GB1296410A - - Google Patents

Info

Publication number
GB1296410A
GB1296410A GB1296410DA GB1296410A GB 1296410 A GB1296410 A GB 1296410A GB 1296410D A GB1296410D A GB 1296410DA GB 1296410 A GB1296410 A GB 1296410A
Authority
GB
United Kingdom
Prior art keywords
responders
vehicle
radio
frequency
responder
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
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 filed Critical
Publication of GB1296410A publication Critical patent/GB1296410A/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
    • G01S13/753—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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams

Landscapes

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

Abstract

1296410 Radio signalling; transponders MARCONI CO Ltd 2 July 1971 [4 Sept 1970] 42374/70 Heading H4L In a system for locating vehicles in a given area a plurality of radio responders consisting of one or more cavity resonators directly connected to aerials are erected at predetermined positions in the area, the resonant frequencies or frequency radiated from each responder forming an identification signal peculiar to that transponder, and each vehicle has means for transmitting a radio-frequency signal which is swept over the full range of response frequencies available to all the responders and means responsive to the signals received from an adjacent responder in response to the interrogation signal from the vehicle to retransmit them to a base station on a carrier frequency which does not affect the responders. The carrier frequency or other means such as a distinctive modulation or time of transmission may be used to identify the vehicle.
GB1296410D 1970-09-04 1970-09-04 Expired GB1296410A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4237470 1970-09-04

Publications (1)

Publication Number Publication Date
GB1296410A true GB1296410A (en) 1972-11-15

Family

ID=10424145

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1296410D Expired GB1296410A (en) 1970-09-04 1970-09-04

Country Status (3)

Country Link
AU (1) AU3245271A (en)
CA (1) CA948730A (en)
GB (1) GB1296410A (en)

Also Published As

Publication number Publication date
CA948730A (en) 1974-06-04
AU3245271A (en) 1973-02-22

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee