WO1994019781A1 - Systeme d'identification servant a detecter une pluralite de repondeurs d'identification dans un champ d'interrogation et a determiner leurs positions - Google Patents

Systeme d'identification servant a detecter une pluralite de repondeurs d'identification dans un champ d'interrogation et a determiner leurs positions Download PDF

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Publication number
WO1994019781A1
WO1994019781A1 PCT/NL1994/000038 NL9400038W WO9419781A1 WO 1994019781 A1 WO1994019781 A1 WO 1994019781A1 NL 9400038 W NL9400038 W NL 9400038W WO 9419781 A1 WO9419781 A1 WO 9419781A1
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WO
WIPO (PCT)
Prior art keywords
transponder
detection system
signal
antenna
transponders
Prior art date
Application number
PCT/NL1994/000038
Other languages
English (en)
Inventor
Harm Jacob Kip
Original Assignee
N.V. Nederlandsche Apparatenfabriek Nedap
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 N.V. Nederlandsche Apparatenfabriek Nedap filed Critical N.V. Nederlandsche Apparatenfabriek Nedap
Publication of WO1994019781A1 publication Critical patent/WO1994019781A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
    • G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
    • G06K7/10039—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot interrogator driven, i.e. synchronous

Definitions

  • the invention relates to a detection system for identifying an electronic transponder, the system comprising a transmitter unit and at least one transmitting antenna coupled thereto for generating an electromagnetic interrogation field and a detection unit for detecting signals emitted by the transponders when they are located in the interrogation field.
  • Such a system is for instance disclosed in U.S. Patent 4,459,474.
  • This system may comprise two receiving antennas which enable the movement of a transponder to be determined.
  • the system may comprise means for separating from each other transponder signals which are emitted by different transponders and are emitted at least temporarily simultaneously, on the basis of phase relations between the bit data of these transponder signals. In practice, this proves to be a costly method.
  • the object of the invention is to provide a system which makes it possible in a simple manner for simultaneously emitted transponder signals to be distinguishably detected. More specifically, the object of the invention is to provide a system whereby moreover the position of a transponder can be determined.
  • the detection unit to this end comprises means for detecting the transponder signals coming from different transponders on the basis of strength differences between these signals. The invention is based on the insight that different transponder signals can often be received with a different strength.
  • the detection unit comprises at least one receiver unit having at least one small receiving antenna coupled thereto, the receiving antenna having such a small size that strength differences arise between received transponder signals coming from different transponders.
  • European patent specification 0,285,419 discloses a system where entire search trees are traversed to select one of the transponders present. After a first transponder has been selected, a next transponder is selected, and so forth, until all transponders have been selected.
  • a drawback of this method is that, on the one hand, the transponders become very complicated and, on the other, the readout time becomes very long.
  • Another known solution provides a transponder incorporating an arbitrary interval after it has transmitted a code. During this interval the transponder does not transmit any codes. Because of the arbitrary nature of the intervals, whose duration is preferably between, for instance, 3 and 10 times the period for emitting a code, occasionally a situation will arise where only one of the transponders present is active. This transponder can then be simply detected.
  • a disadvantage of this system is that on average it takes very long for a transponder to be identified on the basis of the emitted code. This disadvantage does not outweigh the advantage that such a system can be realized relatively easily.
  • the invention provides a solution for the detection of several transponders within a single interrogation field, without the transponders becoming more complex and without additional time being required for the detection of several responders.
  • a particular embodiment of the identification system according to the invention is characterized in that the detection unit further comprises a data processing unit for processing received signals obtained by means of a receiver unit and that the data processing unit processes the strengths of the received transponder signals in combination for determining a position and/or rotative orientation of a transponder.
  • the signal strength of the received signal is related to the distance between the transponder and the antenna.
