JPS5550174A - Method of measuring distance - Google Patents

Method of measuring distance

Info

Publication number
JPS5550174A
JPS5550174A JP12271178A JP12271178A JPS5550174A JP S5550174 A JPS5550174 A JP S5550174A JP 12271178 A JP12271178 A JP 12271178A JP 12271178 A JP12271178 A JP 12271178A JP S5550174 A JPS5550174 A JP S5550174A
Authority
JP
Japan
Prior art keywords
frequency
waves
reflected
signals
waves reflected
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
JP12271178A
Other languages
Japanese (ja)
Inventor
Masakatsu Ogaki
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP12271178A priority Critical patent/JPS5550174A/en
Publication of JPS5550174A publication Critical patent/JPS5550174A/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
    • 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
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • G01S15/10—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G01S15/102—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves using transmission of pulses having some particular characteristics
    • G01S15/107—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves using transmission of pulses having some particular characteristics using frequency agility of carrier wave

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 measure the distance from an object while discriminating the distance from that from a halfway obstable, by using signals of different frequency, determining the ratio between the maximum values of received wave outputs and indicating the ratio. CONSTITUTION:A signal of such frequency that reflected waves from obstacles 41-4j are few and another signal of such frequency that the reflected waves from the obstacles are numerous are produced by oscillators 51, 52. The two signals are sequentially switched by a change-over unit 6 and then converted into modulated pulses by a pulse modulator 7. An ultrasonic wave transmitter receiver 2 is driven by the modulated pulses through a power amplifier 8 and a transmission/reception switch 9 to emit ultrasonic pulses to a region 3. The waves reflected on the obstacles 41-4j are received by the transmitter receiver 2, the output of which is passed through the switch 9 and then amplified by an amplifier 10. Only signals of presscribed frequencies are then picked out by a filter 11 and stored in a memory 12. The ratio between the maximum values of the received wave forms of the stored signals of frequencies f1, f2 is determined by a calculator 13 so that the frequency f2 is used as a reference. As a result, the form of waves reflected on each obstacle is indicated on a display unit 14 in a much smaller size than that of waves reflected on the object 1. If the other frequency f1 is used as a reference, the form of waves reflected on each obstacle is indicated on the display unit in a much larger size than that of waves reflected on the object.
JP12271178A 1978-10-06 1978-10-06 Method of measuring distance Pending JPS5550174A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12271178A JPS5550174A (en) 1978-10-06 1978-10-06 Method of measuring distance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12271178A JPS5550174A (en) 1978-10-06 1978-10-06 Method of measuring distance

Publications (1)

Publication Number Publication Date
JPS5550174A true JPS5550174A (en) 1980-04-11

Family

ID=14842705

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12271178A Pending JPS5550174A (en) 1978-10-06 1978-10-06 Method of measuring distance

Country Status (1)

Country Link
JP (1) JPS5550174A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154682A (en) * 1982-03-09 1983-09-14 Mitsubishi Electric Corp Detector of substance
JPS5945247U (en) * 1982-09-20 1984-03-26 マツダ株式会社 Engine throttle valve control device
JPH0464788U (en) * 1990-10-17 1992-06-03

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154682A (en) * 1982-03-09 1983-09-14 Mitsubishi Electric Corp Detector of substance
JPS5945247U (en) * 1982-09-20 1984-03-26 マツダ株式会社 Engine throttle valve control device
JPH0464788U (en) * 1990-10-17 1992-06-03

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