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WO1997001154A1 - Etiquette et systeme de controle d'etiquettes - Google Patents

Etiquette et systeme de controle d'etiquettes Download PDF

Info

Publication number
WO1997001154A1
WO1997001154A1 PCT/GB1996/001516 GB9601516W WO9701154A1 WO 1997001154 A1 WO1997001154 A1 WO 1997001154A1 GB 9601516 W GB9601516 W GB 9601516W WO 9701154 A1 WO9701154 A1 WO 9701154A1
Authority
WO
WIPO (PCT)
Prior art keywords
tag
domain
controller
expiry
beacon
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.)
Ceased
Application number
PCT/GB1996/001516
Other languages
English (en)
Inventor
Mark Mitcheson
Robert Andrew Kevan
Mark Nicholas Grenside
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.)
MEDESTATE Ltd
Original Assignee
MEDESTATE Ltd
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
Priority claimed from GBGB9512563.9A external-priority patent/GB9512563D0/en
Priority claimed from GBGB9512562.1A external-priority patent/GB9512562D0/en
Application filed by MEDESTATE Ltd filed Critical MEDESTATE Ltd
Publication of WO1997001154A1 publication Critical patent/WO1997001154A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence

Definitions

  • the present invention relates to a tag monitoring system and to a tag for use therein.
  • One aim of the invention is to provide a system in which the location of tag holders can be detected in different regions within a building or other site.
  • a tag monitoring system comprising: a tag issue unit for issuing a plurality of tags, each tag being uniquely identifiable; a system controller for holding the identity of each issued tag with data identifying the location of that tag within a monitored volume; a plurality of beacon sets defining a domain within the monitored volume, the beacons within each set each having a transmit antenna and a receive antenna for transmitting and receiving respectively electromagnetic signals in the domain, wherein beacons within one set are arranged at different locations from beacons in the other sets to substantially avoid dead zones within the domain, and wherein the system controller comprises switching means for sequentially selecting said beacon sets to poll the domain to uniquely identify any tags within the domain and to update said location data accordingly.
  • each person to be monitored is issued with a tag which is subsequently identified when the tag wearer enters a domain.
  • a detection record can be created detailing the location of the wearer and the date and time at which detection was made.
  • each domain being defined by such a plurality of beacon sets.
  • the system controller is operable to poll all of the domain to determine the location of tags and to keep a detection record.
  • the monitored volume can be defined by a physical boundary having at least one exit zone, there being aranged at said exit zone an internal beacon set and an external beacon set on opposed sides of the exit zone in relation to the physical boundary to define a gate region.
  • the system controller is operable to poll said gate region to detect when any tags leave the monitored volume.
  • the system controller can be arranged to generate a warning signal when a tag leaves the monitored volume.
  • the system controller can comprise a domain controller for polling the or each domain and a separate data concentrater for holding up-to-date information concerning the identity of each tag and its location.
  • the data concentrater and the domain controller can be separately connected to a network which allows communication between them.
  • the tag issue unit may also be connected to that network.
  • the monitored volume can include a plurality of domains, with a plurality of domain controllers, each domain controller monitoring a plurality of said domains.
  • Each tag issued by the tag issue unit can have stored therein a unique code identifying the tag.
  • the system controller is operable to poll the or each domain by issuing a sequence of codes for transmission by the transmit antennas of the beacon sets and for awaiting any responses via the receive antennas of the beacon sets, a response being issued by a tag whose stored code matches the transmitted code.
  • the ⁇ ystem controller can hold with the identification of each tag an expiry time for that tag, the expiry time representing the time at which a holder of the tag can no longer validly remain in the monitored volume and is operable to generate an expiry signal to that tag when the expiry time is reached.
  • Tags using electromagnetic signals can be used to monitor the locations and movements of people on a site or in a building.
  • the present invention provides in another aspect a tag for use in a tag monitoring system comprising: a receiver for receiving an electromagnetic signal from a system controller; a transmitter for transmitting electromagnetic signals a ⁇ response to received signals; logic circuitry for controlling the responses of the tag; and a visual indicator controlled by the logic circuitry so that it can be activated in response to electromagnetic signals transmitted from the system controller.