  • German Offenlegungsschrift 3,714,263 describes a localizing system whereby locally a large field gradient is created by controlling two transmitting coils in opposite phase. The sharp mimimum of the field strength equals zero, so that at a well- defined point the transponder momentarily stops generating a code. It is clear that this is not a good method of identifying and localizing several transponders simultaneously.
  • orientation of the transponder affects the outcome of the determination of the position, which may cause errors if the transponders are freely movable.
  • orientation of the transponder can be determined as well, though often with a limited accuracy.
  • the solution according to the invention is sufficiently accurate to solve the above-mentioned sequence problem such as may occur, for instance, in access control with ski-lifts.
  • the invention starts from the assumption that there are clearly measurable strength differences between the signals being received. This means that the number of transponders that can be read out simultaneously is limited. In practical applications this is not a limitation; because of the physical dimensions of those carrying the transponders, rarely more than, for instance, three transponders can be present within the range of the transmitter and receiver units.
  • the invention will be further elucidated with reference to the drawing. In the drawing:
  • Fig. 1 shows a known identification system
  • Fig. 2 shows a first embodiment of an identification system according to the invention
  • Fig. 3 shows a second embodiment of an identification system according to the invention
  • Fig. 4 shows a third embodiment according to the invention.
  • reference numeral 1 denotes a known identification system.
  • the detection system 1 comprises a large antenna 2 which is coupled to a transceiver unit 4.
  • an interrogation field is emitted in which in this case a first and a second transponder 6, 8 are located.
  • the transponders 6, 8 are of a generally known type which emits a signal when it is introduced into the interrogation field.
  • the transponder draws energy for its operation from the interrogation field.
  • the transponder it is also possible for the transponder to comprise, for instance, a battery.
  • the signal emitted by a transponder comprises a code associated with this transponder, .by which a transponder can be identified.
  • a transponder signal emitted by a transponder 6, 8 is received by the transceiver unit 4 by way of the antenna 2.
  • the received signals are subsequently transmitted to a data processing unit 10 for further processing the received signals.
  • the data processing unit is inter alia adapted for identifying transponder codes present in the received signals.
  • the two transponders 6, 8, which are located above antenna 2 are spatially far apart from each other, they yet have substantially the same distance LI, L2 to the antenna 2.
  • the strength, i.e. the amplitude, of the signals caused in the antenna 2 by the two transponders 6, 8 will be little different.
  • neither of the transponders can be identified by the receiver unit 4 and the data processing unit 10.
  • the reference numeral 12 denotes a first embodiment of an identification system according to the invention, which meets the above objections. Parts corresponding with Fig. 1 have been provided with the same reference numerals.
  • the system 12 comprises a transmitter unit 14 and a transmitting antenna 18 connected therewith through line 16. By means of the transmitter unit 14, by way of the antenna 18 an interrogation field is emitted in which in this case the transponders 6, 8 are located.
  • the system 12 further comprises a small receiving antenna 20 and a receiver unit 24 connected therewith through line 22.
  • a signal received and demodulated by the receiver unit 24 is supplied to a data processing unit 10 of a type as described with reference to Fig. 1.
  • the transmitter unit 14, antenna 18, receiver unit 24 and the data processing unit 10 are all of a generally known type.
  • the strength of the received signal coming from the first transponder 6 will be much less than the strength of the received signal coming from the second transponder 8.
  • this fact is used to distinguish from each other the received transponder signals coming from different transponders. Because the signal coming from the second transponder is much greater than the signal coming from the first transponder, the signal coming from the second transponder can be straightforwardly detected. This is a major advance compared with the system according to Fig. 1, because in the latter system neither transponder could be detected. Because of the small antenna 20, however, less signal is received than with the antenna 2, but also fewer interference signals, so that yet a good signal-to- noise ratio can be realized with very small, in an extreme case almost point-shaped, receiving antennas.
  • a transponder comprises a series resonance circuit, so that the transponder can draw its energy from the interrogation field
  • the distance between the transponder and the transmitting antenna 18 also affects the magnitude of the amplitude, i.e. the strength of the received transponder signal.
  • the frequency of the signal emitted by a transponder will often depend on the frequency of the interrogation field.
  • the receiver unit 24 can be tuned to a receiving frequency band which is dependent on the interrogation field emitted by the transmitter unit 1 .
  • a signal representing the frequency or frequencies of the interrogation field is supplied to the receiver unit 24 through line 26.
  • the own noise contribution of a signal amplifier of the receiver unit 24 is of importance.
  • a small antenna 20 there is in most cases a substantial difference in the distance between transponders located in different positions and the small antenna 20. Because the strength of the received signal is affected not only by the distance to the receiving antenna but also by the rotative position of a transponder 6, 8, it may still happen that the strength differences of the transponder signals are still too slight for proper detection.
  • Fig. 3 shows a particular embodiment of a system 28 according to the invention, which meets the last-mentioned drawbacks. Parts corresponding with Fig. 2 have been provided with the same reference numerals.
  • the system 28 comprises a second small receiving antenna 30 which is connected with a second receiver unit 34 through line 32.
  • the signals received by the second receiver unit 34 are also supplied to a data processing unit 10.
  • both the signals received by the first receiver unit and the signals received by the second receiver unit are supplied to one and the same data processing unit 10.
  • this is not essential to the invention.
  • the distance L3 between the first transponder 6 and the second receiving antenna 20 is smaller than the distance between the second transponder 8 and the second receiving antenna 30.
  • the first transponder 6 will generate the strongest signal in the second receiving antenna 30, while the second transponder 8 will generate the strongest signal in the first receiving antenna 20. Accordingly, the first receiving unit can detect the second transponder, while the second receiver unit can detect the first transponder. The signals thus received are supplied to the data processor 10 for identifying the codes emitted by the transponders.
  • the second receiving antenna increases the chances that in any case one of the two transponders in this example is identified and that possibly even two transponders can be identified simultaneously.
  • the addition of small receiving antennas to a detection system according to the invention increases the probability of being identified for every transponder.
  • a third or even fourth receiving antenna coil creates a situation where nearly always at least one receiving antenna receives such a strength difference as to enable detection of the strongest signal of any transponder. Receiving a strongest signal by means of one receiving antenna and one receiver unit is essentially nothing other than what is done with the existing technique in one receiver unit with one (large) antenna.
  • the small receiving antennas according to the invention create in at least substantially every receiver unit a greater difference in signal strength between the received signals coming from different transponders.
  • FIG. 4 diagrammatically shows an identification system with n receiving antenna 20.i and n receiver units 24.i, with n and i being integers greater than or equal to 1, and 0 ⁇ i ⁇ n+l. If n is great while a plurality of transponders are located in the interrogation field, there is a good chance that the signal emitted by an arbitrary transponder is received as the strongest signal in at least one receiving antenna.
  • the receiving antennas 20, 30, 20.i, described with reference to Figs. 2-4, are qualified as small. This is meant to say that the receiving antennas are so small that strength differences between signals coming from different transponders are enlarged.
  • the dimensions of the receiving antenna are small relative to the maximum distance at which a transponder located in an interrogation field can be detected. In accordance with a possible embodiment, the dimensions of the receiving antenna are small relative to a cross section of the area in which a transponder can be detected. The magnitude of this detection area depends inter alia on the power of the transmitter unit 14, the frequency of the interrogation field generated by the transmitter unit 14 and the geometry of the transmitting antenna 18. In accordance with another embodiment, dimensions of the receiving antenna are small relative to the dimensions of the transmitting antenna 18. By 'small relative to' is meant, for instance, smaller by at least a factor of four. Preferably, however, smaller by at least a factor of 10 is meant.
  • the receiving antennas have a ⁇ size comparable with the size of a transponder.
