US1983729A - Direction finder - Google Patents

Direction finder Download PDF

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Publication number
US1983729A
US1983729A US460574A US46057430A US1983729A US 1983729 A US1983729 A US 1983729A US 460574 A US460574 A US 460574A US 46057430 A US46057430 A US 46057430A US 1983729 A US1983729 A US 1983729A
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US
United States
Prior art keywords
aerial
inductance
connection
directional
ground
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
US460574A
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English (en)
Inventor
Bellini Ettore
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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Filing date
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Application filed by CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
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Publication of US1983729A publication Critical patent/US1983729A/en
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Expired - Lifetime legal-status Critical Current

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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
    • G01S3/04—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
    • G01S3/065—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 by using non-directional aerial
    • 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
    • G01S3/12—Means for determining sense of direction, e.g. by combining signals from directional antenna or goniometer search coil with those from non-directional antenna

Definitions

  • France a corporation of France Application June 12, 1930, Serial No. 460,574 In France June 25, 1929 6 Claims.
  • This extinction may be imperfect due to two reasons: (1) The superposition on the direct wave of a reflected or refracted wave which arrives in a different direction and with a different phase than the phase of the direct wave. There does not appear to exist a remedy for this cause of extinction, except for particular cases. (2) The superposition on the action of the loop of a vertical effect, that is of the action of the loop itself (or of the action of two fixed loops) functioning in auxiliary manner as vertical antenna.
  • the invention which is the object of the present patent aims at the elimination of the imperfection on the extinction due to the second cause.
  • Figure 1 shows a directional aerial system including means for increasing the directivity of the direction finder
  • FIGS 2 to 5 inclusive show modifications of the arrangement of Figure 1.
  • C (Fig. 1) be a loop whose center point M is connected to the earth T by a thick conductor L. If the self-inductance and the resistance of this conductor L is strictly zero, the extinction should be perfect, supposing that the cause No. 1 does not exist. In actuality, the self-inductance and the resistance, although very small, can never be zero. It follows therefrom that transmitting stations located very close to the radiogoniometer will not produce sharp extinctions or null points in the radiogoniometer receiving characteristics.
  • a sharp extinction is accomplished in this case by having the current of a detuned vertical antenna A influence through an inductance B and an inductance B, the center connection L of the loop C to ground as shown in Figure 2.
  • the sign of the mutual inductance and the coupling between the coils B and B" respectively, inserted in the antenna lead-in and in the center connection L there is found a position for which the extinction is absolute.
  • the condition essential for accomplishing this result consists in that the effective height of the auxiliary antenna A is greater than the height of the loop C functioning as a vertical antenna.
  • the vertical antenna must be placed inthe very axis of the loop. If this is not feasible, the vertical aerial must be placed far enough away from the loop to insure that the feeble current flowing through the vertical antenna exerts no appreciable action on the loop.
  • the auxiliary antenna A will be connected either as shown in Fig. 4, or as indicated in Fig. 5.
  • the antenna coil B influences inductively the coil B, inserted in aconnection between the center of the inducing loops C and C and the earth, the center of the exploring coil C" being likewise grounded, while the input side of amplifier D is connected to one of the armatures of the tuning condenser S.
  • coil B is inserted in the ground connection of exploring coil C".
  • a receiver R which may include amplifiers and a rectifier is connected to the output terminals of the tube D. It is well understood that the invention is subject to numerous variants in its practical application outside of those given above by way of non-limiting examples.
  • directional receiving systems the combination of a. directional aerial circuit, an aperiodic non-directional aerial circuit, a connection between the electrical midpoint of the directional aerial circuit and ground, an inductive coupling between said non-directional aerial and said connection for introducing non-directional aerial effects from said aperiodic non-directional aerial circuit into said connection, and receiving apparatus including a thermionic tube having its input elements associated with said aerial circuits.
  • a frame aerial a non-resonant vertical aerial, a thermionic tube, means for tuning said frame aerial, a connection between the electrical mid- 55 point of said frame aerial and ground, an inductance in said connection, an inductance in said non-resonant vertical aerial coupled to said first named inductance, a connection between one terminal of said tuning means and the control electrode of said thermionic tube and a connection between the filament of said thermionic tube and ground.
  • a directional aerial system the combination of a frame aerial, a non-resonant vertical aerial including an inductance, a connection including a second inductance between the electrical midpoint of the frame aerial and ground and means for introducing compensating current in said last connection including said inductance in said non-resonant vertical aerial coupled to said inductance in said ground connection.
  • a frame aerial circuit having anode, cathode and control electrodes, a non-resonant vertical aerial including an inductance, an'inductance connecting the electrical midpoint of said frame aerial circuit to ground, means for coupling said non-resonant vertical aerial inductance to said last named inductance, a connection between one terminal of said capacity and the control electrode of said relay tube, a connection between the cathode of said relay tube and ground, and a radio receiver connected between the anode and cathode electrodes of said relay tube.
  • a directional frame aerial comprising one or more convolutions of conducting material closed through a tuning capacity, a connection between a point on said convolutions and ground, said connection including a coupling element, a detuned vertical antenna, said antenna including a coupling element adjustably coupled to the coupling element in said ground connection, and thermionic amplifying means having its input electrodes connected between a point on. said convolutions and ground.

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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)
US460574A 1929-06-25 1930-06-12 Direction finder Expired - Lifetime US1983729A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR692659T 1929-06-25

Publications (1)

Publication Number Publication Date
US1983729A true US1983729A (en) 1934-12-11

Family

ID=9038530

Family Applications (1)

Application Number Title Priority Date Filing Date
US460574A Expired - Lifetime US1983729A (en) 1929-06-25 1930-06-12 Direction finder

Country Status (3)

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US (1) US1983729A (xx)
FR (1) FR692659A (xx)
NL (1) NL29745C (xx)

Also Published As

Publication number Publication date
NL29745C (xx)
FR692659A (fr) 1930-11-08

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