  • the visual indicator can be a light-emitting diode or other light which is turned on continuously or to flash when activated.
  • Each tag can include a store holding a code uniquely identifying the tag and a comparator for comparing incoming codes from the system controller with the stored code, wherein a response is issued if the incoming code matches the stored code.
  • the present invention also provides a tag monitoring system for monitoring the locations of tags within a volume, wherein the system controller holds the identification of each tag within the monitored volume together with expiry data denoting an expiry time beyond which the holder of the tag should no longer validly remain in the monitored volume, the ⁇ ystem controller being operable to issue an expiry signal to a tag when it ⁇ expiry time i ⁇ reached, ⁇ aid expiry ⁇ ignal cau ⁇ ing the visual indicator to be activated.
  • the tag includes a store holding a unique code
  • the system controller includes a clock so that the real time can be compared with the expiry times of tag ⁇ to i ⁇ sue the expiry signal when the expiry time for an identified tag has been reached.
  • the system controller can transmit a signal to actuate the visual indicators on all tags in an emergency situation.
  • Figure 1 i ⁇ a block diagram of a tag monitoring ⁇ y ⁇ tem
  • Figure la is a diagram of a gate zone
  • Figure 2 illustrate ⁇ how a domain i ⁇ defined using beacon sets
  • Figure 3 i ⁇ a diagram repre ⁇ enting how the beacon ⁇ ets are activated in each domain
  • Figure 4 is a block diagram of elements of a domain controller
  • Figure 5 is a diagrammatic sketch indicating operation of the domain controller.
  • Figure 6 i ⁇ a block diagram of the main components of a tag for use in the system.
  • FIG. 1 is a block diagram of a tag monitoring system.
  • Reference numeral 2 denotes a communication network by means of which the components of the monitoring sy ⁇ tem are able to communicate.
  • the monitoring system comprises a tag is ⁇ ue unit 4 connected to a tag reader 6.
  • the tag i ⁇ ue unit 4 is connected to the network 2.
  • first and second domain controllers 10,12 which are each connected to the network 2.
  • There i ⁇ al ⁇ o a data concentrater 14 connected to the network 2 and four gate controllers 16,18,20,22 each connected to the network 2. It will be appreciated from the following description that the number of domain controllers and gate controllers can be selected according to the requirements of the monitoring sy ⁇ tem.
  • Each gate controller defines two zones indicated in Figure 1 as zone A and zone B.
  • the first domain controller 10 i ⁇ in communication with five domains labelled Domain A to Domain E respectively.
  • the second domain controller 12 is connected to three domains labelled Domain F to Domain H. These domains are not defined by phy ⁇ ical boundaries but by a scanning system described in more detail hereinafter.
  • Tags are i ⁇ sued at the tag is ⁇ ue unit 4.
  • Each tag includes a receiver and tran ⁇ mitter for re ⁇ pectively receiving and tran ⁇ mitting radio frequency (RF) signal ⁇ allowing the tag to communicate with the monitoring system.
  • RF radio frequency
  • An overall volume to be monitored is defined by a phy ⁇ ical boundary. That boundary ha ⁇ a ⁇ et of exit ⁇ /entrance ⁇ , each of which is monitored by a gate controller.
  • Each gate controller has two separate set ⁇ of antenna ⁇ , one monitoring zone A, for example in ⁇ ide the volume, and the other monitoring zone B, out ⁇ ide the volume.
  • Figure la i ⁇ a diagram in the region of such an exit/entrance.
  • Reference numeral 1 denotes the wall constituting the phy ⁇ ical boundary defining the exit/entrance 3.
  • Each of the domains A to H is a sub-volume within which the main volume in which tag ⁇ may be detected.
  • the domains are within the phy ⁇ ical boundary.
  • the domain ⁇ are defined by tag detection antennae (beacon ⁇ ) di ⁇ tributed throughout the volume.
  • the beacon ⁇ are arranged in a plurality of beacon ⁇ et ⁇ , with each ⁇ et comprising a plurality of beacons connected to be activated together. Depending on the size and nature of the domain to be defined, any number of beacon sets can be utilised.
  • the beacon sets are arranged so that there is full coverage throughout the domain volume.
  • Figure 2 shows a domain having two beacon sets.
  • the first beacon set BEACON SET 1 is ⁇ hown shaded on the left hand side of Figure 2 and comprise ⁇ five beacon ⁇ who ⁇ e area of coverage i ⁇ illu ⁇ trated diagrammatically by the outer circumference ⁇ of the circles.
  • Reference numeral 24 denotes a beacon.
  • the diagram on the right hand side of Figure 2 represents the second beacon set BEACON SET 2 having four beacons arranged at different locations to give a different radar coverage to that given by BEACON SET 1.
  • the monitoring system is arranged so that it is possible to detect the location of tags within the volume covered by the monitoring system. To this end, each gate zone and domain i ⁇ polled to determine whether or not tags are in the zone or domain respectively.
  • each domain controller has transmit and receive beacon ⁇ et controlling ⁇ witches 26,28 illustrated diagrammatically in Figure 3. There is a ⁇ et of ⁇ uch ⁇ witche ⁇ for each domain to be polled by the domain controller.
  • the transmit switch 26 ha ⁇ four terminal ⁇ Tl to T4 and the receive ⁇ witch ha ⁇ four terminal ⁇ Rl to R4.
  • Each beacon 24 con ⁇ ists of a tran ⁇ mit antenna A. and a receive antenna A .
  • the tran ⁇ mit antenna ⁇ A. of BEACON SET 1 are connected to the fir ⁇ t terminal Tl of the transmit switch 26.
  • the receive antennas A of the BEACON SET 1 are connected to terminal Rl of the receive switch 28.
  • the transmit antennas of BEACON SET 2 are connected to the second terminal T2 of the tran ⁇ mit ⁇ witch 26, and transmit antennas of subsequent beacon sets are connected to the remaining terminal ⁇ T3,T4.
  • the receive antennas of BEACON SET 2 are connected to the second terminal R2 of the receive switch 28.
  • the receive antennas of subsequent beacon sets are connected to the remaining receive terminals R3,R4.
  • a signal is transmitted through the tran ⁇ mit antenna ⁇ A. of the first beacon set 1 and any ⁇ ignals received are supplied to the receive switch 28 from the receive antenna ⁇ .
  • the tran ⁇ mit signal is denoted T and the received signal is denoted R .
  • the transmit and receive switche ⁇ 26,28 are connected to the ⁇ econd terminals T2,R2 and the proce ⁇ of transmitting a signal T and waiting for any receive signal R i ⁇ repeated.
  • each domain controller has a plurality of set ⁇ of tran ⁇ mit and receive ⁇ witche ⁇ 26,28, there being one set for each domain to be polled by the domain controller.
  • Figure 4 is a block diagram of the main components of each domain controller.
  • the sets of transmit and receive ⁇ witches are contained within a router 30.
  • the router 30 ha ⁇ a plurality of port ⁇ (five in the ca ⁇ e of domain controller 10 and three in the ca ⁇ e of domain controller 12) . These ports are denoted in Figure 4 as Pl to P5.
  • Each port is bidirectional and i ⁇ capable of receiving and tran ⁇ mitting signals between the domains and the domain controller.
  • the router 30 is connected via a two-way communication path to an interface 32.
  • the interface itself communicates with a microprocessor 34.
  • the microprocessor 34 is al ⁇ o connected to the network 2 via a two-way communication path 36.
  • the microprocessor 34 controls polling of the domains by the domain controller.
  • Figure 5 is a diagram for the purpose ⁇ of explaining how the microproce ⁇ or 34 operate ⁇ to control polling of domains. It will be appreciated that Figure 5 is diagrammatic only and that the proces ⁇ es and database ⁇ illustrated in Figure 5 may be organi ⁇ ed in any appropriate manner within the microprocessor 34.
  • There are a set of poll databases 40 each holding up-to-date information concerning the locations of tags is ⁇ ued by the tag i ⁇ sue unit 4.
  • Each poll database 40 holds information concerning tag IDs, the location of the tag ⁇ , the time and date.
  • a tag When a tag is first issued by the tag issue unit, its identity i ⁇ read by the tag reader 6, the ⁇ y ⁇ tem i ⁇ ⁇ et to mark the tag as active and its location is set to a default location, e.g. INSIDE.
  • a tag detection process updates the poll database ⁇ as each domain is polled.
  • the tag detection process 42 cause ⁇ the microproce ⁇ or to output ⁇ ignals to the router 30 to control connection of the transmit and receive switches 26,28 and generates the signals T to be transmitted. These signals are referred to herein as interrogation ⁇ ignals.
  • the interrogation signal ⁇ interrogate the domain which i ⁇ currently being polled and any re ⁇ ponses received from that domain are ⁇ upplied (via the router 30 and interface 32) to the tag detection proces ⁇ .
  • the interrogation signal ⁇ which are supplied during polling of each domain allow tags within that domain to be identified.
  • the poll database for each domain is continuously updated during polling of that domain.
  • a time process 44 receives data from the poll database for the domain being polled and a ⁇ certains the following:
  • the result ⁇ of the time proce ⁇ 44 are u ⁇ ed to update a plurality of valid detect database ⁇ 46, one databa ⁇ e for each domain.
  • the valid detect databa ⁇ e ⁇ hold for each tag, the tag ID, it ⁇ location, the time and date. Again ⁇ t each entry, a flag is ⁇ et to indicate whether or not there ha ⁇ been a movement of that tag since the la ⁇ t time the database was updated.
  • Information concerning movements of tags is supplied to the data concentrater 14 via a data concentrater communication process 48. When a request is made by the data concentrater for information, the data concentrater communication process accesses the valid detect databases 46 and supplie ⁇ the information concerning any flagged movements to the data concentrater.
