FR2260115A1 - Radio identification system for railway traffic - has interrogator reacting with passive responder containing several codes - Google Patents

Radio identification system for railway traffic - has interrogator reacting with passive responder containing several codes

Info

Publication number
FR2260115A1
FR2260115A1 FR7403432A FR7403432A FR2260115A1 FR 2260115 A1 FR2260115 A1 FR 2260115A1 FR 7403432 A FR7403432 A FR 7403432A FR 7403432 A FR7403432 A FR 7403432A FR 2260115 A1 FR2260115 A1 FR 2260115A1
Authority
FR
France
Prior art keywords
interrogator
signal
passive
reacting
identification system
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
FR7403432A
Other languages
French (fr)
Other versions
FR2260115B1 (en
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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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 Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Priority to FR7403432A priority Critical patent/FR2260115A1/en
Publication of FR2260115A1 publication Critical patent/FR2260115A1/en
Application granted granted Critical
Publication of FR2260115B1 publication Critical patent/FR2260115B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G01S13/758—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 a signal generator powered by the interrogation signal

Landscapes

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

Abstract

An interrogator sends a signal to a passive responder which retransmits a coded signal to the interrogator receiver. Several coded signals can be activated in the responder. An interrogator (4) comprises a transmission generator (5) which is connected to an antenna (4) through a ferrite circulator (6). The transmitted signal is received by the antenna (8) connected to one of a number of passive responders (2) in an interrogation zone (3). The received signal is modulated (4) by a variable reflectively element (9) which is controlled (10) by a delay circuit (15) from the output of the passive converter (14). The signal (11) from the responder is received by the interrogator and demodulated (12) for an operational circuit (13) containing a filter tuned to the modulating frequency.
FR7403432A 1974-02-01 1974-02-01 Radio identification system for railway traffic - has interrogator reacting with passive responder containing several codes Granted FR2260115A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7403432A FR2260115A1 (en) 1974-02-01 1974-02-01 Radio identification system for railway traffic - has interrogator reacting with passive responder containing several codes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7403432A FR2260115A1 (en) 1974-02-01 1974-02-01 Radio identification system for railway traffic - has interrogator reacting with passive responder containing several codes

Publications (2)

Publication Number Publication Date
FR2260115A1 true FR2260115A1 (en) 1975-08-29
FR2260115B1 FR2260115B1 (en) 1978-03-17

Family

ID=9134365

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7403432A Granted FR2260115A1 (en) 1974-02-01 1974-02-01 Radio identification system for railway traffic - has interrogator reacting with passive responder containing several codes

Country Status (1)

Country Link
FR (1) FR2260115A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647930A (en) * 1983-10-11 1987-03-03 Lmt Radio Professionnelle Passive radar responder
FR2593761A1 (en) * 1986-01-24 1987-08-07 Sfim Railway signalling system for recognising a predetermined vehicle when it passes a given point
US4694297A (en) * 1984-02-27 1987-09-15 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence Remote identification device
US4912471A (en) * 1983-11-03 1990-03-27 Mitron Systems Corporation Interrogator-responder communication system
EP0480413A3 (en) * 1990-10-10 1992-08-12 Nippondenso Co., Ltd. Responder in movable-object identification system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647930A (en) * 1983-10-11 1987-03-03 Lmt Radio Professionnelle Passive radar responder
US4912471A (en) * 1983-11-03 1990-03-27 Mitron Systems Corporation Interrogator-responder communication system
US4694297A (en) * 1984-02-27 1987-09-15 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence Remote identification device
FR2593761A1 (en) * 1986-01-24 1987-08-07 Sfim Railway signalling system for recognising a predetermined vehicle when it passes a given point
EP0480413A3 (en) * 1990-10-10 1992-08-12 Nippondenso Co., Ltd. Responder in movable-object identification system

Also Published As

Publication number Publication date
FR2260115B1 (en) 1978-03-17

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Legal Events

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ST Notification of lapse