US2687521A - Direction finder installation - Google Patents

Direction finder installation Download PDF

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Publication number
US2687521A
US2687521A US252663A US25266351A US2687521A US 2687521 A US2687521 A US 2687521A US 252663 A US252663 A US 252663A US 25266351 A US25266351 A US 25266351A US 2687521 A US2687521 A US 2687521A
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US
United States
Prior art keywords
winding
stationary
windings
goniometer
direction finder
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 - Lifetime
Application number
US252663A
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English (en)
Inventor
Troost Albert
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.)
Telefunken AG
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Telefunken AG
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Filing date
Publication date
Application filed by Telefunken AG filed Critical Telefunken AG
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Publication of US2687521A publication Critical patent/US2687521A/en
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    • 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
    • G01S3/023—Monitoring or calibrating
    • 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
    • G01S3/08—Means for reducing polarisation errors, e.g. by use of Adcock or spaced loop antenna systems

Definitions

  • the present invention relates to a direction finder installation and a method for ascertaining the operating condition of the parts thereof.
  • a method according to the present invention comprises in its broadest aspects the steps of generating a high frequency voltage, and coupling the high frequency voltage to the parts of the direction finder installation.
  • a direction finder installation comprises in combination a plurality of directional antennas arranged symmetrically with respect to one another, a goniometer having a plurality of stationary windings arranged symmetrically with respect to one another and being connected, respectively, to the directional antennas, a rotatable winding forming part of the goniometer, means for locally generating a high frequency voltage, andswitching means for connecting the stationary windings simultaneously to the generating means whereby the high frequency voltage is applied by the switching means simultaneously to the stationary windings and the directional antennas connected therewith so that the operative condition thereof can be ascertained by rotating the rotatable winding of the goniometer into a position v of extremal current response.
  • an amplifier including an oscillating stage is connected to the rotatable winding of the goniometer and the high frequency is generated in the oscillating stage of the amplifier.
  • the switching means include stationary contacts connected, respectively, to the terminals of the stationary windings, and movable contacts connected to the oscillating stage of the amplifier.
  • '"Preferably”condensers are in of the direction findmovable contacts l2 stationary contact IZa" 'serted, respectively, between the stationarycontacts and the terminals of the stationarywind- I
  • thedirection finder installation comprises a plurality, preferably two directional antennas l and 2 such as frames or loops which include with each other an angle of 90.
  • the "antennas l and 2 are connected, respectively, over two cables 3 and 4 to the stationary field windings 5 and Bof a goniometer which include an angle of 90 with each other.
  • the rotatable winding I of the goniometer is connected to the tuning condenser 8 which is connectedbetween a cathodeand the grid of the first tube 9"of an amplifier.
  • the cables 3 and 4 are only-diagrammatically indicated in the drawing, andit should be understood'that the directional antennas or loops [and 2 .can be arranged remote from the goniometer, the cables 3 and 4 having in this case' a considerable length.
  • It! is an oscillating or mixing stage, preferably the second oscillator ormixer of the amplifier the first tube 9 of which is connected'to' the tuning condenser E and the rotatable winding 1 of the goniometeiz- Theoscillating or mixing stage logenerates a high frequency voltage having as a rule a frequency of kilocycles per'second which is-appliedto a cable!
  • output of the amplifier is supplied to an indicator I9 which may be any type of indicator known in the art.
  • the entire arrangement including stage 9, oscillator l0, amplifier l8 and indicator l9 comprise the indicator means I! which is connected to the rotatable winding 1 of the goniometer.
  • the high frequency voltage could be coupled with the directional antennas by a system of conductors consisting of two coils arranged at right angles to each other and symmetrically with respect to the directional antennas.
  • the switch I2 is closed either to make contact with the stationary contacts Ma and 12a or with the stationary contacts l2b' and I21)".
  • the high frequency voltage generated by the oscillating stage l of the amplifier is coupled with the stationary windings and 6, the cables 3 and 4 and the directional antennas l and 2.
  • the receiver of the direction finder installation is tuned to a harmonic, preferably the third harmonic, of the high frequency voltage generated by the second oscillating or mixing stage In. Then the rotatable winding is rotated until an extremal, i. e. a minimum or maximum current response is obtained. If all the parts of the direction finder installation are in good operative condition the extremal, i. e. the maximum or minimum current response of the rotating winding will occur when the latter includes an angle of 45 with each of the stationary windings 5, 6 because in this case the stationary windings are excited equally by the high frequency voltage or the harmonic thereof.
  • a particular advantage of the present invention consists in that faults of the direction finder installation can be recognized at the working place of the person operating the goniometer so that the operator has not to go as far as the remote place of the directional antennas l and 2.
  • the two positions l2 are provided in order to ascertain faults caused by a defect of parts of the stationary windings 5. and/or 6 of the goniometer.
  • a direction finder installation in combination, a plurality of directional antennas arranged symmetrically with respect to one another; a goniometer having a plurality of stationary windings arranged. symmetrically with respect to one another and connected, respectively, to said directional antennas; a rotatable winding forming part of said goniometer, said goniometer being arranged remote from said directional antennas; connections connecting, respec-r tively, said stationary windings of said goniometer with said directional antennas; an amplifier connected to said rotatable winding of said goniometer, said amplifier including an oscillating stage;