  • a transponder comprises a transmitting and receiving antenna coil with dimensions of the same order of magnitude as the dimensions of a receiving antenna.
  • a receiving antenna and/or a transmitting antenna 18 also consist of a coil.
  • the size of a coil can in this connection be defined, for instance, as a cross section of the surface enclosed by a winding of a coil or the square root of the area of that surface.
  • windings of a coil of a receiving antenna enclose a surface whose magnitude is approximately equal to the surface enclosed by a winding of a coil of a transponder.
  • the dimensions of the receiving antenna are much smaller than the dimensions of the transponders.
  • the transponders are often designed in the form of a credit card. The dimensions of the credit card may then be defined, for instance, as the magnitude of the flat surface of the card or the square root thereof.
  • the signal on a receiving antenna 20, 20.i, 30 is often present with a different strength on another receiving antenna as well. It is therefore also a part of the invention to examine, as soon as a code signal has been detected, whether there is a correlation between this signal and the various other signals received by means of the other receiving antennas. Such a correlation can be carried out by the data processing unit 10. Minimizing the correlation makes it easier for the other transponder codes to be detected from the residual signals.
  • the large transmitting antenna 18 is also used as a receiving antenna for this purpose. Signals received by means of the large antenna 18 can then be correlated with the signals received by means of the small receiving antennas 20, 20.i, 30 (not shown in Fig. 2, 3 or 4) .
  • a further improvement of the system is to arrange the receiving antennas on opposite sides of a passage to be guarded. Especially transponders which are located far away from all the receiving antennas arranged on one side of the passage can then be properly detected by the receiving antennas located on the other side of the passage. The code and the.strength of each transponder signal such as it enters each receiving antenna can then be determined in accordance with the invention.
  • the strength of the signal gives a set of points where a transponder may be located.
  • the strength of the received signal is determined by:
  • Each receiving antenna gives a different set of points where the transponder may be located. Such a set can be expressed in an equation with five unknowns, these unknowns always being three position-dependent coordinates (for instance x, y, z) and two rotation-dependent coordinates, which represent the rotative orientation of the transponder.
  • the starting-point is the practical case where the transponder - more precisely, the antenna coil of the transponder - has an axis of symmetry, so that its rotative position can be expressed by means of two angular coordinates.
  • the accuracy of the system can be considerably improved when it comprises more than five receiving antennas (n > 5) .
  • the analytic solution of the many equations with many unknowns is very complex.
  • a numerical solving method whereby a coarse grid of possible points where a transponder may be located is coupled to a limited number of rotative positions of the transponder provides for each antenna a limited number of possibilities for the orientation and position of the transponder. Each receiver provides such a set of possible transponder positions. The intersection of these sets then provides the actual position of the transponders. Precisely because of the complex relations that exist between the signal strengths and the position of the transponders does a solving method utilizing neural networks lead rapidly to useful results and especially the self-learning character of this solution is a particularly great advantage.
  • the inspiration for artificial neural networks is to be found in nature.
  • the structure is like a highly simplified neuron. Hence the name.
  • a neural network consists of a plurality of neurons, which are interconnected in a layered structure.
  • a neuron itself consists of a plurality of inputs with an adjustable amplification factor, followed by an adder and a limiter.
  • the output of a neuron is connected to the inputs of the neurons of the next layer.
  • the purpose is to give the adjustable amplification factors a value such that the network starts to display a desired behavior.
  • One of the most widely used learning rules is the so-called back propagation method, whereby a known pattern is presented to the input of the network.
  • the actual value of the output is compared with the desired value and in the case of a difference between them the amplification factors are corrected in accordance with an algorithm. This is repeated with many learning examples until the network displays the desired behavior for the entire learning set.
  • the neural network has now been taught and can then independently calculate an output on the basis of input values.