  • tags are issued at the tag is ⁇ ue unit
  • information is supplied to the data concentrater via the network 2 concerning the tag ID and the expiry time of that tag. That is, when the tags are used to monitor the movements of persons who have paid to enter an activity centre or the like, it is desirable to allow these persons acces ⁇ only for a predetermined period of time. The time after which they no longer are permitted to remain in the activity centre i ⁇ entered as the expiry time.
  • the tag IDs and expiry times are held in an expiry database 50 within the domain controller.
  • the domains can be polled using one of the following technique ⁇ .
  • the tran ⁇ mitted ⁇ ignal T from the domain controller include ⁇ a me ⁇ age which trigger ⁇ all of the tags within the domain volume. Any tag ⁇ within the volume then issue a respon ⁇ e which identifie ⁇ each tag uniquely. When a plurality of tag ⁇ are pre ⁇ ent within the domain volumn, they i ⁇ ue re ⁇ ponses in a way which prevents them from interfering with one another, i.e. on different time slot ⁇ or on different frequencie ⁇ . This requires the use of complex detection electronics within the domain controller.
  • the ⁇ ignal T tran ⁇ mitted by the domain controller can consist of a memori ⁇ of code ⁇ , each code uniquely identifying a tag. Each tag has ⁇ tored within it a unique code which i ⁇ compared at the tag with the code transmitted by the domain controller. When the transmitted code matches the code stored within a tag, only that tag will re ⁇ pond.
  • the gates can be polled in a similar fashion. While a tag remains within zone A (i.e. the wearer does not pass through the exit/entrance zone 3 into zone B) , no change is made to the data stored at the data concentrater concerning the location of that tag. The data concentrater will already hold information for that tag concerning the domain inside the phy ⁇ ical boundary within which the tag is located. If however a tag is detected in zone B, the gate controller will immediately notify the data concentrater via the network 2 to indicate that a wearer is now outside the physical boundary.
  • the data concentrater 14 thus holds up-to-date information concerning the identity of each tag which has been issued at the tag issue unit with the location of that tag.
  • This information can be acce ⁇ ed by a file server 8 attached to the network 2 and displayed. This means that in the event of an emergency, the location of each person within the monitored volume is known. This a ⁇ i ⁇ t ⁇ fire officer ⁇ and ⁇ afety personnel in their rescue attempts. Moreover, if there is an emergency evacuation, it is pos ⁇ ible to detect, using the gate controllers, that the holders of all is ⁇ ued tag ⁇ have left the building.
  • FIG. 6 is a block diagram illustrating the main components of a tag.
  • Each tag can take the form of a watch type device to be worn on the wri ⁇ t of a wearer and has its own battery. Batteryles ⁇ tags may also be possible, activated via received ⁇ ignal ⁇ .
  • the tag comprises an RF receiver 70 for receiving transmitted signals T from the domain controller or gate controller.
  • a diode detector 72 is connected to the RF receiver 70.
  • Tran ⁇ i ⁇ tor circuitry 74 in the form of an emitter follower and common collecter prepare the received RF signal for ⁇ upply to a tag chip 76.
  • the tag chip 76 includes an A/D converter 78 which receives the analogue signal from the transistor circuitry 74 and supplies a corresponding digital signal to logic circuitry 80.
  • the logic circuitry compare ⁇ an incoming code with a code ⁇ tored on the tag and causes a response to be is ⁇ ued if there is a match between the incoming code and the ⁇ tored code.
  • the ⁇ tored code can al ⁇ o be in bar coded or human readable form on the ou ⁇ ide of the tag.
  • the logic circuitry 80 include ⁇ a memory for ⁇ toring the code and a comparator for comparing the incoming code with the ⁇ tored code.
  • the logic circuitry 80 control ⁇ a tran ⁇ mit antenna 82 to tran ⁇ mit a suitable response signal R when the incoming code matche ⁇ the ⁇ tored code.
  • the tag additionally comprises a light emitting diode 84 connected to the output of the logic circuitry 80 via a resistor 86.
  • the purpose of this light emitting diode is to provide a visual indication at each tag.
  • the light emitting diode 84 can be activated from the domain controller by including an appropriate message in the signal T transmitted from the domain controller.
  • the light emitting diode will light up when the valid time for that tag has expired, thereby indicating to a supervisor that that per ⁇ on should be removed from the monitored area.
  • the tag monitoring system described herein has applications in many different area ⁇ where it i ⁇ required to monitor the locations of persons within a site or building, e.g. workers in hazardous environments, babies in hospitals, security and acces ⁇ control systems.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

