GB1475289A - Direction finders - Google Patents

Direction finders

Info

Publication number
GB1475289A
GB1475289A GB4612173A GB4612173A GB1475289A GB 1475289 A GB1475289 A GB 1475289A GB 4612173 A GB4612173 A GB 4612173A GB 4612173 A GB4612173 A GB 4612173A GB 1475289 A GB1475289 A GB 1475289A
Authority
GB
United Kingdom
Prior art keywords
signals
oscillator
aerial
phase
aerials
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.)
Expired
Application number
GB4612173A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB4612173A priority Critical patent/GB1475289A/en
Priority to FR7430533A priority patent/FR2284887A1/en
Publication of GB1475289A publication Critical patent/GB1475289A/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
    • G01S3/143—Systems for determining direction or deviation from predetermined direction by vectorial combination of signals derived from differently oriented antennae

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1475289 Radio direction finders MARCONI CO Ltd 9 July 1974 [3 Oct 1973] 46121/73 Heading H4D A radio direction finder comprises two directional aerials, a pair of matched gain R.F. or I.F. amplifiers associated with the aerials, and means for comparing the amplitudes of the A.C. output signals of the amplifiers to determine bearing information. Said means includes samplying circuits for producing D.C. signals representative of signal peak amplitudes, and means for comparing the two D.C. signals. As described, a direction finder includes two crossed loop aerials 10, 12 and a dipole aerial 14. Each aerial feeds into a respective R.F. amplifier/ mixer 16 followed by an I.F. amplifier 20. The mixers all receive second inputs from a common local oscillator 18. The I.F. amplifiers associated with the loop aerials have a common AGC unit 29, to enable their gains to be matched. The I.F. amplifier associated with the dipole aerial feeds into a phase discriminator 21 which is connected in the feedback loop of a voltage controlled oscillator 23, and serves to lock the frequency and phase of said oscillator in correspondence with the signal received by the aerial 14. The oscillator 23 provides two signals which are in phase quadrature with one another, and each of said signals is used to control an electronic sampling switch 22a and as input to a modulator 24. The sampling switches 22a operate on the output signals from the I.F. amplifiers 20 associated with the loop aerials 10, 12 and reservoir capacitors 22b give D.C. voltages representative of the amplitudes of those signals, which are fed to the modulating inputs of the modulators 24. The outputs of said modulators, which are in phase quadrature, are added in an adder 26, and the relative phase of the resultant, which indicates without ambiguity the direction of incidence of the received radio waves, is determined by a phase comparator 28 with reference to a second input thereto, from the oscillator 23. An audio monitor 27 is provided, receiving input from the I.F. amplifier associated with the aerial 14.
GB4612173A 1973-10-03 1973-10-03 Direction finders Expired GB1475289A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4612173A GB1475289A (en) 1973-10-03 1973-10-03 Direction finders
FR7430533A FR2284887A1 (en) 1973-10-03 1974-09-10 DIRECTION INDICATOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4612173A GB1475289A (en) 1973-10-03 1973-10-03 Direction finders

Publications (1)

Publication Number Publication Date
GB1475289A true GB1475289A (en) 1977-06-01

Family

ID=10439926

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4612173A Expired GB1475289A (en) 1973-10-03 1973-10-03 Direction finders

Country Status (2)

Country Link
FR (1) FR2284887A1 (en)
GB (1) GB1475289A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489327A (en) * 1981-03-24 1984-12-18 Racal Communications Equipment Limited Direction finding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998018018A1 (en) * 1996-10-24 1998-04-30 Northern Telecom Limited Determining direction of a mobile terminal in a cellular communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489327A (en) * 1981-03-24 1984-12-18 Racal Communications Equipment Limited Direction finding

Also Published As

Publication number Publication date
FR2284887A1 (en) 1976-04-09

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Legal Events

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