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JPS55114974A - Information transmission unit - Google Patents

Information transmission unit

Info

Publication number
JPS55114974A
JPS55114974A JP2232179A JP2232179A JPS55114974A JP S55114974 A JPS55114974 A JP S55114974A JP 2232179 A JP2232179 A JP 2232179A JP 2232179 A JP2232179 A JP 2232179A JP S55114974 A JPS55114974 A JP S55114974A
Authority
JP
Japan
Prior art keywords
responser
wave
transmission
code string
modulation
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.)
Pending
Application number
JP2232179A
Other languages
Japanese (ja)
Inventor
Shinichi Inada
Shoji Mutsushima
Taiichi Katayama
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.)
JAPANESE NATIONAL RAILWAYS<JNR>
Japan National Railways
Mitsubishi Electric Corp
Original Assignee
JAPANESE NATIONAL RAILWAYS<JNR>
Japan National Railways
Mitsubishi Electric Corp
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 JAPANESE NATIONAL RAILWAYS<JNR>, Japan National Railways, Mitsubishi Electric Corp filed Critical JAPANESE NATIONAL RAILWAYS<JNR>
Priority to JP2232179A priority Critical patent/JPS55114974A/en
Publication of JPS55114974A publication Critical patent/JPS55114974A/en
Pending 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

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)
  • Traffic Control Systems (AREA)

Abstract

PURPOSE:To improve power use efficiency and frequency stability by modulating radio waves with a fixed frequency and by detecting them intermittently according to the code by a responser. CONSTITUTION:The micro wave output of transmission part 1 of interrogator 101 is continuously radiated toward responser 102 through transmission antenna 2. Receiving antenna 11 of responser 102 receives it and converts it to a DC by rectifier circuit 12 to supply power to respective parts of the responser. Sequence unit 13 reads out binary memory contents including synchronizing signals from memory unit 14 and makes them into a code string and controls turning-on and off of modulation wave oscillator 18 with a unit time width. The radio wave for response is radiated from transmission antenna 17 by repeating the receiving input with no power source as it is, however, it is modulated by the output of oscillator 18 in modulator circuit 15. Thus, the radio wave for response inputted to receiving detection part 4 by receiving antenna 3 with the same frequency as the transmission wave has the modulation part and non-modulation part connected according to the binary code string, and only the modulation part is detected by 4, and the binary code string is read by decoding 5.
JP2232179A 1979-02-27 1979-02-27 Information transmission unit Pending JPS55114974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2232179A JPS55114974A (en) 1979-02-27 1979-02-27 Information transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2232179A JPS55114974A (en) 1979-02-27 1979-02-27 Information transmission unit

Publications (1)

Publication Number Publication Date
JPS55114974A true JPS55114974A (en) 1980-09-04

Family

ID=12079452

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2232179A Pending JPS55114974A (en) 1979-02-27 1979-02-27 Information transmission unit

Country Status (1)

Country Link
JP (1) JPS55114974A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451958A (en) * 1993-05-21 1995-09-19 Texas Instruments Deutschland Gmbh Dual standard RF-ID system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451958A (en) * 1993-05-21 1995-09-19 Texas Instruments Deutschland Gmbh Dual standard RF-ID system
EP0693695A1 (en) * 1993-05-21 1996-01-24 Texas Instruments Deutschland Gmbh Dual standard radio frequency identification system

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