  • a system for testing the performance of a direction finder installation including a first and a seconddirective antenna arranged symmetricallywith respect to each other, a goniometer having a pair of relatively stationary windings connected to said first and said second antenna, respectively, as well as a third winding movable with respect to said pair of windings, and indicatOr means. connected to said third winding; said system comprising a local source of high frequency voltage and connecting means for irne pressing said high-frequency voltage simultaneously upon both of said stationary windings and both of said antennas, thereby producing in said goniometer an electro-magnetic field whose. direction, as ascertained through said indicator means upon rotation of said third winding, is
  • saidsystem comprising a local source of highfrequencyvoltage and connecting means for impressing said high-frequency voltage upon a portion of each of said stationary windings and in bucking: relation thereto upon another portion ofeach of said stationary windings in series with the respective one of said antennas, thereby pro-.
  • a system for testing the performance of a direction finder installation including a first and a second directive antenna arranged symmetrically with respect to each other, a goniometer having a pair of relatively stationary windings connected across said first and said second antenna, respectively, as well as a winding movable with respect to said pair of windings, and indicator means connected to said third winding; said system comprising a local source of high-frequency voltage and circuit means for connecting said source between the midpoint of each of said stationary windings and a point intermediate each stationary winding and the respective antenna, thereby producing in said goniometer an electromagnetic field whose direction, as ascertained through said indicator means upon rotation of said third winding, is dependent upon the relative impedances of said stationary windings and said antennas, whereby a departure of any of said impedances from normal may be determined from a deviation of said field from a predetermined orientation.
  • a system for testing the performance of a direction finder installation including a first and a second directive antenna arranged symmetrically with respect to each other, a goniometer having a pair of relatively stationary windings connected across said first and said second antenna, respectively, as well as a third winding movable with respect to said pair of windings, and
  • said system comprising a local source of highfrequency voltage, circuit means connecting an output terminal of said source to the midpoint of each of said stationary windings, and switch means for connecting another output terminal of said source selectively to a point intermediate each antenna and either half of the respective stationary windings, thereby producing in said goniometer an electromagnetic field whose direction, as ascertained through said indicator means upon rotation of said winding, is dependent upon the relative impedance of said stationary windings and said antennas, whereby the presence of a defect in either of said stationary windings and antennas may be determined from a deviation of said field from a predetermined orientation, operation of said switch means to reverse the connection between said source and said winding halves enabling identification of the defective antenna or winding half.
  • a first and a second directive antenna arranged symmetrically with respect to each otherya-gohiometer having a pair of relatively ing, is'dependent upon the relative impedances of said stationary windings and said antennas, whereby a departure of any of said impedances from normal may be determined from a deviation of'said field froma-predetermined orientation.
  • a first and a second directive antenna arranged symmetrically with respect to each other; a goniometer having a pair of relatively stationary windings connected to said first and said second antenna, respectively, as well as a third winding movable with respect to said pair of win-dings; indicator'means connected to said third winding, said indicator means including an amplifier provided with a mixing stage, oscillator means in said mixing stage, and an input circuit for said amplifier tuned to a harmonic of the output of said oscillator means; and circuit means connecting said oscillator means to both of said stationary windings and both of said antennas in a manner producing in said goniometer an electromagnetic field whose direction, as ascertained through said indicator means upon rotation of said third winding, is dependent upon the relative impedances of said stationary windings and said antennas, whereby a departure of any of said impedances from normal may be determined from a deviation of said field from a predetermined orientation.
  • a method of testing the performance of a direction finder installation including a first and a second directive antenna arranged symmetrically with respect to each other, a goniometer having a pair of relatively stationary windings connected to said first and said second antenna, respectively, as Well as a third winding movable with respect to said pair of windings, and indicator means connected to said third winding; said method comprising the steps of locally generating a high-frequency voltage, applying said voltage simultaneously to both of said stationary windings and both of said antennas in a manner producing in said goniometer an electromagneticfield whose direction is dependent upon the relative impedances of said stationary windings and said antennas, and determining the orientation of said field by rotating said third winding to a position of extreme response of said indicator means.
  • a method of testing the performance of a direction finder installation including a first and a second directive antenna arranged symmetrically with respect to each other, a goniometer having" a pair of relatively stationary windings connected to said first and said second antenna,
  • said method comprising the steps of locally generating a high-frequency voltage producing a first magnetic field in each of said stationary windings by applying said voltage to a portion thereof, simultaneously producing a second mag-' netic field or" different magnitude from said first field, and in bucking relation thereto, in each of said stationary windings by applying said voltage to another portion therof in series with the respective antenna, and determining theexistence of any cit-normal orientation of the resultin magnetic field by rotating said third winding to a position of extreme response of said indicator means.
  • a method of testing the performance of a direction finder installation including a first and a second directive antenna arranged symmetrioally with respect having a pair of ary windings by applying said voltage to the other half of each of said stationary windings in series with the respective antenna,

