JPS5679974A - Obstruction detector - Google Patents

Obstruction detector

Info

Publication number
JPS5679974A
JPS5679974A JP15770379A JP15770379A JPS5679974A JP S5679974 A JPS5679974 A JP S5679974A JP 15770379 A JP15770379 A JP 15770379A JP 15770379 A JP15770379 A JP 15770379A JP S5679974 A JPS5679974 A JP S5679974A
Authority
JP
Japan
Prior art keywords
receiver
obstruction
received
transmitter
antenna
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
JP15770379A
Other languages
Japanese (ja)
Inventor
Hisayoshi Ueno
Toshio Akaogi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15770379A priority Critical patent/JPS5679974A/en
Publication of JPS5679974A publication Critical patent/JPS5679974A/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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/003—Bistatic radar systems; Multistatic radar systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

PURPOSE:To enable an obstruction to be detected with simple constitution by using a transmitter and a receiver of microwaves and setting the directional characteristics thereof suitably. CONSTITUTION:If an obstruction exists in the part 13 where the directional characteristics of a transmitter 1 and a receiver 4 superpose, part of the reflected waves is received in the antenna 5 of the receiver 4. The microwave signal received in the antenna 5 is detected by a detector 6, is amplified by an amplifier 7 and is further compared with a reference voltage by a comparator 9. When the received level is higher than the reference voltage, an alarm is emitted from an alarm display device 10.
JP15770379A 1979-12-05 1979-12-05 Obstruction detector Pending JPS5679974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15770379A JPS5679974A (en) 1979-12-05 1979-12-05 Obstruction detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15770379A JPS5679974A (en) 1979-12-05 1979-12-05 Obstruction detector

Publications (1)

Publication Number Publication Date
JPS5679974A true JPS5679974A (en) 1981-06-30

Family

ID=15655523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15770379A Pending JPS5679974A (en) 1979-12-05 1979-12-05 Obstruction detector

Country Status (1)

Country Link
JP (1) JPS5679974A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4995330A (en) * 1973-01-19 1974-09-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4995330A (en) * 1973-01-19 1974-09-10

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