JPS5728270A - Direction finder - Google Patents

Direction finder

Info

Publication number
JPS5728270A
JPS5728270A JP10296680A JP10296680A JPS5728270A JP S5728270 A JPS5728270 A JP S5728270A JP 10296680 A JP10296680 A JP 10296680A JP 10296680 A JP10296680 A JP 10296680A JP S5728270 A JPS5728270 A JP S5728270A
Authority
JP
Japan
Prior art keywords
period
receiving
synchronous detector
measuring device
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
JP10296680A
Other languages
Japanese (ja)
Inventor
Keiichi Egashira
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP10296680A priority Critical patent/JPS5728270A/en
Publication of JPS5728270A publication Critical patent/JPS5728270A/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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/58—Rotating or oscillating beam systems using continuous analysis of received signal for determining direction in the plane of rotation or oscillation or for determining deviation from a predetermined direction in such a plane
    • G01S3/66—Narrow-beam systems producing in the receiver a pulse-type envelope signal of the carrier wave of the beam, the timing of which is dependent upon the angle between the direction of the transmitter from the receiver and a reference direction from the receiver; Overlapping broad-beam systems defining in the receiver a narrow zone and producing a pulse-type envelope signal of the carrier wave of the beam, the timing of which is dependent upon the angle between the direction of the transmitter from the receiver and a reference direction from the receiver
    • G01S3/68—Narrow-beam systems producing in the receiver a pulse-type envelope signal of the carrier wave of the beam, the timing of which is dependent upon the angle between the direction of the transmitter from the receiver and a reference direction from the receiver; Overlapping broad-beam systems defining in the receiver a narrow zone and producing a pulse-type envelope signal of the carrier wave of the beam, the timing of which is dependent upon the angle between the direction of the transmitter from the receiver and a reference direction from the receiver wherein the timing of the pulse-type envelope signal is indicated by cathode-ray tube

Landscapes

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

Abstract

PURPOSE:To enable the accurate direction finding to be readily performed by detecting the variation period of the receiving radiowave which varies periodically, and measuring the direction of the arriving radiowave in synchronization with said period. CONSTITUTION:A receiving antenna 5 which is driven by a rotating device 4 is connected to a receiver 3. The output of the receiver 3 is connected to a measuring device 6 and a synchronous detector 7. When a transmitting antenna 2 is stationary, the receiving electric field is steady and the direction can be readily found. However, when the antenna 2 begins to rotate, the field intensity periodically varies as shown in the Figure. The synchronous detector 7 stops the direction finding operation of the measuring device 6 by a DC voltage b, and detects a period S, time t when the maximum signal E appears during said period, and a time length W of E. Then, the synchronous detector 7 offsets the DC voltage b, controls the measuring device 6 via a synchronization control device 8, and makes the receiving device 6 perform the direction measurement at the time t for the time length W, repeatedly. In this way, erroneous measurement due to side lobe is avoided, and the accurate direction measurement can be performed.
JP10296680A 1980-07-25 1980-07-25 Direction finder Pending JPS5728270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10296680A JPS5728270A (en) 1980-07-25 1980-07-25 Direction finder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10296680A JPS5728270A (en) 1980-07-25 1980-07-25 Direction finder

Publications (1)

Publication Number Publication Date
JPS5728270A true JPS5728270A (en) 1982-02-15

Family

ID=14341514

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10296680A Pending JPS5728270A (en) 1980-07-25 1980-07-25 Direction finder

Country Status (1)

Country Link
JP (1) JPS5728270A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100882351B1 (en) 2007-03-14 2009-02-12 한국전자통신연구원 Apparatus and Method for tracing position and direction of radio frequency transceiver
JP2013137277A (en) * 2011-12-28 2013-07-11 Mitsubishi Electric Corp Azimuth measuring device
EP3121616A1 (en) * 2015-07-22 2017-01-25 Rohde & Schwarz GmbH & Co. KG Positioning device and positioning method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100882351B1 (en) 2007-03-14 2009-02-12 한국전자통신연구원 Apparatus and Method for tracing position and direction of radio frequency transceiver
US7724191B2 (en) 2007-03-14 2010-05-25 Electronics And Telecommunications Research Institute Apparatus and method for tracing position and direction of target object through RF signal
JP2013137277A (en) * 2011-12-28 2013-07-11 Mitsubishi Electric Corp Azimuth measuring device
EP3121616A1 (en) * 2015-07-22 2017-01-25 Rohde & Schwarz GmbH & Co. KG Positioning device and positioning method

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