US2117848A - Direction finding method - Google Patents

Direction finding method Download PDF

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Publication number
US2117848A
US2117848A US70790A US7079036A US2117848A US 2117848 A US2117848 A US 2117848A US 70790 A US70790 A US 70790A US 7079036 A US7079036 A US 7079036A US 2117848 A US2117848 A US 2117848A
Authority
US
United States
Prior art keywords
directional antenna
frame
antenna
aerial
amplitude
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
US70790A
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English (en)
Inventor
Kramar Ernst
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2117848A publication Critical patent/US2117848A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Definitions

  • the lnvention proposes to provide for a permanent combination of the frame aerial with a non-directional antenna effect and to cause a non-directional antenna effect of double the magnitude of the first said non-directional antenna effect to be connected and disconnected alternately and in phase opposition (counter coupling).
  • a non-directional antenna effect of double the magnitude of the first said non-directional antenna effect to be connected and disconnected alternately and in phase opposition (counter coupling).
  • Fig. 1 is a wiring diagram of a high frequency receiver as provided by the invention
  • Figs. 2, 3, and 4 are diagrams relating to the operation of this receiver.
  • Fig. 1 E denotes the input tube of the receiver, the details of which are not shown as they are immaterial to the idea of the invention.
  • the frame or loop aerial is designated R.
  • a non-directional antenna H or a predetermined non-directional antenna eifect of the aerial R Connected to the grid of the tube E is a non-directional antenna H or a predetermined non-directional antenna eifect of the aerial R.
  • the grid circuit of the tube E is coupled also to a nondirectional antenna 2H by an inductive coupling K.
  • the high frequency energy received by the antenna 2H is double the energy received by the antenna H and is coupled at K in phase opposition to the energy received by H, the latter fact being indicated by the minus sign.
  • a switching device S is included by which the energy is added in a rhythm adapted for obtaining bearings, such as a dot (Cl. Z50-11) rhythm, the pauses corresponding to the dashes intervening between the dots.
  • Fig. 2 The diagrams corresponding to the several an tennas and the resultant cardioids are represented in Fig. 2.
  • the amplitude of the nondirectional antenna 2H is likewise denoted by 2-I, that is to say, is exactly double that of the antenna H
  • the bearing beam Q is directed forward, that is to say, is normal to the plane of the frame aerial.
  • the coupling K By varying the coupling K, such variation resulting in an amplitude variation of the second nonedirectional antenna effect, beam Q can be rotated in the manner appearing from Figs. 3 and 4.
  • the diagrams of Fig. 3 are due to an amplitude less than 2H
  • those of Fig. 4 are due to an amplitude greater than 2H. In this way, when a vehicle carrying the direction nding arrangement happens to be olf the proper course the drift may be compensated.
  • the device S is preferably a tripping device or saw tooth generator of a well-known type, whose tripping oscillation is made to accord with the keying rhythm.
  • a commutator arrangement may of course be provided instead, but a saw tooth generator, has the advantage of being simpler than this.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
US70790A 1935-03-26 1936-03-25 Direction finding method Expired - Lifetime US2117848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL87790D DE639458C (de) 1935-03-26 1935-03-26 Verfahren zur Zielpeilung

Publications (1)

Publication Number Publication Date
US2117848A true US2117848A (en) 1938-05-17

Family

ID=6538794

Family Applications (1)

Application Number Title Priority Date Filing Date
US70790A Expired - Lifetime US2117848A (en) 1935-03-26 1936-03-25 Direction finding method

Country Status (5)

Country Link
US (1) US2117848A (fi)
DE (1) DE639458C (fi)
FR (1) FR803767A (fi)
GB (1) GB453565A (fi)
NL (1) NL42433C (fi)

Also Published As

Publication number Publication date
FR803767A (fr) 1936-10-08
GB453565A (en) 1936-09-14
NL42433C (fi) 1938-01-15
DE639458C (de) 1936-12-05

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