JPS56130672A - Obstacle detecting device - Google Patents

Obstacle detecting device

Info

Publication number
JPS56130672A
JPS56130672A JP3406880A JP3406880A JPS56130672A JP S56130672 A JPS56130672 A JP S56130672A JP 3406880 A JP3406880 A JP 3406880A JP 3406880 A JP3406880 A JP 3406880A JP S56130672 A JPS56130672 A JP S56130672A
Authority
JP
Japan
Prior art keywords
signal
level
deciding circuit
pass
amplitude
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
JP3406880A
Other languages
Japanese (ja)
Inventor
Akira Hasegawa
Akira Endo
Hiroyuki Sugao
Kenichi Yamaguchi
Original Assignee
Automob Antipollut & Saf Res Center
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 Automob Antipollut & Saf Res Center filed Critical Automob Antipollut & Saf Res Center
Priority to JP3406880A priority Critical patent/JPS56130672A/en
Publication of JPS56130672A publication Critical patent/JPS56130672A/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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/526—Receivers

Abstract

PURPOSE:To prevent the erroneous detection due to the side lobe and so on, by dividing the receiving signal by fixed levels and by causing these divided signals to pass in divided time bands of repetitive pulses. CONSTITUTION:The ultrasonic wave is radiated from transmission antenna 2 to the external. The ultrasonic wave reflected by the object is received by receiving antenna 3 and is given to amplitude deciding circuit 8 through amplifier 4. Amplitude deciding circuit 8 divides the input signal into a signal higher than the first level and a signal lower than the first level and higher than the second level. Time deciding circuit 9 causes the signal higher than the first level from amplitude deciding circuit 8 to pass in the first time band of the oscillation period of repetitive pulses and causes the signal higher than the second level from amplitude deciding circuit 8 to pass in the second time band and gives them to alarm part 10.
JP3406880A 1980-03-19 1980-03-19 Obstacle detecting device Pending JPS56130672A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3406880A JPS56130672A (en) 1980-03-19 1980-03-19 Obstacle detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3406880A JPS56130672A (en) 1980-03-19 1980-03-19 Obstacle detecting device

Publications (1)

Publication Number Publication Date
JPS56130672A true JPS56130672A (en) 1981-10-13

Family

ID=12403931

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3406880A Pending JPS56130672A (en) 1980-03-19 1980-03-19 Obstacle detecting device

Country Status (1)

Country Link
JP (1) JPS56130672A (en)

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