On décrit un système de contrôle d'étiquettes ainsi qu'une étiquette utilisée dans celui-ci. Grâce à ce système, on peut détecter l'endroit où se trouvent les détenteurs d'étiquette, et ce à l'intérieur de différentes zones d'un bâtiment ou d'un autre lieu. On peut effectuer cette détection en utilisant une pluralité d'ensembles de balises, chaque ensemble délimitant une région à l'intérieur d'un volume contrôlé. Ces ensembles de balises peuvent être choisis de manière séquentielle afin d'interroger sélectivement la région qu'ils contrôlent, d'identifier de manière unique toute étiquette se trouvant dans cette région, et de mettre à jour, en conséquence, les données de localisation déterminant l'endroit où se trouvent les détenteurs d'étiquette.
PCT/GB1996/001516 1995-06-21 1996-06-21 Etiquette et systeme de controle d'etiquettes Ceased WO1997001154A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9512562.1 1995-06-21
GBGB9512563.9A GB9512563D0 (en) 1995-06-21 1995-06-21 Tag monitoring system
GB9512563.9 1995-06-21
GBGB9512562.1A GB9512562D0 (en) 1995-06-21 1995-06-21 A tag

Publications (1)

Publication Number Publication Date
WO1997001154A1 true WO1997001154A1 (fr) 1997-01-09

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Application Number Title Priority Date Filing Date
PCT/GB1996/001516 Ceased WO1997001154A1 (fr) 1995-06-21 1996-06-21 Etiquette et systeme de controle d'etiquettes

Country Status (1)

