EP1064632B1 - Electronic sensor for identifying objects to prevent them from being lost, stolen or moved - Google Patents

Electronic sensor for identifying objects to prevent them from being lost, stolen or moved Download PDF

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Publication number
EP1064632B1
EP1064632B1 EP99909006A EP99909006A EP1064632B1 EP 1064632 B1 EP1064632 B1 EP 1064632B1 EP 99909006 A EP99909006 A EP 99909006A EP 99909006 A EP99909006 A EP 99909006A EP 1064632 B1 EP1064632 B1 EP 1064632B1
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EP
European Patent Office
Prior art keywords
transponders
central unit
transponder
mode
sensor according
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EP99909006A
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German (de)
French (fr)
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EP1064632A1 (en
Inventor
Bruno Enea
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DIPO SA
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DIPO SA
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0205—Specific application combined with child monitoring using a transmitter-receiver system
    • G08B21/0211—Combination with medical sensor, e.g. for measuring heart rate, temperature
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1427—Mechanical actuation by lifting or attempted removal of hand-portable articles with transmitter-receiver for distance detection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0227—System arrangements with a plurality of child units
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0288—Attachment of child unit to child/article
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0294—Display details on parent unit

Definitions

  • the present invention relates to a detector electronics intended in particular for the detection of theft, loss, or displacement of objects.
  • the document DE3618416 relates to a device electronic for monitoring baggage or other objects, including an electronic central unit exchanging coded information with units secondary or transponders likely to be placed in the objects to be monitored or attached to them, which central unit is programmable according to the number of secondary units, reception level, or other parameters, and sends call signals to secondary units which respond to the central unit which trigger, depending on the signals received, an alarm.
  • One of the problems to be resolved is therefore the creation of an object detection device using small transponders capable to effectively cover a defined volume with exchanges between the transponders and the central unit in a high frequency band.
  • the object of the present invention is to remedy these disadvantages by proposing a detection device objects using small transponders offering significant autonomy of use and allowing easy calibration and operation of the device and ensuring good safety of operation.
  • the electronic object detector according to the invention is of the type comprising a central unit electronic exchange of information coded by radiofrequency with at least one transponder, associated with a object to monitor in order to verify its presence in a defined volume and issuing an alarm when said transponder is no longer present in the volume of monitoring characterized in that the transponder is switched on automatically in a state of sleep outside the phases active transponder and in that the central unit selectively matches with said transponder.
  • An active phase corresponds to an active state of reception and processing of a signal sent by the unit central unit and, optionally, an active transmission state of a message in response to said signal.
  • the signal sent by the central unit can be a request signal for presence and the response signal sent by the transponder a coded message of confirmation of presence of the transponder in the volume to be monitored.
  • the relationship between the duration of an active phase and the operating cycle time will be very short and preferably less than 10%, so as to give with transponders a great autonomy of energy.
  • the central unit consists of a circuit transmission / reception, an interface comprising a buffer memory allowing the radio frequency link of the central unit with several transponders, one microcontroller and memories containing the algorithms, in the form of computer programs, different detector operating modes.
  • the transponders include in a first embodiment a microcontroller and memories, a transmission / reception circuit and an interface comprising a buffer memory allowing the connection with several controllers.
  • Transponders include in a second embodiment a transmission / reception circuit and a smart memory suitable, when receiving a pulse sent by the central unit, to be sent via said transmission / reception circuit coded information contained in its memory to the central unit.
  • the detector according to the present invention can further include an initialization mode intended for introduce new transponders and therefore modify the transponder referencing memory.
  • This mode uses the time provided at the start of the interrogation frame transponders to initialize the new transponder and reference it in memory for identification and its monitoring, the other referenced transponders and identified being, in this mode, and at this time space Standby.
  • the detector according to the invention can also include a mode for erasing the memory of transponders that the user does not wish to keep.
  • the central unit can include advantageously means such as indicator lights or an alpha-numeric display screen allowing to inform the user of each operating mode of the detector, for example in the case of introduction a new transponder, confirming that it has has been referenced in the memory of the central unit, then identified to be monitored.
  • advantageously means such as indicator lights or an alpha-numeric display screen
  • the transponders are capable of being integrated each into a object to monitor or are each in the form an electronic tag that can be joined to said object and each transponder is supplied with energy so autonomous or by the central unit.
  • an object detection device comprises a central unit 1 exchanging information 10 with transponders 11 each associated with an object, not shown, for the purpose of checking their presence in a defined volume 12.
  • the central unit 1 thus manages the presence verification communications transponders 11 in monitoring volume 12 and, in if one of them is absent, triggers an alarm sound 13.
  • a unit central unit 1 comprises a transmission / reception circuit 20, connected to an antenna 21, connected to an interface 20 ' allowing the connection with several transponders 11, and a microcontroller 22 connected on the one hand to the interface 20 and on the other hand to a read only memory 23 containing the computer program integrating the algorithms of different operating modes (visible on Figures 4a to 4e) of the device, and to a random access memory 23 ' intended to contain parameters inherent in transponders 11, a buzzer 24 for issuing the alarm sound 13 and one or more LED 25 for the emission of a luminous alarm signal allowing to give to user information about how the device.
  • Each transponder 11 consists of a microcontroller 30 connected to transmission / reception circuit 31, connected to an antenna 32, and to memories 33, containing the characteristics of the transponder 11 and in particular coded information intended to be sent to the central unit at its request, and two 34.34 'time unit counters.
  • the transmitter of the transmission / reception circuits 20.31 includes, not shown, a data entry digital and a transmission circuit for transmitting preferably digital information, in a range of frequency higher than about 400 Mghz, at distances of the order of several meters and in particular from 1 to approximately 120m.
  • the receiver can use a structure superheterodyne type with two mixers allowing the retrieving information from the unit central unit either in analog form or in form digital. It can also be adapted to issue a carrier detection signal indicating reception will happen.
  • the detection mode thus makes it possible to locate a lost object and avoid any risk of introducing a supernumerary transponder 11 for substitution purposes malicious or hacking of a referenced transponder and calibrated with the same coding.
  • this transponder is then automatically put to sleep for a certain period 43 by means of the second time unit counter 34 '.
  • the transponders reactivate their counter 34 on receipt of a pulse 44 from the central unit 1, then wake up at the end of counting of the counter and, if they receive a pulse 46 during their waking time. from the central unit 1 sends back a coded message 42 indicative of their presence. It can thus be seen in FIG.
  • Transponders can be integrated into a object to be protected such as a smart card intended for banking applications respecting the constraints of surface and thickness, or can for example be present in the form of an electronic label independent, can be joined together, for example by bonding, to the object to protect.
  • communications between the central unit and the transponders will be encrypted.
  • an absence counter can be set up so that the central unit does not trigger its alarm only after n absences, thus avoiding alarms untimely.
  • the central unit can be integrated into a cell phone or other device and be in consequence powered by the latter's battery.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Cardiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention concerns an electronic sensor in particular for detecting theft or loss of objects comprising a central electronic unit (1) exchanging coded data by radio frequency with at least a transponder (11), associated with an object to be monitored to verify its presence in a located volume (12) and emitting an alarm (13) when said transponder (11) is no longer present in the monitored volume (12). The invention is characterised in that said transponder (11) is automatically set in stand-by mode outside the transponder active phases (11) and the central unit (1) selectively corresponds with said transponder.

