GB1429289A - Identification system - Google Patents

Identification system

Info

Publication number
GB1429289A
GB1429289A GB4975367A GB4975367A GB1429289A GB 1429289 A GB1429289 A GB 1429289A GB 4975367 A GB4975367 A GB 4975367A GB 4975367 A GB4975367 A GB 4975367A GB 1429289 A GB1429289 A GB 1429289A
Authority
GB
United Kingdom
Prior art keywords
laser
optical
transponder
interrogating
focused
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
GB4975367A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4975367A priority Critical patent/GB1429289A/en
Publication of GB1429289A publication Critical patent/GB1429289A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/74—Systems using reradiation of electromagnetic waves other than radio waves, e.g. IFF, i.e. identification of friend or foe
    • 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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
    • G01S3/782—Systems for determining direction or deviation from predetermined direction

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

1429289 Optical transponder STANDARD TELEPHONES & CABLES Ltd 1 Nov 1967 49753/67 Heading G1A In an optical transponder the interrogating signals are focused on to a photo-detector 3 Fig. 1 and the laser 4 is modulated if the correct interrogating signals are recognized. The interrogating signals are focused by lenses 1, 2 and fully-silvered mirror 5 reflects the laser beam through lens 1 at a small angle to the optical axis of the detection arrangement. The laser and detector are mounted in the housing 23 Fig. 2, horizontally pivoted at bearings 24. The housing and bearings are both rotatable about a vertical axis by a motor 26. Elevational scanning is effected by a worm gear 36 through the cam 39 and follower 40. Cooling is effected by Peltier devices. Optical indication of interrogation is provided by a persistent phosphor display device calibrated in accordance with the axis of the vehicle carrying the transponder; the phosphors are subjected via a light fibre to a light pulse positioned in correspondence with the direction of the interrogating signal. The laser may be gallium arsenide.
GB4975367A 1967-11-01 1967-11-01 Identification system Expired GB1429289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4975367A GB1429289A (en) 1967-11-01 1967-11-01 Identification system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4975367A GB1429289A (en) 1967-11-01 1967-11-01 Identification system

Publications (1)

Publication Number Publication Date
GB1429289A true GB1429289A (en) 1976-03-24

Family

ID=10453425

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4975367A Expired GB1429289A (en) 1967-11-01 1967-11-01 Identification system

Country Status (1)

Country Link
GB (1) GB1429289A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230990A (en) * 1979-03-16 1980-10-28 Lert John G Jr Broadcast program identification method and system
US4249265A (en) * 1978-10-06 1981-02-03 Societe Anonyme De Telecommunications Device for receiving and transmitting coded light signals and IFF system incorporating this device
US4422181A (en) * 1980-08-26 1983-12-20 The United States Of America As Represented By The Secretary Of The Army Bi-directional fibre-optic coupler
EP0204436A1 (en) * 1985-05-24 1986-12-10 Wells-Gardner Electronics Corp. Light distribution and detection apparatus
GB2180424A (en) * 1985-09-10 1987-03-25 Shorrock Security Systems Ltd Non-contact identification system
US4980547A (en) * 1985-05-24 1990-12-25 Wells-Gardner Electronics Corp. Light distribution and detection apparatus
US5142288A (en) * 1987-12-11 1992-08-25 Cleveland William C Electro-optical IFF system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249265A (en) * 1978-10-06 1981-02-03 Societe Anonyme De Telecommunications Device for receiving and transmitting coded light signals and IFF system incorporating this device
US4230990A (en) * 1979-03-16 1980-10-28 Lert John G Jr Broadcast program identification method and system
US4422181A (en) * 1980-08-26 1983-12-20 The United States Of America As Represented By The Secretary Of The Army Bi-directional fibre-optic coupler
EP0204436A1 (en) * 1985-05-24 1986-12-10 Wells-Gardner Electronics Corp. Light distribution and detection apparatus
US4980547A (en) * 1985-05-24 1990-12-25 Wells-Gardner Electronics Corp. Light distribution and detection apparatus
GB2180424A (en) * 1985-09-10 1987-03-25 Shorrock Security Systems Ltd Non-contact identification system
US5142288A (en) * 1987-12-11 1992-08-25 Cleveland William C Electro-optical IFF system

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees