GB673679A - Improvements in or relating to direction finding receivers - Google Patents

Improvements in or relating to direction finding receivers

Info

Publication number
GB673679A
GB673679A GB15865/49A GB1586549A GB673679A GB 673679 A GB673679 A GB 673679A GB 15865/49 A GB15865/49 A GB 15865/49A GB 1586549 A GB1586549 A GB 1586549A GB 673679 A GB673679 A GB 673679A
Authority
GB
United Kingdom
Prior art keywords
receiver
null
dipoles
aerials
dipole
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
GB15865/49A
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.)
Sadir Carpentier SA
Original Assignee
Sadir Carpentier SA
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 Sadir Carpentier SA filed Critical Sadir Carpentier SA
Publication of GB673679A publication Critical patent/GB673679A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/06Arrays of individually energised antenna units similarly polarised and spaced apart
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S3/00Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02Direction-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
    • G01S3/04Details
    • G01S3/08Means for reducing polarisation errors, e.g. by use of Adcock or spaced loop antenna systems

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

673,679. Radio direction-finding. SADIR CARPENTIER: June 14, 1949 [June 14, 1948; June 16, 1948; June 16, 1948], Nos. 15866/49, 15866/49, and 15867/49. Class 40 (vii). A rotatable radio direction-finding system of the dipole Adcock type comprises two spaced dipoles and at least one further dipole off the plane of the first two, the whole aerial array being rotatable as a unit and the dipoles being associated with at least one receiver by lines of such electrical lengths as to give zero voltage at the receiver, or all the receivers, only when the azimuth of the incoming signal is in a predetermined relationship with respect to the aerial system. In a first embodiment (Fig. 3) four dipoles and two receivers are used. The first two dipoles A and B are symmetrically connected to receiver E to give a null when they are broadside on to an incoming signal but an ambiguity of 180 degrees remains. The two supplementary dipoles CD, preferably but not essentially situated in a plane at right angles to the plane containing the aerials A and B, are connected by lines F and G of unequal electrical length to a second receiver R, a null being obtained in one but not the other position in which the input to receiver E is a null. Indicator S shows when the double null occurs. The difference in the delay in the two lines F and G must be different from 180 degrees and is, with advantage, made approximately 90 degrees of electrical angle. In a variation of this embodiment the pairs of dipoles AB and CD are connected as described in Specification 662,576, Fig. 4 (not shown), the method of operation is the same. Provided that aerial C is not,in line with aerials A and B the functions of aerials B and D may be combined. Fig. 6 shows such a system wherein 1, 2 is dipole A; 3, 4 dipole B; and 5, 6 dipole C, which is preferably at the vertix of an isosceles triangle ABC. The connections shown are based on the disclosure of the abovementioned Specification, lines 7, 8 and 9, 10 being of the same length and giving null conditions with 180 degrees bearing ambiguity and receiver E, whilst line 11, 12, differing in electrical length from the others, and interconnected as shown with aerial B gives a null at receiver R at one but not the other null position for receiver E. In other embodiments three aerials and one receiver are used. In these embodiments the dipoles feed the receiver through lines of unequal lengths so chosen that the voltages at the receiver ends thereof have phase differences of 120 degrees in the (unambiguous) null position. The physical aerial layout may be the same as that of the Fig. 6 embodiment, the aerials being connected to the receiver in parallel, Fig. 9 (not shown), or they may be connected in series in a manner based on the disclosure of the above-mentioned Specification, Fig. 10 (not shown). It is pointed out that with systems according to the invention spacing of the aerials A and B may be greater than half a wavelength without ambiguity arising and that larger separations give increased accuracy. Specification 130,490, [Class 40 (ii)], also is referred to.
GB15865/49A 1948-06-14 1949-06-14 Improvements in or relating to direction finding receivers Expired GB673679A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR673679X 1948-06-14

Publications (1)

Publication Number Publication Date
GB673679A true GB673679A (en) 1952-06-11

Family

ID=9018281

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15865/49A Expired GB673679A (en) 1948-06-14 1949-06-14 Improvements in or relating to direction finding receivers

Country Status (1)

Country Link
GB (1) GB673679A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008047158A1 (en) * 2006-10-16 2008-04-24 Roke Manor Research Limited Radio wave detection apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008047158A1 (en) * 2006-10-16 2008-04-24 Roke Manor Research Limited Radio wave detection apparatus

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