Description

La présente invention a pour objet un détecteur électronique destiné notamment à la détection du vol, de la perte, ou du déplacement d'objets.The present invention relates to a detector electronics intended in particular for the detection of theft, loss, or displacement of objects.

On connaít actuellement des dispositifs permettant de surveiller la présence d'objets dans une zone définie tels que celui décrit dans le document US5396218 qui comprend une carte maítre et au moins une carte esclave ou transpondeur destinée à être logée dans l'objet à surveiller, adaptées pour échanger des informations entre elles par radiofréquences, laquelle carte maítre qui forme le système central de contrôle comporte un circuit d'alarme qui est activé lorsque la carte esclave quitte le champ de protection.We currently know devices to monitor the presence of objects in an area defined such as that described in the document US5396218 which includes a master card and at least one slave card or transponder intended to be housed in the object to monitor, suitable for exchanging information between them by radio frequencies, which master card which forms the central control system includes an alarm circuit which is activated when the slave card leaves the field of protection.

Le document DE3618416 a pour objet un dispositif électronique destiné à la surveillance de bagages ou autres objets, comprenant une unité centrale électronique échangeant des informations codées avec des unités secondaires ou transpondeurs susceptibles d'être placés dans les objets à surveiller ou solidarisées à ces derniers, laquelle unité centrale est programmable en fonction du nombre d'unités secondaires, du niveau de réception, ou autres paramètres, et émet des signaux d'appel vers les unités secondaires qui répondent à l'unité centrale qui déclenchent, en fonction des signaux reçus, une alarme.The document DE3618416 relates to a device electronic for monitoring baggage or other objects, including an electronic central unit exchanging coded information with units secondary or transponders likely to be placed in the objects to be monitored or attached to them, which central unit is programmable according to the number of secondary units, reception level, or other parameters, and sends call signals to secondary units which respond to the central unit which trigger, depending on the signals received, an alarm.

