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JPS54139772A - Speedometer - Google Patents

Speedometer

Info

Publication number
JPS54139772A
JPS54139772A JP4899478A JP4899478A JPS54139772A JP S54139772 A JPS54139772 A JP S54139772A JP 4899478 A JP4899478 A JP 4899478A JP 4899478 A JP4899478 A JP 4899478A JP S54139772 A JPS54139772 A JP S54139772A
Authority
JP
Japan
Prior art keywords
thru
speed
receiving
signal
ground
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
JP4899478A
Other languages
Japanese (ja)
Other versions
JPS6219710B2 (en
Inventor
Yoshio Kurita
Noritake Shibata
Takaharu Matsumoto
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Hokushin Electric Corp
Priority to JP4899478A priority Critical patent/JPS54139772A/en
Publication of JPS54139772A publication Critical patent/JPS54139772A/en
Publication of JPS6219710B2 publication Critical patent/JPS6219710B2/ja
Granted 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To provide a robust and highly accurate speedometer which does not have any moving parts by providing ultrasonic transmitting-receiving parts at an equal spacing in the moving direction integrally with a moving object and receiving the random noise included in the reflected waves from the ground during running. CONSTITUTION:The receiving signals having been transmitted and received by ultrasonic transmitters-receivers 31 thru 38, 31' thru 38' as a moving object 1 moves in the arrow direction have been modulated by the random noise owing to the undulations of the ground 2. The receiving signals from the receivers 31' thru 38' are applied to modulators 41 thru 48 to become modulated signals which are then sent out to an adder-subtractor 50, by which the output signal f0' is obtained and this becomes the signal wherein the specific frequency component (N+1/2)v/d has been intensified. Here, v denotes the speed of the moving object and N the receiving part serial numbers and if their spacing d is suitably selected, the signal f00=v/2d of N=0 may be intensified, thus the speed v may be known by measuring the frequency f00. The object 1 is installed to the body of an automobile and its speed may be known from the signal f0, thus the speed to the ground may be obtained at high accuracy and the robust speedometer obtained.
JP4899478A 1978-04-21 1978-04-21 Speedometer Granted JPS54139772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4899478A JPS54139772A (en) 1978-04-21 1978-04-21 Speedometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4899478A JPS54139772A (en) 1978-04-21 1978-04-21 Speedometer

Publications (2)

Publication Number Publication Date
JPS54139772A true JPS54139772A (en) 1979-10-30
JPS6219710B2 JPS6219710B2 (en) 1987-04-30

Family

ID=12818757

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4899478A Granted JPS54139772A (en) 1978-04-21 1978-04-21 Speedometer

Country Status (1)

Country Link
JP (1) JPS54139772A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506353A (en) * 1981-06-10 1985-03-19 Krone Gmbh Measuring apparatus for the automatic measurement of speed, travelled distance and directional changes of a movable body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506353A (en) * 1981-06-10 1985-03-19 Krone Gmbh Measuring apparatus for the automatic measurement of speed, travelled distance and directional changes of a movable body

Also Published As

Publication number Publication date
JPS6219710B2 (en) 1987-04-30

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