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Abstract

Système détecteur destiné à identifier un répondeur électronique d'identification. Le système comporte une unité émettrice à laquelle est couplée au moins une antenne émettrice afin de produire un champ d'interrogation électromagnétique. En outre, le système comporte une unité détectrice servant à détecter les signaux émis par les répondeurs lorsqu'ils se trouvent dans le champ d'interrogation. Ladite unité détectrice comporte un dispositif de détection des signaux provenant des différents répondeurs en fonction des différences entre leurs intensités.
PCT/NL1994/000038 1993-02-16 1994-02-16 Systeme d'identification servant a detecter une pluralite de repondeurs d'identification dans un champ d'interrogation et a determiner leurs positions WO1994019781A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9300290 1993-02-16
NL9300290A NL9300290A (nl) 1993-02-16 1993-02-16 Het tegelijkertijd uitlezen van meerdere detectielabels in een ondervraagveld, en het bepalen van de positie van deze labels.

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WO1994019781A1 true WO1994019781A1 (fr) 1994-09-01

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995014938A1 (fr) * 1993-11-26 1995-06-01 Magellan Technology Pty. Ltd. Dispositif permettant de localiser et procede
FR2727224A1 (fr) * 1994-11-22 1996-05-24 Innovatron Ind Sa Borne de communication sans contact avec des objets portatifs
WO1997034250A1 (fr) * 1996-03-12 1997-09-18 Gemplus S.C.A. Dispositif d'echange d'informations sans contact avec une etiquette electronique
NL1002807C2 (nl) * 1996-04-05 1997-10-07 Nedap Nv Twee responders tegelijk herkennen door PACE (Phase Alternating Code Extension).
WO1998021685A2 (fr) * 1996-11-08 1998-05-22 Siemens Nixdorf Informationssysteme Ag Analyseur de corbeille d'achat
EP0851377A1 (fr) * 1996-12-31 1998-07-01 Lucent Technologies Inc. Système de reconciliation de passagers, baggages et cargaisons
WO1998032092A1 (fr) * 1997-01-17 1998-07-23 Integrated Silicon Design Pty. Ltd. Systeme de lecture de plusieurs etiquettes
US5952922A (en) * 1996-12-31 1999-09-14 Lucent Technologies Inc. In-building modulated backscatter system
EP0967580A2 (fr) * 1998-06-23 1999-12-29 Gilbarco Inc. Arbitrage centralisé de transpondeurs
US6084530A (en) * 1996-12-30 2000-07-04 Lucent Technologies Inc. Modulated backscatter sensor system
US6130623A (en) * 1996-12-31 2000-10-10 Lucent Technologies Inc. Encryption for modulated backscatter systems
US6184841B1 (en) 1996-12-31 2001-02-06 Lucent Technologies Inc. Antenna array in an RFID system
WO2001015070A2 (fr) * 1999-08-25 2001-03-01 Pinpoint Corporation Procede et appareil de localisation d'etiquettes mobiles
AU737367B2 (en) * 1997-01-17 2001-08-16 Integrated Silicon Design Pty Ltd Multiple tag reading system
WO2005071596A2 (fr) * 2004-01-16 2005-08-04 Koninklijke Philips Electronics, N.V. Systeme et procede d'utilisation d'etiquettes d'identification par radiofrequence en tant que declencheurs d'actions
WO2005104023A1 (fr) * 2004-03-24 2005-11-03 Avery Dennison Corporation Systeme et procede pour lecture selective de dispositifs rfid
WO2007045518A1 (fr) * 2005-10-18 2007-04-26 Siemens Aktiengesellschaft Procede et dispositif d'insertion d'une memoire de donnees mobile dans la structure protocole pour la communication avec un appareil d'ecriture/lecture
WO2014081383A1 (fr) 2012-11-23 2014-05-30 Delaval Holding Ab Enregistrement d'une étiquette de transpondeur par l'intermédiaire d'un champ électromagnétique alternatif
WO2015171058A1 (fr) 2014-05-06 2015-11-12 Delaval Holding Ab Enregistrement d'une étiquette de transpondeur par l'intermédiaire d'un champ électromagnétique alternatif

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US4459474A (en) * 1981-05-18 1984-07-10 Walton Charles A Identification system with separation and direction capability and improved noise rejection
FR2544867A1 (fr) * 1983-04-21 1984-10-26 Intellitech Corp Procede et dispositif de localisation, d'identification, de mesure de deplacement, d'inventaire, d'analyse, de controle, de guidage et de tri d'objets
DE3714263A1 (de) * 1987-04-29 1988-10-20 Goetting Hans Heinrich Jun Anordnung zur standlinien- oder standortbestimmung von passiven kode- oder informationstraegern in bezug auf die identifizierungseinrichtung
WO1989006367A1 (fr) * 1988-01-11 1989-07-13 Korn Lawrence D Systeme de localisation de fichiers
WO1992022040A1 (fr) * 1991-05-28 1992-12-10 Commissariat A L'energie Atomique Systeme d'identification automatique d'objets ou d'individus par interrogation a distance