Toutefois, dans ces dispositifs les circuits électroniques des unités secondaires sont en permanence en activité, ce qui pose des problèmes de consommation d'énergie et donc d'autonomie notamment si l'on utilise des unités secondaires ou transpondeurs de petites dimensions avec des émissions de signaux à des fréquences élevées, supérieures à environ 400 Mghz, qui demandent une consommation en énergie importante pour obtenir une couverture homogène des émissions/réceptions dans un volume de plusieurs mètres de type sphérique ou en étoile. D'autre part ces dispositifs possèdent une alimentation intégrée qui ne peut être ni rechargée ni remplacée. En outre ces dispositifs obligent l'utilisateur à activer et à désactiver tous les transpondeurs s'il souhaite arrêter ou réactiver le système par exemple lorsqu'il se trouve dans son lieu de travail ou son domicile ou autre lieu ne nécessitant pas de protection, ce qui est contraignant sachant que cette intervention doit être effectuée plusieurs fois par jour.However, in these devices the circuits electronics of secondary units are permanently in activity, which poses consumption problems of energy and therefore of autonomy especially if we use secondary units or small transponders with signal emissions at high frequencies, greater than approximately 400 Mghz, which require a significant energy consumption to obtain a uniform coverage of transmissions / receptions in a volume of several meters of spherical or star type. Else apart these devices have an integrated power supply which cannot be recharged or replaced. Furthermore these devices require the user to activate and to deactivate all transponders if he wishes to stop or reactivate the system for example when it is in his place of work or his home or other place does not requiring no protection, which is binding knowing that this intervention must be carried out several times a day.

D'autre part ces dispositifs ne prévoient pas de signalement lorsqu'une unité surnuméraire de même codage est introduite dans le champ de protection du dispositif à des fins de substitution malveillante d'une unité secondaire protégée.On the other hand these devices do not provide when a supernumerary unit of the same coding is introduced in the protective field of the device for the purpose of malicious substitution of a protected secondary unit.

Un des problèmes à résoudre est donc la réalisation d'un dispositif de détection d'objets utilisant des transpondeurs de petites dimensions capable de couvrir efficacement un volume défini avec des échanges d'informations entre les transpondeurs et l'unité centrale dans une bande de fréquence élevée.One of the problems to be resolved is therefore the creation of an object detection device using small transponders capable to effectively cover a defined volume with exchanges between the transponders and the central unit in a high frequency band.

La présente invention a pour but de remédier à ces inconvénients en proposant un dispositif de détection d'objets au moyen de transpondeurs de petites dimensions offrant une autonomie importante d'utilisation et permettant un étalonnage et un fonctionnement aisé du dispositif et assurant une bonne sécurité de fonctionnement.The object of the present invention is to remedy these disadvantages by proposing a detection device objects using small transponders offering significant autonomy of use and allowing easy calibration and operation of the device and ensuring good safety of operation.

Le détecteur électronique d'objets selon l'invention est du type comprenant une unité centrale électronique échangeant des informations codées par radiofréquence avec au moins un transpondeur, associé à un objet à surveiller en vue de vérifier sa présence dans un volume défini et émettant une alarme lorsque ledit transpondeur n'est plus présent dans le volume de surveillance caractérisé en ce que le transpondeur est mis automatiquement en état de sommeil en dehors des phases actives du transpondeur et en ce que l'unité centrale correspond de manière sélective avec ledit transpondeur.The electronic object detector according to the invention is of the type comprising a central unit electronic exchange of information coded by radiofrequency with at least one transponder, associated with a object to monitor in order to verify its presence in a defined volume and issuing an alarm when said transponder is no longer present in the volume of monitoring characterized in that the transponder is switched on automatically in a state of sleep outside the phases active transponder and in that the central unit selectively matches with said transponder.

Une phase active correspond à un état actif de réception et de traitement d'un signal envoyé par l'unité centrale et, éventuellement, un état actif d'émission d'un message en réponse audit signal. Le signal envoyé par l'unité centrale peut être un signal de demande de présence et le signal de réponse envoyé par le transpondeur un message codé de confirmation de présence du transpondeur dans le volume à surveiller.An active phase corresponds to an active state of reception and processing of a signal sent by the unit central unit and, optionally, an active transmission state of a message in response to said signal. The signal sent by the central unit can be a request signal for presence and the response signal sent by the transponder a coded message of confirmation of presence of the transponder in the volume to be monitored.

Le rapport entre la durée d'une phase active et le temps de cycle de fonctionnement sera très faible et, de préférence, inférieur à 10 %, de manière à conférer aux transpondeurs une grande autonomie d'énergie.The relationship between the duration of an active phase and the operating cycle time will be very short and preferably less than 10%, so as to give with transponders a great autonomy of energy.

L'unité centrale est constitué d'un circuit d'émission/réception, d'une interface comprenant une mémoire tampon permettant la liaison radiofréquence de l'unité centrale avec plusieurs transpondeurs, d'un microcontrôleur et des mémoires contenant les algorithmes, sous forme de programmes informatiques, des différents modes de fonctionnement du détecteur.The central unit consists of a circuit transmission / reception, an interface comprising a buffer memory allowing the radio frequency link of the central unit with several transponders, one microcontroller and memories containing the algorithms, in the form of computer programs, different detector operating modes.

