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
• • 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
  • B61L25/045—Indicating or recording train identities using reradiating tags

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)
• Control Of Motors That Do Not Use Commutators (AREA)
• Waveguide Aerials (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=5783335

Family Applications (1)

Country Status (8)

• 1970
  • 1970-09-24 DE DE19702047153 patent/DE2047153C3/de not_active Expired
• 1971
  • 1971-09-15 BE BE772633A patent/BE772633A/xx unknown
  • 1971-09-22 IT IT2891071A patent/IT938792B/it active
  • 1971-09-22 NL NL7113031A patent/NL7113031A/xx not_active Application Discontinuation
  • 1971-09-22 LU LU63941D patent/LU63941A1/xx unknown
  • 1971-09-23 SE SE1204671A patent/SE362839B/xx unknown
  • 1971-09-23 FR FR7134197A patent/FR2107931B1/fr not_active Expired
  • 1971-09-24 GB GB4474771A patent/GB1332574A/en not_active Expired

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