JPS5497471A - Ultrasonic type vehicle speed measuring apparatus - Google Patents

Ultrasonic type vehicle speed measuring apparatus

Info

Publication number
JPS5497471A
JPS5497471A JP463078A JP463078A JPS5497471A JP S5497471 A JPS5497471 A JP S5497471A JP 463078 A JP463078 A JP 463078A JP 463078 A JP463078 A JP 463078A JP S5497471 A JPS5497471 A JP S5497471A
Authority
JP
Japan
Prior art keywords
circuit
waves
speed
vehicle speed
frequency
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
JP463078A
Other languages
Japanese (ja)
Other versions
JPS6213632B2 (en
Inventor
Ko Honma
Kazuhiro Morizaki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP463078A priority Critical patent/JPS5497471A/en
Publication of JPS5497471A publication Critical patent/JPS5497471A/en
Publication of JPS6213632B2 publication Critical patent/JPS6213632B2/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

Abstract

PURPOSE:To measure the vehicle speed at high precision, by changing over the gate periods corresponding to the specified number of Doppler waves and specified number of continuously emitted ultrasonic waves to count with a counter, and processing the count in a dividing circuit to which is applied a specific coefficient. CONSTITUTION:Continuous ultrasonic waves emitted at an emission angle of theta and frequency of fo are reflected by a vehicle running at speed V, and ultrasonic waves at Doppler frequency fd are detected. The n-waves of these Doppler waves are detected in an n-wave continuous detection circuit 12, and pulses of n/fd width are applied to a gate time changing circuit 14 to which are applied also pulses of n/2fo width from a timer 13. Taking n/fd+n/2fo through this circuit 14 as the gate period, a counter 16 counts the number of clocks at frequency fc sent from a clock generating circuit 15, and the count value is processed in a dividing circuit 17 to which is applied a coefficient (nfc/2fo)XC/costheta outputted from a constant generating circuit 18. Then, according to formula I, the speed may be calculated without abbreviation. Therefore, the vehicle speed may be measured at high precision. Meanwhile, c refers to the propagation speed of ultrasonic wave in the air.
JP463078A 1978-01-18 1978-01-18 Ultrasonic type vehicle speed measuring apparatus Granted JPS5497471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP463078A JPS5497471A (en) 1978-01-18 1978-01-18 Ultrasonic type vehicle speed measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP463078A JPS5497471A (en) 1978-01-18 1978-01-18 Ultrasonic type vehicle speed measuring apparatus

Publications (2)

Publication Number Publication Date
JPS5497471A true JPS5497471A (en) 1979-08-01
JPS6213632B2 JPS6213632B2 (en) 1987-03-27

Family

ID=11589332

Family Applications (1)

Application Number Title Priority Date Filing Date
JP463078A Granted JPS5497471A (en) 1978-01-18 1978-01-18 Ultrasonic type vehicle speed measuring apparatus

Country Status (1)

Country Link
JP (1) JPS5497471A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5951374A (en) * 1982-09-17 1984-03-24 Furuno Electric Co Ltd Direct reading counter for doppler speed information
US4942558A (en) * 1988-03-31 1990-07-17 Micro-Trak Systems, Inc. Ultrasonic velocity sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5951374A (en) * 1982-09-17 1984-03-24 Furuno Electric Co Ltd Direct reading counter for doppler speed information
JPH0148518B2 (en) * 1982-09-17 1989-10-19 Furuno Electric Co
US4942558A (en) * 1988-03-31 1990-07-17 Micro-Trak Systems, Inc. Ultrasonic velocity sensor

Also Published As

Publication number Publication date
JPS6213632B2 (en) 1987-03-27

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