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WO (1) WO1997001154A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812908A1 (de) * 1998-03-18 1999-09-23 Bb Data Inf & Komm Syst Gmbh Inventarisierungssystem mit einer Datenverarbeitung- oder Kommunikationsanlage
DE19812883A1 (de) * 1998-03-17 1999-10-14 Axel Bartsch Verfahren und Vorrichtung zum Auffinden von mit Transpondern versehenen Objekten mittels elektronischer Einrichtungen
WO1999064887A1 (fr) * 1998-06-11 1999-12-16 At & T Laboratories Cambridge Limited Systeme de localisation
GB2341046A (en) * 1998-07-28 2000-03-01 Identec Ltd Transponder identification system
FR2786875A1 (fr) * 1998-12-07 2000-06-09 Alain Vaucelle Installation de recherche et de localisation de personnes dans une enceinte delimitee
DE10227581A1 (de) * 2002-06-20 2004-01-08 Esg Elektroniksystem- Und Logistik-Gmbh Vorrichtung zum Auffinden von Objekten
US7113095B2 (en) 2000-05-22 2006-09-26 Avery Dennison Corp. Trackable files and systems for using the same
DE102006034857A1 (de) * 2006-07-25 2008-01-31 Endress + Hauser Process Solutions Ag Verfahren und Vorrichtung zur Lokalisierung von Personen in automatisierungstechnischen Anlagen
DE202008005467U1 (de) * 2008-04-18 2009-08-27 Rittal Gmbh & Co. Kg Positionsüberwachungseinrichtung für Personen
EP2126794A4 (fr) * 2007-01-24 2010-08-11 Univ Hong Kong Polytechnic Appareil et procédé d'identification de déplacement et d'emplacement d'objet à l'aide d'un dispositif rfid
CN103177272A (zh) * 2011-12-23 2013-06-26 广州安的电子科技有限公司 一种rfid三维通道门
US9691239B2 (en) 2013-12-30 2017-06-27 Timmy Lee Fugate Electronic system for locating remote objects

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812883A1 (de) * 1998-03-17 1999-10-14 Axel Bartsch Verfahren und Vorrichtung zum Auffinden von mit Transpondern versehenen Objekten mittels elektronischer Einrichtungen
DE19812908A1 (de) * 1998-03-18 1999-09-23 Bb Data Inf & Komm Syst Gmbh Inventarisierungssystem mit einer Datenverarbeitung- oder Kommunikationsanlage
US6718278B1 (en) 1998-06-11 2004-04-06 At&T Laboratories Cambridge Limited Location system
WO1999064887A1 (fr) * 1998-06-11 1999-12-16 At & T Laboratories Cambridge Limited Systeme de localisation
GB2354323A (en) * 1998-06-11 2001-03-21 At & T Lab Cambridge Ltd Location system
GB2354323B (en) * 1998-06-11 2002-10-16 At & T Lab Cambridge Ltd Location system
GB2341046A (en) * 1998-07-28 2000-03-01 Identec Ltd Transponder identification system
FR2786875A1 (fr) * 1998-12-07 2000-06-09 Alain Vaucelle Installation de recherche et de localisation de personnes dans une enceinte delimitee
US7113095B2 (en) 2000-05-22 2006-09-26 Avery Dennison Corp. Trackable files and systems for using the same
DE10227581A1 (de) * 2002-06-20 2004-01-08 Esg Elektroniksystem- Und Logistik-Gmbh Vorrichtung zum Auffinden von Objekten
DE102006034857A1 (de) * 2006-07-25 2008-01-31 Endress + Hauser Process Solutions Ag Verfahren und Vorrichtung zur Lokalisierung von Personen in automatisierungstechnischen Anlagen
EP2126794A4 (fr) * 2007-01-24 2010-08-11 Univ Hong Kong Polytechnic Appareil et procédé d'identification de déplacement et d'emplacement d'objet à l'aide d'un dispositif rfid
DE202008005467U1 (de) * 2008-04-18 2009-08-27 Rittal Gmbh & Co. Kg Positionsüberwachungseinrichtung für Personen
US8618931B2 (en) 2008-04-18 2013-12-31 Rittal Gmbh & Co. Kg Position-monitoring device for persons in a tunnel system
CN103177272A (zh) * 2011-12-23 2013-06-26 广州安的电子科技有限公司 一种rfid三维通道门
US9691239B2 (en) 2013-12-30 2017-06-27 Timmy Lee Fugate Electronic system for locating remote objects
US10347096B2 (en) 2013-12-30 2019-07-09 Timmy Lee Fugate Electronic beacon

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