GB2007065A - Direction finding system - Google Patents

Direction finding system

Info

Publication number
GB2007065A
GB2007065A GB7841298A GB7841298A GB2007065A GB 2007065 A GB2007065 A GB 2007065A GB 7841298 A GB7841298 A GB 7841298A GB 7841298 A GB7841298 A GB 7841298A GB 2007065 A GB2007065 A GB 2007065A
Authority
GB
United Kingdom
Prior art keywords
pair
angle
difference signal
basis
taken
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.)
Granted
Application number
GB7841298A
Other versions
GB2007065B (en
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.)
Saab AB
Original Assignee
Saab Scania AB
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 Saab Scania AB filed Critical Saab Scania AB
Publication of GB2007065A publication Critical patent/GB2007065A/en
Application granted granted Critical
Publication of GB2007065B publication Critical patent/GB2007065B/en
Expired 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
    • G01S3/48—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 the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
    • 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
    • G01S3/04—Details
    • G01S3/06—Means for increasing effective directivity, e.g. by combining signals having differently oriented directivity characteristics or by sharpening the envelope waveform of the signal derived from a rotating or oscillating beam antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/002—Antennas or antenna systems providing at least two radiating patterns providing at least two patterns of different beamwidth; Variable beamwidth antennas

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)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Surgical Instruments (AREA)

Abstract

An antenna array for direction determination comprises two pairs of elongated end-firing log-periodic antenna elements 1, 2 and 3, 4, each pair fixed symmetrically to a reference plane 5 and forwardly convergent to it. The two antenna elements of one pair converge forwardly at an angle b, those of the other pair converge at an angle a = 1.5 b. From the detected and amplified signals of each pair there is obtained a difference signal designated L1, for the b-angle pair, L2 for the a-angle pair. A third difference signal L3 is obtained from L2-L1. The magnitude of each difference signal depends upon value of an angle V between a boresight axis 12 and a detected radiation source. An indication of V is taken on the basis of L1 if L1, L2 and L3 are on the same side of zero. A more precise indication of V is then taken on the basis of L2 by comparing absolute value of L2 with the absolute value of an adjustable reference signal. <IMAGE>
GB7841298A 1977-10-25 1978-10-20 Electromagnetic radiation sensor Expired GB2007065B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7711967A SE411596B (en) 1977-10-25 1977-10-25 FOR ELECTROMAGNETIC RADIATION SENSITIVE DEVICE, FITTED TO LOCATE A TRANSMITTER

Publications (2)

Publication Number Publication Date
GB2007065A true GB2007065A (en) 1979-05-10
GB2007065B GB2007065B (en) 1982-04-28

Family

ID=20332670

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7841298A Expired GB2007065B (en) 1977-10-25 1978-10-20 Electromagnetic radiation sensor

Country Status (7)

Country Link
JP (1) JPS54102849A (en)
DE (1) DE2845989C2 (en)
DK (1) DK150556C (en)
FR (1) FR2407486A1 (en)
GB (1) GB2007065B (en)
NO (1) NO145255C (en)
SE (1) SE411596B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250153A (en) * 1984-09-24 1992-05-27 Siemens Ag Discovering hovering helicopters
GB2281671A (en) * 1993-08-24 1995-03-08 Cossor Electronics Ltd Monopulse receiver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59507604D1 (en) * 1994-10-25 2000-02-17 Daimler Chrysler Ag RF seeker antenna system for missiles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023172A (en) * 1959-12-17 1977-05-10 Numax Electronics Incorporated Monopulse system for cancellation of side lobe effects
US3761927A (en) * 1972-03-20 1973-09-25 United Aircraft Corp Rf phase detected interferometer radar
GB1337099A (en) * 1972-05-17 1973-11-14

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250153A (en) * 1984-09-24 1992-05-27 Siemens Ag Discovering hovering helicopters
GB2250153B (en) * 1984-09-24 1992-10-14 Siemens Ag Methods of and systems for discovering hovering helicopters
GB2281671A (en) * 1993-08-24 1995-03-08 Cossor Electronics Ltd Monopulse receiver
GB2281671B (en) * 1993-08-24 1997-07-09 Cossor Electronics Ltd Improvements relating to radar antenna systems

Also Published As

Publication number Publication date
DK150556C (en) 1988-02-08
NO145255C (en) 1982-02-10
NO783602L (en) 1979-04-26
FR2407486B1 (en) 1984-10-26
FR2407486A1 (en) 1979-05-25
JPS54102849A (en) 1979-08-13
SE411596B (en) 1980-01-14
DE2845989C2 (en) 1983-08-18
DE2845989A1 (en) 1979-04-26
DK150556B (en) 1987-03-23
SE7711967L (en) 1979-04-26
GB2007065B (en) 1982-04-28
DK471578A (en) 1979-04-26
NO145255B (en) 1981-11-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19961020