CA2104829A1 - Synchronised electronic identification system - Google Patents

Synchronised electronic identification system

Info

Publication number
CA2104829A1
CA2104829A1 CA002104829A CA2104829A CA2104829A1 CA 2104829 A1 CA2104829 A1 CA 2104829A1 CA 002104829 A CA002104829 A CA 002104829A CA 2104829 A CA2104829 A CA 2104829A CA 2104829 A1 CA2104829 A1 CA 2104829A1
Authority
CA
Canada
Prior art keywords
transponder
signal
response signal
interrogation
interrogator
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.)
Granted
Application number
CA002104829A
Other languages
French (fr)
Other versions
CA2104829C (en
Inventor
Michael John Camille Marsh
Clinton Aiden Van Zyl
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.)
BTG International Ltd
Original Assignee
British Technology Group Ltd.
Michael John Camille Marsh
Clinton Aiden Van Zyl
Csir
Btg International Limited
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 British Technology Group Ltd., Michael John Camille Marsh, Clinton Aiden Van Zyl, Csir, Btg International Limited filed Critical British Technology Group Ltd.
Publication of CA2104829A1 publication Critical patent/CA2104829A1/en
Application granted granted Critical
Publication of CA2104829C publication Critical patent/CA2104829C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • G06K7/10019—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
    • G06K7/10059—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 transponder driven
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/78—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe
    • 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

Abstract

The invention relates to an identification system comprising an interrogator and a plurality of transponders. The interrogator includes transmitter means for transmitting an interrogation signal to the transponder, receiver means for receiving a response signal from the transponder, and processor means for identifying the transponder from data in the response signal. Clock extraction means are further provided for extracting a transponder clock signal from the response signal which is used to synchronise the modification of the interrogation signal with the response signal from the transponder. Each transponder comprises receiver means for receiving the interrogation signal, a transponder clock generator, a code generator, transmitter means, and a modulator connected to the node generator, so that on receipt of the interrogation signal the transponder transmits a response signal containing data which identifies the transponder. The interrogator is adapted to detect successful reception of a response signal from any transponder, to derive a synchronisation signal from the response signal of that transponder, and to modify the interrogation signal synchronously with the response signal to indicate successful reception of the response signal. Each transponder further includes means responsive to a respective modification of the interrogation signal to cease transmission of its response signal.
CA002104829A 1992-08-26 1993-08-25 Synchronised electronic identification system Expired - Fee Related CA2104829C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA92/6446 1992-08-26
ZA926446 1992-08-26

Publications (2)

Publication Number Publication Date
CA2104829A1 true CA2104829A1 (en) 1994-02-27
CA2104829C CA2104829C (en) 2004-11-23

Family

ID=25582026

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002104829A Expired - Fee Related CA2104829C (en) 1992-08-26 1993-08-25 Synchronised electronic identification system

Country Status (15)

Country Link
US (2) US5557280A (en)
EP (1) EP0585132B1 (en)
JP (1) JP3290003B2 (en)
CN (1) CN1047667C (en)
AT (1) ATE171547T1 (en)
AU (2) AU656088B2 (en)
CA (1) CA2104829C (en)
DE (1) DE69321179T2 (en)
DK (1) DK0585132T3 (en)
ES (1) ES2121954T3 (en)
RU (1) RU2156540C2 (en)
SG (1) SG48262A1 (en)
TW (1) TW297192B (en)
UA (1) UA37182C2 (en)
ZA (1) ZA936267B (en)

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CA2104829C (en) 2004-11-23
EP0585132A1 (en) 1994-03-02
US5557280A (en) 1996-09-17
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CN1088371A (en) 1994-06-22
ATE171547T1 (en) 1998-10-15
ES2121954T3 (en) 1998-12-16
DE69321179T2 (en) 1999-05-06
UA37182C2 (en) 2001-05-15
AU656088B2 (en) 1995-01-19
TW297192B (en) 1997-02-01
AU4494093A (en) 1994-03-03
JPH07311263A (en) 1995-11-28
JP3290003B2 (en) 2002-06-10
SG48262A1 (en) 1998-04-17
ZA936267B (en) 1994-04-14
AU1653095A (en) 1995-06-29
DE69321179D1 (en) 1998-10-29
AU670402B2 (en) 1996-07-11
DK0585132T3 (en) 1999-06-14
CN1047667C (en) 1999-12-22
US5699066A (en) 1997-12-16

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