JPS57103071A - Direction finder - Google Patents

Direction finder

Info

Publication number
JPS57103071A
JPS57103071A JP17935680A JP17935680A JPS57103071A JP S57103071 A JPS57103071 A JP S57103071A JP 17935680 A JP17935680 A JP 17935680A JP 17935680 A JP17935680 A JP 17935680A JP S57103071 A JPS57103071 A JP S57103071A
Authority
JP
Japan
Prior art keywords
target
antennas
frequency
intermediate frequency
agc
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
JP17935680A
Other languages
Japanese (ja)
Inventor
Eisuke Tomota
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 JP17935680A priority Critical patent/JPS57103071A/en
Publication of JPS57103071A publication Critical patent/JPS57103071A/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
    • G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems

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 achieve direction finding with a simple constitution, without accuracies of AGC and voltage drifting, by receiving a linear FM signal radiated from a target with two sets of antennas, and determining the direction information based on the frequency difference between a converted intermediate frequency signals. CONSTITUTION:When a linear FM signal radiated from a target 1 is received at two sets of antennas 2, 3, since a distance between the antennas 2 and 3 and the target 1 is different, a frequency signal of a converted intermediate frequency signal corresponding to the reception wave at receivers 6 and 7 is different each other. The frequency difference of the intermediate frequency signals corresponding to the direction information of the target 1 is detected at a mixer 9, the difference processing without effect of accuracy such as AGC and voltage drift is made, to achieve direction finding for the frequency region with a simple constitution such as an analog/digital filter and a spectrum analyzer and the like.
JP17935680A 1980-12-18 1980-12-18 Direction finder Pending JPS57103071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17935680A JPS57103071A (en) 1980-12-18 1980-12-18 Direction finder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17935680A JPS57103071A (en) 1980-12-18 1980-12-18 Direction finder

Publications (1)

Publication Number Publication Date
JPS57103071A true JPS57103071A (en) 1982-06-26

Family

ID=16064406

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17935680A Pending JPS57103071A (en) 1980-12-18 1980-12-18 Direction finder

Country Status (1)

Country Link
JP (1) JPS57103071A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0474984A (en) * 1990-07-14 1992-03-10 Matsushita Electric Works Ltd Phase monopulse circuit of automatically tracking antenna for satellite broadcasting receiving

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0474984A (en) * 1990-07-14 1992-03-10 Matsushita Electric Works Ltd Phase monopulse circuit of automatically tracking antenna for satellite broadcasting receiving

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