Les transpondeurs comprennent dans un premier mode de réalisation un microcontrôleur et des mémoires, un circuit d'émission/réception et une interface comprenant une mémoire tampon permettant la liaison avec plusieurs contrôleurs.The transponders include in a first embodiment a microcontroller and memories, a transmission / reception circuit and an interface comprising a buffer memory allowing the connection with several controllers.

Les transpondeurs comprennent dans un deuxième mode de réalisation un circuit d'émission/réception et une mémoire intelligente apte, lors d'une réception d'une impulsion envoyée par l'unité centrale, à envoyer via ledit circuit d'émission/reception une information codée contenue dans sa mémoire à l'unité centrale.Transponders include in a second embodiment a transmission / reception circuit and a smart memory suitable, when receiving a pulse sent by the central unit, to be sent via said transmission / reception circuit coded information contained in its memory to the central unit.

Conformément à l'invention le détecteur électronique comporte:

  • un mode étalonnage dans lequel l'unité centrale détecte les transpondeurs qui se trouvent dans son volume de surveillance et les identifie dans sa mémoire parmi les transpondeurs qui y sont référencés
  • un mode protection dans lequel l'unité centrale questionne successivement en boucle les transpondeurs référencés et identifiés dans sa mémoire et émet une alarme si l'un desdits transpondeurs ne répond pas, et
  • un mode détection dans lequel l'unité centrale questionne successivement en boucle les transpondeurs référencés et déclenche une alarme dès que l'un desdits transpondeurs répond et ce, par exemple, jusqu'à intervention de l'utilisateur ou jusqu'à ce que l'unité centrale ait détecté tous lesdits transpondeurs.
In accordance with the invention, the electronic detector comprises:
  • a calibration mode in which the central unit detects the transponders which are in its monitoring volume and identifies them in its memory among the transponders which are referenced therein
  • a protection mode in which the central unit successively questions the transponders referenced and identified in its memory and issues an alarm if one of said transponders does not respond, and
  • a detection mode in which the central unit successively questions the transponders referenced in a loop and triggers an alarm as soon as one of said transponders responds, for example until user intervention or until the central unit has detected all of said transponders.

Le détecteur selon la présente invention peut en outre comporter un mode d'initialisation destiné à introduire de nouveaux transpondeurs et donc à modifier la mémoire de référencement des transpondeurs. Ce mode utilise le temps prévu en début de trame d'interrogation des transpondeurs pour initialiser le nouveau transpondeur et le référencer en mémoire en vue de son identification et de sa surveillance, les autres transpondeurs référencés et identifiés étant, dans ce mode, et à cet espace temps en veille.The detector according to the present invention can further include an initialization mode intended for introduce new transponders and therefore modify the transponder referencing memory. This mode uses the time provided at the start of the interrogation frame transponders to initialize the new transponder and reference it in memory for identification and its monitoring, the other referenced transponders and identified being, in this mode, and at this time space Standby.

Le détecteur selon l'invention peut également comporter un mode d'effacement de la mémoire des transpondeurs que l'utilisateur ne souhaite pas conserver.The detector according to the invention can also include a mode for erasing the memory of transponders that the user does not wish to keep.

L'unité centrale peut comporter avantageusement des moyens tels que des témoins lumineux ou un écran d'affichage alpha-numérique permettant d'informer l'utilisateur à chaque mode de fonctionnement du détecteur, par exemple dans le cas de l'introduction d'un nouveau transpondeur, lui confirmant que celui-ci a bien été référencé dans la mémoire de l'unité centrale, puis identifié pour être surveillé.The central unit can include advantageously means such as indicator lights or an alpha-numeric display screen allowing to inform the user of each operating mode of the detector, for example in the case of introduction a new transponder, confirming that it has has been referenced in the memory of the central unit, then identified to be monitored.

Toujours conformément à l'invention les transpondeurs sont aptes à être intégrés chacun dans un objet à surveiller ou se présentent chacun sous la forme d'une étiquette électronique solidarisable audit objet et chaque transpondeur est alimenté en énergie de manière autonome ou par l'unité centrale.Still in accordance with the invention the transponders are capable of being integrated each into a object to monitor or are each in the form an electronic tag that can be joined to said object and each transponder is supplied with energy so autonomous or by the central unit.

Les avantages et les caractéristiques de la présente invention ressortiront plus clairement de la description qui suit et qui se rapporte au dessin annexé, lequel en représente plusieurs modes de réalisation non limitatifs.

