JPS59218973A - On-vehicle obstacle detector - Google Patents

On-vehicle obstacle detector

Info

Publication number
JPS59218973A
JPS59218973A JP9689984A JP9689984A JPS59218973A JP S59218973 A JPS59218973 A JP S59218973A JP 9689984 A JP9689984 A JP 9689984A JP 9689984 A JP9689984 A JP 9689984A JP S59218973 A JPS59218973 A JP S59218973A
Authority
JP
Japan
Prior art keywords
ultrasonic
signal
wave
obstacle
comparator
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
JP9689984A
Other languages
Japanese (ja)
Inventor
Tadayoshi Makino
Shozo Honda
Tsuneo Hikokubo
Original Assignee
Matsushita Electric Ind 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 Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Priority to JP9689984A priority Critical patent/JPS59218973A/en
Publication of JPS59218973A publication Critical patent/JPS59218973A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523Details of pulse systems
    • G01S7/526Receivers

Abstract

PURPOSE:To detect an obstacle precisely by changing the level of reference voltage to be applied to a comparator to detect the reflected wave of an ultrasonic tone burst wave from an obstacle in response to the propagation distance of ultrasonic wave. CONSTITUTION:The ultrasonic tone burst wave is formed by a tone burst generating circuit 2 and radiated into air by an ultrasonic transmitter 3. The reflected wave from the obstacle is received by an ultrasonic wave receiver 4 and amplified up to a proper level and detected by an amplifier/detecting circuit 5. The detected receiving signal is decided to be received or not in accordance with the status whether the signal exceeds a fixed level or not. A signal to be reduced in accordance with the time elapsed which is shown in 107 is used as a reference signal of the comparator 6. The reference voltage inputted to the comparator 6 is reduced in accordance with the time elapsed, i.e. the increase of the propagation distance of the ultrasonic wave, so that a signal with low amplitude can be also detected at its reception without malfunction. The distance up to the object can be calculated by measuring the time from transmission to reception by a counter 8 and processing the counted value by an arithmetic circuit 9.
JP9689984A 1984-05-15 1984-05-15 On-vehicle obstacle detector Pending JPS59218973A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9689984A JPS59218973A (en) 1984-05-15 1984-05-15 On-vehicle obstacle detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9689984A JPS59218973A (en) 1984-05-15 1984-05-15 On-vehicle obstacle detector

Publications (1)

Publication Number Publication Date
JPS59218973A true JPS59218973A (en) 1984-12-10

Family

ID=14177216

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9689984A Pending JPS59218973A (en) 1984-05-15 1984-05-15 On-vehicle obstacle detector

Country Status (1)

Country Link
JP (1) JPS59218973A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62254087A (en) * 1986-04-25 1987-11-05 Omron Tateisi Electronics Co Ultrasonic type distance measuring apparatus
JPH05210800A (en) * 1992-01-30 1993-08-20 Stanley Electric Co Ltd Obstacle sensor for automobile
CN101782648A (en) * 2010-03-05 2010-07-21 圆展科技股份有限公司 Ultrasonic wave receiving module, detecting system as well as detecting method and physical camera thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572880A (en) * 1978-11-27 1980-06-02 Nec Corp Processor for sonar video signal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572880A (en) * 1978-11-27 1980-06-02 Nec Corp Processor for sonar video signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62254087A (en) * 1986-04-25 1987-11-05 Omron Tateisi Electronics Co Ultrasonic type distance measuring apparatus
JPH05210800A (en) * 1992-01-30 1993-08-20 Stanley Electric Co Ltd Obstacle sensor for automobile
CN101782648A (en) * 2010-03-05 2010-07-21 圆展科技股份有限公司 Ultrasonic wave receiving module, detecting system as well as detecting method and physical camera thereof

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