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GB1218622A - Object identification system - Google Patents

Object identification system

Info

Publication number
GB1218622A
GB1218622A GB06078/68A GB1607868A GB1218622A GB 1218622 A GB1218622 A GB 1218622A GB 06078/68 A GB06078/68 A GB 06078/68A GB 1607868 A GB1607868 A GB 1607868A GB 1218622 A GB1218622 A GB 1218622A
Authority
GB
United Kingdom
Prior art keywords
transmitter
signal
supplied
oscillator
period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB06078/68A
Inventor
Burnette Paul Chausse
Ronald Eric Gareis
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB1218622A publication Critical patent/GB1218622A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
    • B61L25/02—Indicating or recording positions or identities of vehicles or trains
    • B61L25/04—Indicating or recording train identities
    • 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
    • G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
    • G01S13/751—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal
    • G01S13/753—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal using frequency selective elements, e.g. resonator

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

1,218,622. Track apparatus. GENERAL ELECTRIC CO. 3 April, 1968 [5 May, 1967], No. 16078/68. Heading B7N. [Also in Division H4] An object identification system comprises a transmitter, Fig. 1., including an oscillator 19 providing a signal which is swept from 480 kc./s. to 450 kc./s. and is applied to a device 21 containing four piezo-electric elements resonant at 450 kc./s., 460 kc./s., 470 kc./s. and 480 kc./s., respectively. The output of the oscillator 19 also is supplied direct to the transmitter 23 and transmitted via a coil 29 to a transponder 10 carried by the object to be identified. As shown, the transponder includes two piezoelectric elements 15, 17 so that it has a low impedance at the two corresponding frequencies, e.g. 480 kc./s. and 460 kc./s., which are retransmitted as an identification number in binary form, the resulting oscillations having a slow decay rate. The four frequencies from device 21 are applied to a sequencing circuit 25 which controls a switch 36 to turn on the transmitter for a period of 500 microseconds at the start of each of the four frequencies and at the end of each period to switch off the transmitter and turn on the receiver 27 for a period of 150 microseconds. The output of receiver 27 is supplied via amplifier 31 to a discriminator 32 which also receives a sweep signal from oscillator 17 differing by 15 kc./s. from the sweep signal supplied to the transmitter. The resulting 15 kc./s. difference frequency is supplied to a digital detector 33 and logic circuit 34, Figs. 2 and 3 (not shown), which (a) provide a digital signal which switches on and off at the frequency of the input providing the input frequency is in the correct tolerance range and (b) provide an output only if the input signal is a true A.C. signal, thus eliminating noise signals. The signals passed by the logic circuit 34 are stored temporarily at 35 and read out either when the received signals cease for more than one sweep, or after a predetermined number of sweeps.
GB06078/68A 1967-05-05 1968-04-03 Object identification system Expired GB1218622A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US641411A US3363247A (en) 1967-05-05 1967-05-05 Identification system

Publications (1)

Publication Number Publication Date
GB1218622A true GB1218622A (en) 1971-01-06

Family

ID=24572259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB06078/68A Expired GB1218622A (en) 1967-05-05 1968-04-03 Object identification system

Country Status (5)

Country Link
US (1) US3363247A (en)
DE (1) DE1774169A1 (en)
FR (1) FR1561785A (en)
GB (1) GB1218622A (en)
SE (1) SE346090B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164185A (en) * 1984-08-28 1986-03-12 Electromatic Inductive loop detector

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624631A (en) * 1970-04-27 1971-11-30 Sanders Associates Inc Pilferage control system
JPS53120295A (en) * 1977-03-30 1978-10-20 Toshiba Corp Subject discrimination device
JPS56119868A (en) * 1980-02-27 1981-09-19 Toshiba Corp Object discriminator
US4642613A (en) * 1984-03-16 1987-02-10 Knogo Corporation Electronic theft detection apparatus with responder elements on protected articles
SE8404876L (en) * 1984-09-28 1986-05-21 Bengt Larsson IDENTIFICATION SYSTEM
FR2597635B1 (en) * 1986-04-16 1991-03-29 Livratel Sa METHOD FOR REMOTELY IDENTIFYING ISOLATED OR BULK OBJECTS WITH A CODED LABEL, LABEL AND INSTALLATION FOR IMPLEMENTING SAME
NL9100110A (en) * 1991-01-23 1992-08-17 Texas Instruments Holland INTERESTING STATION FOR IDENTIFICATION PURPOSES WITH SEPARATE TRANSMITTER AND RECEIVER ANTENNAS.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169242A (en) * 1963-03-19 1965-02-09 Gen Electric Identification interrogating system
US3209350A (en) * 1963-10-04 1965-09-28 Gen Electric Identification interrogation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164185A (en) * 1984-08-28 1986-03-12 Electromatic Inductive loop detector

Also Published As

Publication number Publication date
SE346090B (en) 1972-06-26
FR1561785A (en) 1969-03-28
DE1774169A1 (en) 1971-12-16
US3363247A (en) 1968-01-09

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