JPS5940182A - Rear monitoring device of automobile - Google Patents

Rear monitoring device of automobile

Info

Publication number
JPS5940182A
JPS5940182A JP57150877A JP15087782A JPS5940182A JP S5940182 A JPS5940182 A JP S5940182A JP 57150877 A JP57150877 A JP 57150877A JP 15087782 A JP15087782 A JP 15087782A JP S5940182 A JPS5940182 A JP S5940182A
Authority
JP
Japan
Prior art keywords
approaching car
frequency
signal
car
received signal
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
JP57150877A
Other languages
Japanese (ja)
Inventor
Hironobu Inoue
Original Assignee
Matsushita 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP57150877A priority Critical patent/JPS5940182A/en
Publication of JPS5940182A publication Critical patent/JPS5940182A/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
    • G01S15/00Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88Sonar systems specially adapted for specific applications
    • G01S15/93Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles

Abstract

PURPOSE:To detect only a rear approaching car under no influence of a fixed building and a car running in the opposite direction, and to improve security, by transmitting an ultrasonic wave to the back and detecting its reflected wave from the rear approaching car, and discriminating that the frequency of the received signal shifts to which side of the upper or lower in comparing with the frequency of the transmitted signal by a discriminating circuit. CONSTITUTION:An oscillator 1 and a transmitter 2 are driven to radiate the ultrasonic wave to the back. If there is a rear approaching car, the reflected wave from the approaching car is converted by a receiver 3 into an electric signal, which is amplified by an amplifier 8. An account of relative speed this received signal has a higher frequency than the transmitted signal when the both cars A and B approach each other or a lower frequency when they depart each other. The received signal amplified by the amplifier 8 is mixed with the oscillation signal from the oscillator 1 by a couple of mixers 41 and 42 and detected to obtain a couple of 90 deg. out-of-phase signals. The deciding circuit 5 detects the presence of the approaching car, i.e. the presence of upward- shifted signal on the basis of the relative phase relation between those 90 deg. out-of-phase signals to give a driver a warning of the presence of the approaching car by an alarm device 6.
JP57150877A 1982-08-31 1982-08-31 Rear monitoring device of automobile Pending JPS5940182A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57150877A JPS5940182A (en) 1982-08-31 1982-08-31 Rear monitoring device of automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57150877A JPS5940182A (en) 1982-08-31 1982-08-31 Rear monitoring device of automobile

Publications (1)

Publication Number Publication Date
JPS5940182A true JPS5940182A (en) 1984-03-05

Family

ID=15506325

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57150877A Pending JPS5940182A (en) 1982-08-31 1982-08-31 Rear monitoring device of automobile

Country Status (1)

Country Link
JP (1) JPS5940182A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562677A1 (en) * 1984-04-06 1985-10-11 Bygg Och Transportekonomie Ab METHOD FOR DETECTING THE PRESENCE OF OBSTACLES IN THE OPERATION OF REMOTELY CONTROLLED MACHINES
US4923180A (en) * 1987-12-04 1990-05-08 Intocast Gmbh Feuerfestprodukte Und Giesshilfsmittel Process and apparatus for restoring the lining of metallurgical ladles

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831332U (en) * 1971-08-28 1973-04-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831332U (en) * 1971-08-28 1973-04-17

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562677A1 (en) * 1984-04-06 1985-10-11 Bygg Och Transportekonomie Ab METHOD FOR DETECTING THE PRESENCE OF OBSTACLES IN THE OPERATION OF REMOTELY CONTROLLED MACHINES
US4923180A (en) * 1987-12-04 1990-05-08 Intocast Gmbh Feuerfestprodukte Und Giesshilfsmittel Process and apparatus for restoring the lining of metallurgical ladles

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