  • la figure 1 est une représentation schématique du dispositif selon l'invention.
  • la figure 2 représente le schéma fonctionnel de l'unité centrale et d'un transpondeur.
  • la figure 3a représente l'état des registres de la mémoire de l'unité centrale pour un cas particulier de fonctionnement du dispositif selon l'invention.
  • la figure 3b représente le diagramme temporel en mode protection du dispositif selon l'invention.
  • la figure 4a représente un algorithme du mode initialisation
  • la figure 4b représente un algorithme du mode protection
  • la figure 4c représente un algorithme du mode détection
  • la figure 4d représente un algorithme du mode effacement des mémoires
  • la figure 4e représente un algorithme du mode étalonnage.
The advantages and characteristics of the present invention will emerge more clearly from the description which follows and which refers to the appended drawing, which represents several non-limiting embodiments.
  • Figure 1 is a schematic representation of the device according to the invention.
  • Figure 2 shows the block diagram of the central unit and a transponder.
  • FIG. 3a represents the state of the registers of the memory of the central unit for a particular case of operation of the device according to the invention.
  • FIG. 3b represents the time diagram in protection mode of the device according to the invention.
  • FIG. 4a represents an algorithm of the initialization mode
  • Figure 4b shows a protection mode algorithm
  • FIG. 4c represents an algorithm of the detection mode
  • FIG. 4d represents an algorithm of the memory erasure mode
  • FIG. 4e represents an algorithm of the calibration mode.

Si on se réfère à la figure 1 on peut voir qu'un dispositif de détection d'objets selon l'invention comprend une unité centrale 1 échangeant des informations 10 avec des transpondeurs 11 associés chacun à un objet, non représenté, aux fins de contrôler leur présence dans un volume définie 12.If we refer to Figure 1 we can see an object detection device according to the invention comprises a central unit 1 exchanging information 10 with transponders 11 each associated with an object, not shown, for the purpose of checking their presence in a defined volume 12.

L'unité centrale 1 gère ainsi les communications de vérification de présence des transpondeurs 11 dans le volume de surveillance 12 et, en cas d'absence de l'un d'entre eux, déclenche une alarme sonore 13.The central unit 1 thus manages the presence verification communications transponders 11 in monitoring volume 12 and, in if one of them is absent, triggers an alarm sound 13.

On peut voir sur la figure 2 qu'une unité centrale 1 comporte un circuit d'émission/réception 20, relié à une antenne 21, connecté à une interface 20' permettant la liaison avec plusieurs transpondeurs 11, et un microcontrôleur 22 connecté d'une part à l'interface 20 et d'autre part à une mémoire morte 23 contenant le programme informatique intégrant les algorithmes des différents modes de fonctionnement (visibles sur les figures 4a à 4e) du dispositif, et à une mémoires vive 23' destinée à contenir des paramètres inhérents aux transpondeurs 11, un buzzer 24 pour l'émission de l'alarme sonore 13 et une ou plusieurs LED 25 pour l'émission d'un signal d'alarme lumineux permettant de donner à l'utilisateur des informations sur le fonctionnement du dispositif.We can see in Figure 2 that a unit central unit 1 comprises a transmission / reception circuit 20, connected to an antenna 21, connected to an interface 20 ' allowing the connection with several transponders 11, and a microcontroller 22 connected on the one hand to the interface 20 and on the other hand to a read only memory 23 containing the computer program integrating the algorithms of different operating modes (visible on Figures 4a to 4e) of the device, and to a random access memory 23 ' intended to contain parameters inherent in transponders 11, a buzzer 24 for issuing the alarm sound 13 and one or more LED 25 for the emission of a luminous alarm signal allowing to give to user information about how the device.

Chaque transpondeur 11 est constitué d'un microcontrôleur 30 relié à circuit d'émission/réception 31, connecté à une antenne 32, et à des mémoires 33, contenant les caractéristiques du transpondeur 11 et notamment des informations codées destinées à être envoyées à l'unité centrale à sa demande, et deux compteurs d'unité de temps 34,34'.Each transponder 11 consists of a microcontroller 30 connected to transmission / reception circuit 31, connected to an antenna 32, and to memories 33, containing the characteristics of the transponder 11 and in particular coded information intended to be sent to the central unit at its request, and two 34.34 'time unit counters.

L'émetteur des circuits d'émission/réception 20,31 comprend, non représentés, une entrée de données numériques et un circuit d'émission destiné à émettre de préférence des informations numériques, dans une gamme de fréquence supérieure à environ 400 Mghz, à des distances de l'ordre de plusieurs mètres et notamment de 1 à environ 120m. Le récepteur quant à lui peut utiliser une structure de type superhétérodyne avec deux mélangeurs permettant la récupération des informations provenant de l'unité centrale soit sous forme analogique soit sous forme numérique. Il peut également être adapté pour émettre un signal de détection de porteuse indiquant qu'une réception va s'effectuer.The transmitter of the transmission / reception circuits 20.31 includes, not shown, a data entry digital and a transmission circuit for transmitting preferably digital information, in a range of frequency higher than about 400 Mghz, at distances of the order of several meters and in particular from 1 to approximately 120m. The receiver can use a structure superheterodyne type with two mixers allowing the retrieving information from the unit central unit either in analog form or in form digital. It can also be adapted to issue a carrier detection signal indicating reception will happen.