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Publication number Priority date Publication date Assignee Title
US4459474A (en) * 1981-05-18 1984-07-10 Walton Charles A Identification system with separation and direction capability and improved noise rejection
FR2544867A1 (fr) * 1983-04-21 1984-10-26 Intellitech Corp Procede et dispositif de localisation, d'identification, de mesure de deplacement, d'inventaire, d'analyse, de controle, de guidage et de tri d'objets
DE3714263A1 (de) * 1987-04-29 1988-10-20 Goetting Hans Heinrich Jun Anordnung zur standlinien- oder standortbestimmung von passiven kode- oder informationstraegern in bezug auf die identifizierungseinrichtung
WO1989006367A1 (fr) * 1988-01-11 1989-07-13 Korn Lawrence D Systeme de localisation de fichiers
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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995014938A1 (fr) * 1993-11-26 1995-06-01 Magellan Technology Pty. Ltd. Dispositif permettant de localiser et procede
FR2727224A1 (fr) * 1994-11-22 1996-05-24 Innovatron Ind Sa Borne de communication sans contact avec des objets portatifs
EP0714073A1 (fr) * 1994-11-22 1996-05-29 INNOVATRON INDUSTRIES, Société Anonyme Borne de communication sans contact avec des objets portatifs
US5670941A (en) * 1994-11-22 1997-09-23 Innovatron Industries, Societe Anonyme Terminal for contactless communication with portable objects
WO1997034250A1 (fr) * 1996-03-12 1997-09-18 Gemplus S.C.A. Dispositif d'echange d'informations sans contact avec une etiquette electronique
FR2746200A1 (fr) * 1996-03-12 1997-09-19 Gemplus Card Int Dispositif d'echange d'informations sans contact avec une etiquette electronique
NL1002807C2 (nl) * 1996-04-05 1997-10-07 Nedap Nv Twee responders tegelijk herkennen door PACE (Phase Alternating Code Extension).
WO1998021685A3 (fr) * 1996-11-08 1998-07-23 Siemens Nixdorf Inf Syst Analyseur de corbeille d'achat
WO1998021685A2 (fr) * 1996-11-08 1998-05-22 Siemens Nixdorf Informationssysteme Ag Analyseur de corbeille d'achat
US6084530A (en) * 1996-12-30 2000-07-04 Lucent Technologies Inc. Modulated backscatter sensor system
EP0851377A1 (fr) * 1996-12-31 1998-07-01 Lucent Technologies Inc. Système de reconciliation de passagers, baggages et cargaisons
EP0940763A1 (fr) * 1996-12-31 1999-09-08 Lucent Technologies Inc. Système de reconciliation de passagers, baggages et cargaisons
US5952922A (en) * 1996-12-31 1999-09-14 Lucent Technologies Inc. In-building modulated backscatter system
US6130623A (en) * 1996-12-31 2000-10-10 Lucent Technologies Inc. Encryption for modulated backscatter systems
US6184841B1 (en) 1996-12-31 2001-02-06 Lucent Technologies Inc. Antenna array in an RFID system
US6538564B1 (en) 1997-01-17 2003-03-25 Integrated Silicon Design Pty Ltd Multiple tag reading system
WO1998032092A1 (fr) * 1997-01-17 1998-07-23 Integrated Silicon Design Pty. Ltd. Systeme de lecture de plusieurs etiquettes
AU737367B2 (en) * 1997-01-17 2001-08-16 Integrated Silicon Design Pty Ltd Multiple tag reading system
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WO2001015070A2 (fr) * 1999-08-25 2001-03-01 Pinpoint Corporation Procede et appareil de localisation d'etiquettes mobiles
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WO2005071596A2 (fr) * 2004-01-16 2005-08-04 Koninklijke Philips Electronics, N.V. Systeme et procede d'utilisation d'etiquettes d'identification par radiofrequence en tant que declencheurs d'actions
WO2005104023A1 (fr) * 2004-03-24 2005-11-03 Avery Dennison Corporation Systeme et procede pour lecture selective de dispositifs rfid
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WO2007045518A1 (fr) * 2005-10-18 2007-04-26 Siemens Aktiengesellschaft Procede et dispositif d'insertion d'une memoire de donnees mobile dans la structure protocole pour la communication avec un appareil d'ecriture/lecture
WO2014081383A1 (fr) 2012-11-23 2014-05-30 Delaval Holding Ab Enregistrement d'une étiquette de transpondeur par l'intermédiaire d'un champ électromagnétique alternatif
US9418261B2 (en) 2012-11-23 2016-08-16 Delaval Holding Ab Registering of a transponder tag via an alternating electromagnetic field
WO2015171058A1 (fr) 2014-05-06 2015-11-12 Delaval Holding Ab Enregistrement d'une étiquette de transpondeur par l'intermédiaire d'un champ électromagnétique alternatif

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