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  • 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)
  • Monitoring And Testing Of Transmission In General (AREA)
US252663A 1950-10-30 1951-10-23 Direction finder installation Expired - Lifetime US2687521A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE702178X 1950-10-30

Publications (1)

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US2687521A true US2687521A (en) 1954-08-24

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US252663A Expired - Lifetime US2687521A (en) 1950-10-30 1951-10-23 Direction finder installation

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US (1) US2687521A (US20070167544A1-20070719-C00007.png)
BE (1) BE506776A (US20070167544A1-20070719-C00007.png)
FR (1) FR1043966A (US20070167544A1-20070719-C00007.png)
GB (1) GB702178A (US20070167544A1-20070719-C00007.png)
NL (1) NL90308C (US20070167544A1-20070719-C00007.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2137605A1 (US20070167544A1-20070719-C00007.png) * 1971-05-07 1972-12-29 Int Standard Electric Corp

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468028A (en) * 1945-05-12 1949-04-26 Standard Telephones Cables Ltd Method and apparatus for testing direction finders
US2510074A (en) * 1946-05-14 1950-06-06 Int Standard Electric Corp Display arrangement for electric oscillographs
US2582350A (en) * 1941-06-04 1952-01-15 Decca Record Co Ltd Radio beacon system
US2607034A (en) * 1946-04-29 1952-08-12 Maxwell K Goldstein Signal generator system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582350A (en) * 1941-06-04 1952-01-15 Decca Record Co Ltd Radio beacon system
US2468028A (en) * 1945-05-12 1949-04-26 Standard Telephones Cables Ltd Method and apparatus for testing direction finders
US2607034A (en) * 1946-04-29 1952-08-12 Maxwell K Goldstein Signal generator system
US2510074A (en) * 1946-05-14 1950-06-06 Int Standard Electric Corp Display arrangement for electric oscillographs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2137605A1 (US20070167544A1-20070719-C00007.png) * 1971-05-07 1972-12-29 Int Standard Electric Corp

Also Published As

Publication number Publication date
NL90308C (US20070167544A1-20070719-C00007.png)
FR1043966A (fr) 1953-11-13
BE506776A (US20070167544A1-20070719-C00007.png)
GB702178A (en) 1954-01-13

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