Le détecteur selon l'invention fonctionne sous trois modes de fonctionnement principaux selectionnables à partir de l'unité centrale 1:

  • un mode étalonnage dans lequel l'unité centrale questionne successivement suivant une certaine base de temps tous les transpondeurs 11 référencés dans sa mémoire 23, et mémorise à chaque transpondeur questionné et référencé une information, par exemple sous la forme d'un bit d'activité mis à "1", comme on peut le voir sur la figure 3, signifiant la présence du transpondeur 11 dans le volume 12 à surveiller. On peut voir également sur cette figure que seuls les transpondeurs TR1,TR2,TR4 et TR7 ont leur bit d'activité à "1". L'utilisateur vérifiera la bonne marche et le résultat de l'étalonnage grâce aux LED 25. Les transpondeurs 11 sélectionnés resteront en mémoire tant que l'on n'aura pas effectué un autre mode étalonnage,
  • un mode protection dans lequel l'unité centrale 1 questionne successivement, dans l'ordre de mémorisation des transpondeurs 11 référencés dans sa mémoire 23 et suivant une certaine base de temps, les transpondeurs 11, où seuls parmi les transpondeurs TR1,TR2,TR4, et TR7 référencés, comme on peut le voir sur la figure 3a, les transpondeurs TR1,TR2,TR4 et TR7 qui possèdent un bit d'activité à "1" sont questionnés, et déclenche l'alarme 13 si l'un des transpondeur dont le bit d'activité est à "1" ne répond pas par l'émission d'un code déterminé, signifiant sa sortie du volume de surveillance 12,
  • un mode détection dans lequel l'unité centrale 1 questionne selon le même principe que décrit précédemment tous les transpondeurs référencés et déclenche l'alarme 13 à chaque réponse d'un transpondeur et l'élimine de la boucle d'interrogation, ceci jusqu'à l'intervention de l'utilisateur ou lorsque la détection de tous les transpondeurs référencés a été effectuée,
   et deux modes de paramétrage, un mode d'initialisation et un mode d'effacement des mémoires.The detector according to the invention operates under three main operating modes selectable from the central unit 1:
  • a calibration mode in which the central unit successively questions, over a certain time base, all the transponders 11 referenced in its memory 23, and stores information on each transponder questioned and referenced information, for example in the form of an activity bit set to "1", as can be seen in FIG. 3, signifying the presence of the transponder 11 in the volume 12 to be monitored. It can also be seen in this figure that only the transponders TR1, TR2, TR4 and TR7 have their activity bit at "1". The user will check the correct operation and the result of the calibration using the LEDs 25. The transponders 11 selected will remain in memory until another calibration mode has been carried out,
  • a protection mode in which the central unit 1 successively questions, in the order of memorizing the transponders 11 referenced in its memory 23 and according to a certain time base, the transponders 11, where only among the transponders TR1, TR2, TR4, and TR7 referenced, as can be seen in FIG. 3a, the transponders TR1, TR2, TR4 and TR7 which have an activity bit at "1" are queried, and triggers alarm 13 if one of the transponders whose the activity bit is at "1" does not respond by the emission of a determined code, signifying its exit from the monitoring volume 12,
  • a detection mode in which the central unit 1 questions on the same principle as described above all the referenced transponders and triggers the alarm 13 on each response from a transponder and eliminates it from the interrogation loop, this up to user intervention or when all the referenced transponders have been detected,
and two setting modes, an initialization mode and a memory erase mode.

Le mode détection permet ainsi de localiser un objet perdu et d'éviter tout risque d'introduction d'un transpondeur 11 surnuméraire à des fins de substitution malveillante ou de piratage d'un transpondeur référencé et étalonné de même codage.The detection mode thus makes it possible to locate a lost object and avoid any risk of introducing a supernumerary transponder 11 for substitution purposes malicious or hacking of a referenced transponder and calibrated with the same coding.

