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GB1481494A - Train position indicator - Google Patents

Train position indicator

Info

Publication number
GB1481494A
GB1481494A GB1431975A GB1431975A GB1481494A GB 1481494 A GB1481494 A GB 1481494A GB 1431975 A GB1431975 A GB 1431975A GB 1431975 A GB1431975 A GB 1431975A GB 1481494 A GB1481494 A GB 1481494A
Authority
GB
United Kingdom
Prior art keywords
transponder
radar
antenna
train
track
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
GB1431975A
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 GB1431975A priority Critical patent/GB1481494A/en
Priority to DE19762611868 priority patent/DE2611868A1/en
Priority to IT2199576A priority patent/IT1059598B/en
Priority to CA249,775A priority patent/CA1089059A/en
Priority to ES446769A priority patent/ES446769A1/en
Priority to CH434676A priority patent/CH598985A5/xx
Publication of GB1481494A publication Critical patent/GB1481494A/en
Expired 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
    • 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
    • B61L25/026—Relative localisation, e.g. using odometer

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

1481494 Track apparatus STANDARD TELEPHONES & CABLES Ltd 8 April 1975 14319/75 Heading B7N [Also in Division H4] In the train position indicating system in which low power radar is used to interrogate simple transponders moving relative to the radar as described in Specification 1,479,616 inductive coupling means is provided between the radar and each transponder so that each transducer is enabled to provide a response only when the radar is close enough thereto to trigger inductively the transponder. As described, the radar device 1 mounted on a train includes an inductive coupling loop 12 located adjacent antenna 11, and driven by a 100 kHz signal from oscillator 13. The track mounted transponder 2 comprises an inductive track loop 22 adjacent its antenna 21. Mutual coupling between loops occurs only when train antenna 11 is substantially above antenna 21 so that spurious responses from nearby transponders are avoided. Track loop 22 is coupled to RC tuned rectifying network 23, 24, 25 which provides a D.C. output signal when mutual coupling between loops 12 and 22 occurs. Transponder 20 input comprises a switching means (not shown), e.g. a F.E.T., which is responsive to the D.C. signal 26, the presence of which enables the transponder. The presence of inductive coupling and therefore of a transponder can be detected in oscillator 13 on the train and may be used to trigger an alarm on lack of detection of the associated response signal received by radar 10 from the same transponder.
GB1431975A 1975-04-08 1975-04-08 Train position indicator Expired GB1481494A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB1431975A GB1481494A (en) 1975-04-08 1975-04-08 Train position indicator
DE19762611868 DE2611868A1 (en) 1975-04-08 1976-03-20 DEVICE FOR TRAIN POSITION INDICATION
IT2199576A IT1059598B (en) 1975-04-08 1976-04-07 SYSTEM FOR INDICATING THE POSITIONS OF A TRAIN
CA249,775A CA1089059A (en) 1975-04-08 1976-04-07 Train position indicator
ES446769A ES446769A1 (en) 1975-04-08 1976-04-07 Train position indicator
CH434676A CH598985A5 (en) 1975-04-08 1976-04-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1431975A GB1481494A (en) 1975-04-08 1975-04-08 Train position indicator

Publications (1)

Publication Number Publication Date
GB1481494A true GB1481494A (en) 1977-07-27

Family

ID=10039058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1431975A Expired GB1481494A (en) 1975-04-08 1975-04-08 Train position indicator

Country Status (6)

Country Link
CA (1) CA1089059A (en)
CH (1) CH598985A5 (en)
DE (1) DE2611868A1 (en)
ES (1) ES446769A1 (en)
GB (1) GB1481494A (en)
IT (1) IT1059598B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH660710A5 (en) * 1982-10-26 1987-06-15 Jd Technologie Ag DEVICE FOR CONTROL AND SIGNAL TRANSMISSION IN CONVEYORS.
US5129605A (en) * 1990-09-17 1992-07-14 Rockwell International Corporation Rail vehicle positioning system

Also Published As

Publication number Publication date
CA1089059A (en) 1980-11-04
DE2611868A1 (en) 1976-10-21
IT1059598B (en) 1982-06-21
ES446769A1 (en) 1977-10-01
CH598985A5 (en) 1978-05-12

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee