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JPS5686373A - Detection device of car speed - Google Patents

Detection device of car speed

Info

Publication number
JPS5686373A
JPS5686373A JP16387879A JP16387879A JPS5686373A JP S5686373 A JPS5686373 A JP S5686373A JP 16387879 A JP16387879 A JP 16387879A JP 16387879 A JP16387879 A JP 16387879A JP S5686373 A JPS5686373 A JP S5686373A
Authority
JP
Japan
Prior art keywords
car
frequency
double side
running
waveform
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
JP16387879A
Other languages
Japanese (ja)
Other versions
JPS5952993B2 (en
Inventor
Masashi Okuyama
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.)
Nippon Signal Co Ltd
Original Assignee
Nippon Signal Co Ltd
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 Nippon Signal Co Ltd filed Critical Nippon Signal Co Ltd
Priority to JP16387879A priority Critical patent/JPS5952993B2/en
Publication of JPS5686373A publication Critical patent/JPS5686373A/en
Publication of JPS5952993B2 publication Critical patent/JPS5952993B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
    • G01P3/52—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring amplitude of generated current or voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

PURPOSE:To detect low speed of a car, by utilizing the fact that the waveform of a reception signal turns to the double side-band modulated wave being in the suppressed transmission mode of the frequency components while a car is running. CONSTITUTION:An AC signal of the fixed frequency is transmitted and received between an antenna CA provided on the car CT and a ground loop antennas LA which are provided equidistantly along the running path of the car CT. Utilizing the fact that the waveform of reception signal turns to the double side-band modulated wave being in the suppressed transmission mode of the frequency component while a car is running, a bandpass filter is provided which passes a double side-band frequency corresponding to a transmission frequency and a detected speed of the car. Then the signal level is detected passing through the filter to detect the low speed of the car CT.
JP16387879A 1979-12-17 1979-12-17 Vehicle speed detection device Expired JPS5952993B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16387879A JPS5952993B2 (en) 1979-12-17 1979-12-17 Vehicle speed detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16387879A JPS5952993B2 (en) 1979-12-17 1979-12-17 Vehicle speed detection device

Publications (2)

Publication Number Publication Date
JPS5686373A true JPS5686373A (en) 1981-07-14
JPS5952993B2 JPS5952993B2 (en) 1984-12-22

Family

ID=15782496

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16387879A Expired JPS5952993B2 (en) 1979-12-17 1979-12-17 Vehicle speed detection device

Country Status (1)

Country Link
JP (1) JPS5952993B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675863A (en) 1985-03-20 1987-06-23 International Mobile Machines Corp. Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
JPS6359514U (en) * 1986-10-06 1988-04-20

Also Published As

Publication number Publication date
JPS5952993B2 (en) 1984-12-22

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