Si on se réfère à la figure 3b on peut voir un cycle de fonctionnement du dispositif dans le mode protection où par souci de simplicité et de compréhension le temps est découpé en secondes et 10ème de secondes. Lors de l'enclenchement du mode protection, l'unité centrale 11 envoi une impulsion en 40 qui déclenche simultanément les compteurs de temps 34 de chaque transpondeurs TR1,TR2,TR4,TR7, puis chaque compteur de temps, après une durée déterminée et différente d'un transpondeur à l'autre, va mettre en état actif, en 41, de réception du signal de demande de présence envoyé par l'unité centrale 1 le transpondeur TR1,TR2,TR4 ou TR7 correspondant qui, s'il est questionné durant son temps de réveil par l'unité centrale, lui répond par l'envoi d'un message codé 42 signifiant sa présence dans le volume de surveillance. Puis ce transpondeur est alors automatiquement mis en sommeil pendant une certaine durée 43 au moyen du deuxième compteur d'unité de temps 34'. En fin de période de sommeil, les transpondeurs réactivent leur compteur 34 à réception d'une impulsion 44 de l'unité centrale 1, puis se réveille en fin de comptage du compteur et, s'ils reçoivent pendant leur temps de réveil une impulsion 46 de l'unité centrale 1 lui envoi en retour un message codé 42 significatif de leur présence. On peut voir ainsi sur la figure 3b qu'après le réveil simultané de tous les transpondeurs TR1,TR2,TR4 et TR7 par l'envoi d'une impulsion 40 par l'unité centrale 1 le transpondeur TR4 est réveillé en dernier mais est questionné en premier par l'unité centrale 1 et émet alors en réponse à cette dernière un code d'identification 42 puis c'est le transpondeur TR4 qui est sollicité par l'unité centrale pour justifier de sa présence, puis successivement les transpondeur TR2 et TR1.If we refer to Figure 3b we can see an operating cycle of the device in the protection mode where for the sake of simplicity and understanding the time is divided into seconds and 10 th of a second. When the protection mode is engaged, the central unit 11 sends a pulse at 40 which simultaneously triggers the time counters 34 of each transponder TR1, TR2, TR4, TR7, then each time counter, after a determined and different duration from one transponder to another, will put in active state, at 41, of reception of the presence request signal sent by the central unit 1, the corresponding TR1, TR2, TR4 or TR7 transponder which, if questioned during its awakening time by the central unit, responds to it by sending a coded message 42 signifying its presence in the monitoring volume. Then this transponder is then automatically put to sleep for a certain period 43 by means of the second time unit counter 34 '. At the end of the sleep period, the transponders reactivate their counter 34 on receipt of a pulse 44 from the central unit 1, then wake up at the end of counting of the counter and, if they receive a pulse 46 during their waking time. from the central unit 1 sends back a coded message 42 indicative of their presence. It can thus be seen in FIG. 3b that after the simultaneous awakening of all the transponders TR1, TR2, TR4 and TR7 by the sending of a pulse 40 by the central unit 1 the transponder TR4 is last awakened but is questioned first by the central unit 1 and then sends in response to the latter an identification code 42 then it is the transponder TR4 which is requested by the central unit to justify its presence, then successively the transponder TR2 and TR1 .

On peut voir également sur la figure 3B la présence du mode initialisation 47 en début de trame, au cours duquel tous les transpondeurs référencés sont état de veille, destiné à permettre l'introduction de nouveaux transpondeurs dans la mémoire 23' de l'unité centrale 1.We can also see in Figure 3B the presence of initialization mode 47 at the start of the frame, during which all the referenced transponders are state standby, intended to allow the introduction of new transponders in the memory 23 'of the central unit 1.

Les transpondeurs peuvent être intégrés à un objet à protéger tel qu'une carte à puce destinée à des applications bancaires en respectant les contraintes de surface et d'épaisseur, ou peuvent par exemple se présenter sous la forme d'une étiquette électronique indépendante solidarisable, par exemple par collage, à l'objet à protéger.Transponders can be integrated into a object to be protected such as a smart card intended for banking applications respecting the constraints of surface and thickness, or can for example be present in the form of an electronic label independent, can be joined together, for example by bonding, to the object to protect.

Pour une plus grande sécurité du dispositif, les communications entre l'unité centrale et les transpondeurs seront cryptées.For greater security of the device, communications between the central unit and the transponders will be encrypted.

On notera qu'un compteur d'absence peut être mis en place pour que l'unité centrale ne déclenche son alarme qu'au bout de n absences, évitant ainsi les alarmes intempestives.Note that an absence counter can be set up so that the central unit does not trigger its alarm only after n absences, thus avoiding alarms untimely.

L'unité centrale peut être intégrée dans un appareil du type téléphone portable ou autre et être en conséquence alimentée par la batterie de ce dernier.The central unit can be integrated into a cell phone or other device and be in consequence powered by the latter's battery.

Claims (9)

  1. Electronic sensor, in particular aimed at detecting the theft or the loss of objects, of the type including an electronic central unit (1) exchanging coded data by radio-frequency with at least one transponder (11) associated with an object to be monitored, with a view to checking its presence within a defined volume (12) and transmitting an alarm (13) when said transponder (11) is no longer present within the volume to be monitored (12), characterised in that said transponder (11) is automatically put in stand-by, except in the active phases of said transponder (11), and in that the central unit (1) selectively corresponds with said transponder.
  2. Sensor according to claim 1, characterised in that it includes :
    a calibration mode in which the central unit (1) detects the transponders (TR1, TR2, TR4, TR7) that are present within its volume to be monitored (12) and identifies them in its memory among the transponders (11) referenced in it,
    a protection mode in which the central unit (1) successively interrogates in a loop the transponders (TR1, TR2, TR4, TR7) referenced and identified in its memory (23') and sends an alarm (13) when one of said transponders (11) does not answer, and
    a detection mode in which the central unit (1) successively interrogates in a loop the referenced transponders (11) and sends an alarm (13) as soon as one of said transponders answers.
  3. Sensor according to claim 2, characterised in that it includes, in addition, an initialisation mode for inserting new transponders by using the time provided for at the beginning of the period of interrogation of the transponders (11) to initialise the new transponder and to reference it in the memory, with a view to identifying it and to monitoring it, the other referenced and identified transponders (11) being, in this mode and during this period of time, in stand-by.
  4. Sensor according to any of the preceding claims, characterised in that it includes means (25) allowing informing the user in each operation mode of the sensor.
  5. Sensor according to any of the preceding claims, characterised in that the transponders (11) include a microcontroller (22) and memories (23, 23') and a transmission/reception circuit (20).
  6. Sensor according to any of claims 1 to 4, characterised in that the transponders (11) include a transmission/reception circuit (20) and an intelligent memory capable, when receiving an impulse sent by the central unit, of sending via said transmission/reception circuit coded data contained in its memory to the central unit (1).
  7. Sensor according to any of the preceding claims, characterised in that the transponders (11) are capable of being integrated each into an object to be monitored or are in the form of an electronic label that can be made integral with said object and in that each transponder (11) is supplied with energy in an autonomous way or by the central unit.
  8. Sensor according to any of the preceding claims, characterised in that the communications between the central unit (1) and the transponders (11) are encrypted.
  9. Sensor according to any of the preceding claims, characterised in that it includes an absence meter, so that the central unit triggers an alarm (13) only after n absences.
EP99909006A 1998-03-12 1999-03-12 Electronic sensor for identifying objects to prevent them from being lost, stolen or moved Expired - Lifetime EP1064632B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9803412A FR2776100B1 (en) 1998-03-12 1998-03-12 ELECTRONIC SYSTEM FOR IDENTIFYING OBJECTS TO PREVENT LOSS, THEFT OR DISPLACEMENT
FR9803412 1998-03-12
PCT/FR1999/000562 WO1999046743A1 (en) 1998-03-12 1999-03-12 Electronic sensor for identifying objects to prevent them from being lost, stolen or moved

Publications (2)

Publication Number Publication Date
EP1064632A1 EP1064632A1 (en) 2001-01-03
EP1064632B1 true EP1064632B1 (en) 2003-07-16

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EP99909006A Expired - Lifetime EP1064632B1 (en) 1998-03-12 1999-03-12 Electronic sensor for identifying objects to prevent them from being lost, stolen or moved

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EP (1) EP1064632B1 (en)
JP (1) JP2002507036A (en)
AT (1) ATE245294T1 (en)
CA (1) CA2322710A1 (en)
DE (1) DE69909602T2 (en)
ES (1) ES2207934T3 (en)
FR (1) FR2776100B1 (en)
WO (1) WO1999046743A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPQ902900A0 (en) * 2000-07-27 2000-08-17 Stephen-Daly, Paul Deterrent device for theft or unauthorised use of appliances
US8680999B2 (en) 2010-12-13 2014-03-25 Welch Allyn, Inc. Loss prevention system
WO2014134046A1 (en) 2013-02-27 2014-09-04 Welch Allyn, Inc. Anti-loss for medical devices

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3618416A1 (en) * 1986-05-31 1987-12-03 Friedrich Dipl Ing Mebes Device for monitoring items of baggage or the like
US4855713A (en) * 1988-10-07 1989-08-08 Interactive Technologies, Inc. Learn mode transmitter
US5099226A (en) * 1991-01-18 1992-03-24 Interamerican Industrial Company Intelligent security system
DE4239702C1 (en) * 1992-11-26 1994-03-24 Grundig Emv Method for monitoring and operating a radio link between the central unit of an alarm system and its outstations containing monitoring sensors
US5396218A (en) * 1993-07-23 1995-03-07 Olah; George Portable security system using communicating cards
US5525967A (en) * 1993-11-01 1996-06-11 Azizi; S. Massoud System and method for tracking and locating an object
DE9420940U1 (en) * 1994-12-30 1995-02-23 Huang, Dennis, Taipeh/T'ai-pei Reminder system
US5771002A (en) * 1997-03-21 1998-06-23 The Board Of Trustees Of The Leland Stanford Junior University Tracking system using radio frequency signals

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ES2207934T3 (en) 2004-06-01
ATE245294T1 (en) 2003-08-15
WO1999046743A1 (en) 1999-09-16
FR2776100A1 (en) 1999-09-17
JP2002507036A (en) 2002-03-05
DE69909602D1 (en) 2003-08-21
FR2776100B1 (en) 2000-08-25
CA2322710A1 (en) 1999-09-16
EP1064632A1 (en) 2001-01-03
DE69909602T2 (en) 2004-04-15

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