s) are determined. This allows increase the measuring accuracy of the device.
  • the rotation is obtained by multiplying d (s) by the complex number Re_Energie - j • Im_Energie ⁇ Re_Energie 2 + Im_Energy 2 . simulated, where Re_Energie characterizes the energy of the real part and Im_Energie the energy of the imaginary part of the direct signal d (s).
  • the computing / control device then subtracts the calculated (simulated) value for fd (s) from that received signal r (s).
  • Fig. 1 shows a schematic representation of the Device 1 according to the invention for detecting a a securing element 2 provided Article 6 in one Query zone 3.
  • Query zone 3 is composed of two in essentially parallel detector gates formed, the transmitter 4 and the Receiving device 5 included. Of course you can both devices 4, 5 also in a detector gate be housed.
  • the control of the monitoring device 1 and the evaluation of the measured values takes place by means of the computing / regulating device 7.
  • the transmission device 4 transmits cyclically Scan signals of a predetermined bandwidth in the Query zone 3 off.
  • the bandwidth is such that it is ensured that all for article security resonant circuits used despite production-related Tolerances in their resonance frequency are detected become.
  • the receiving device 5 receives a signal r (s) that in addition to the detection signal t * (s) also a signal component d (s), which is sent directly from the transmitting device 4 originates, as well as signals from external noises n (s).
  • the received signals r (s) are in the amplifier 10 amplified and demodulated in the demodulator 11.
  • the Analog-digital converter 12 subsequently provide measured values for the I component, which is the amplitude of a received Signal r (s) reflects, and the Q component that Contains phase information of the received signal r (s), to the computing / control device 7.
  • FIG. 3 shows an analog block diagram of a monitoring device 1 for electromagnetic safety elements 2.
  • Send the two transmission antennas of the transmission device 4 Signals of frequencies F1, F2 and F3 in interrogation zone 3.
  • the interrogation signals make the electromagnetic Securing element 2, which is essentially made of a metal with non-linear magnetic properties Transmission of detection signals t * (s) stimulated by the receiving device 5 can be received.
  • the received signals r (s) also contain signals n (s) which come from external noise sources.
  • Program items 14 to 18 include a so-called initialization program, which is connected upstream of the actual control program. This initialization program is preferably run through at a fixed time interval in order to ensure that the device 1 according to the invention is always available with the latest possible output values.
  • the receiving device is activated under program point 15.
  • the received signals r (s) are averaged over m cycles in accordance with program point 16, the duration of a cycle in each case corresponding to the duration of a periodic interrogation signal.
  • the averaged value is stored as base signal b (s).
  • this basic signal corresponds to the signal component of the receiving device 5 when the transmitting device 4 is switched off. Subsequently, the transmission device 4 is switched on in accordance with program point 17. At point 18, the corresponding averaged base signal b (s) is subtracted from the received signal averaged over several cycles. The result of this calculation is the direct signal d (s).
  • the improved turned direct Signal ard (s) correlated with the received signal r '(s).
  • the I component and the Q component of the received signal r '(s) r (s) - b (s) with the I component of the improved rotated direct signal ard (s) correlated.
  • rc corr (Re (ard (s)), Re (r '(s))) the proportion of ard (s) contained in the I component of the received signal r (s) -b (s)
  • ic corr (Re (ard (s)), Im (r '(s))) the proportion of the improved signal ard (s) which is contained in the Q component of the received signal r (s) - b (s).
  • the rotated direct signal rd (s) is multiplied by the coefficients calculated under point 24.
  • the final direct signal fd (s) then results in fd (s) ⁇ rd (s) • (rc-j • ic).
  • the detection signal of the security element 2 is calculated under program item 26 using the following formula: t (s) ⁇ r '(s) - fd (s).
  • the detection signal t (s) of the security element is normalized to the final direct signal fd (s) at program point 27; t (s) ⁇ t (s) / fd (s).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP97117104A 1996-10-18 1997-10-02 Vorrichtung zur Überwachung eines elektronischen Sicherungselementes in einer Abfragezone Expired - Lifetime EP0837432B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19642985A DE19642985A1 (de) 1996-10-18 1996-10-18 Vorrichtung zur Überwachung eines elektronischen Sicherungselementes in einer Abfragezone
DE19642985 1996-10-18

Publications (2)

Publication Number Publication Date
EP0837432A1 EP0837432A1 (de) 1998-04-22
EP0837432B1 true EP0837432B1 (de) 2002-07-03

Family

ID=7809080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117104A Expired - Lifetime EP0837432B1 (de) 1996-10-18 1997-10-02 Vorrichtung zur Überwachung eines elektronischen Sicherungselementes in einer Abfragezone

Country Status (4)

Country Link
US (1) US6064296A (es)
EP (1) EP0837432B1 (es)
DE (2) DE19642985A1 (es)
ES (1) ES2177874T3 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19809433C1 (de) * 1998-03-05 1999-06-24 Siemens Ag Verfahren zum Initialisieren eines Diebstahlschutzsystems für ein Kraftfahrzeug
NL1026690C2 (nl) * 2004-07-20 2006-01-23 Nedap Nv Elektronisch detectiesysteem voor het detecteren van antidiefstal- en/of identificatielabels.
KR100814002B1 (ko) * 2006-06-29 2008-03-14 삼성전자주식회사 전파 식별을 위한 데이터 복원 방법 및 장치

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168496A (en) * 1977-10-05 1979-09-18 Lichtblau G J Quasi-stationary noise cancellation system
US4531117A (en) * 1983-07-05 1985-07-23 Minnesota Mining And Manufacturing Company Variable frequency RF electronic surveillance system
CA1234892A (en) * 1984-02-16 1988-04-05 Pierre Taillefer Security tag detection system
US4668942A (en) * 1984-11-19 1987-05-26 Progressive Dynamics, Inc. Signal analysis apparatus including recursive filter for electromagnetic surveillance system
SE9203479L (sv) * 1992-01-20 1993-07-21 Rso Corp Saett och anordning vid elektronisk identifiering
US5349339A (en) * 1992-04-07 1994-09-20 Actron Entwicklungs Ag Apparatus for the detection of labels employing subtraction of background signals
DE4436977A1 (de) * 1994-10-15 1996-04-18 Esselte Meto Int Gmbh Anlage zur elektronischen Artikelüberwachung

Also Published As

Publication number Publication date
DE59707635D1 (de) 2002-08-08
EP0837432A1 (de) 1998-04-22
ES2177874T3 (es) 2002-12-16
US6064296A (en) 2000-05-16
DE19642985A1 (de) 1998-04-23

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