JPS5782783A - Relative speed detector - Google Patents

Relative speed detector

Info

Publication number
JPS5782783A
JPS5782783A JP55159971A JP15997180A JPS5782783A JP S5782783 A JPS5782783 A JP S5782783A JP 55159971 A JP55159971 A JP 55159971A JP 15997180 A JP15997180 A JP 15997180A JP S5782783 A JPS5782783 A JP S5782783A
Authority
JP
Japan
Prior art keywords
signal
station
difference
relative speed
detected
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
JP55159971A
Other languages
Japanese (ja)
Inventor
Tadashi Iwata
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.)
Mitsubishi Electric Corp
Original Assignee
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP55159971A priority Critical patent/JPS5782783A/en
Publication of JPS5782783A publication Critical patent/JPS5782783A/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
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S13/60—Velocity or trajectory determination systems; Sense-of-movement determination systems wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track

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)

Abstract

PURPOSE:To improve the precision of the detection of a relative speed by measuring a reference frequency difference between both stations by a train approach waring device, etc., and by processing the measurement result at the opposite station. CONSTITUTION:A signal of the reference frequency f1 of a station A is made into pulses through a switch 2, and they are sent from an antenna 3. At a station B, a difference between a signal of f1+DELTAf1 and a signal of the reference frequency f2 of the station B is detected 10 and held 11, by a Doppler shift, and the signal is sent to the station A through a modulator 12, a reference oscillator 9 for the f2, and a switch 8. At the station A, a difference between a signal f2+DELTAf2 having the Doppler shift and the signal f1 is detected 4, and the sum of this difference signal and a signal obtained by modulating the difference signal detected at the station B is calculated 5. Therefore, only a Doppler shift DELTAf1+DELTAf2 appears at an arithmetic output and from this value, the relative speed between the stations A and B is found.
JP55159971A 1980-11-12 1980-11-12 Relative speed detector Pending JPS5782783A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55159971A JPS5782783A (en) 1980-11-12 1980-11-12 Relative speed detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55159971A JPS5782783A (en) 1980-11-12 1980-11-12 Relative speed detector

Publications (1)

Publication Number Publication Date
JPS5782783A true JPS5782783A (en) 1982-05-24

Family

ID=15705165

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55159971A Pending JPS5782783A (en) 1980-11-12 1980-11-12 Relative speed detector

Country Status (1)

Country Link
JP (1) JPS5782783A (en)

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