US2462058A - System for comparison of phase shift of electric quantities - Google Patents

System for comparison of phase shift of electric quantities Download PDF

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Publication number
US2462058A
US2462058A US737660A US73766047A US2462058A US 2462058 A US2462058 A US 2462058A US 737660 A US737660 A US 737660A US 73766047 A US73766047 A US 73766047A US 2462058 A US2462058 A US 2462058A
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United States
Prior art keywords
phase
rotor
high frequency
circuit
comparison
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
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US737660A
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English (en)
Inventor
Ahier Jean
Selz Jacques
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
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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
    • 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 present invention relates to changes, improvements and modifications in phase shift comparison circuits particularly for direction finders.
  • the object of the present invention is more specifically to provide purely electronic generators of 2-phase currents in order to avoid the drawbacks of the previously employed generators, which were alternators having an awkward Wave shape, or of resistance-equipped collectors of difficult mechanical construction. It provides generators of 2-phase currents that represent an improvement over the structures described in British patent specification No. 556,759 issued to Rene Hardy.
  • the device disclosed in said patent specification provided for applying the same high frequency current to the reversed finders rotor and also to the mid-points 0f the stators two orthogonal windings.
  • this high frequency current is no longer applied to the mid-points of the stators two orthogonal windings, but provision is made for adding the carrier wave to the modulated wave electronically. This arrangement makes it possible to control the scanning of the indicator by two uncoupled channels.
  • the uncoupling is effected by means of two distinct electronic discharge spaces, these two discharge spaces having a single output circuit for each scanning channel.
  • the adjustment of the relative phase of the carrier wave with respect to the modulated wave is preferably effected in the circuit that transmits the carrier wave to the stators of the distributor.
  • the modulated wave is applied to tributors rotor by means of a loose coupling device in order to make practically negligible the variations of impedance resultlngfrom changes in the position of the rotor.
  • Fig. 1 is a schematic of a phase comparison circuit designed according to the teachings contained in said patent specification.
  • Figs. 2, 3, 4, '7 and 8 are various diagrams employed in the description. r
  • Fig. 5 is a schematic of a circuit employing fea tures of the invention.
  • Fig. 6 shows the indication obtained on the screen of a cathode ray tube in radio direction finding systems that employ features of the invention.
  • a 2-phase current generating device I comprises a distributor, e. g. an induction generator of a reversed radiogoniometric finder type. Current proceeding from a high frequency generator is sent into rotor 2 of this distributor, and this rotor 2 is driven at a constant speed in synchronism with the rotor of the goniometers finder.
  • a distributor e. g. an induction generator of a reversed radiogoniometric finder type.
  • Current proceeding from a high frequency generator is sent into rotor 2 of this distributor, and this rotor 2 is driven at a constant speed in synchronism with the rotor of the goniometers finder.
  • the current that passes in rotor 2 induces in stators 3 and t currents whose amplitude is at all times dependent on the position of the said rotor with respect to the windings of the stators.
  • the voltages intended for application to the deflecting elements of the cathode ray oscillograph or other indicator have the shape shown in Fig. 3.
  • one of the voltages is shown in heavy lines and the other in dotted lines, their stagger by a quarter of a period resulting from the relative orthogonal position of stators 3 and 4 of the distributor.
  • H indicates the high frequency oscillator stage that furnishes the carrier wave.
  • an inductance I3 which, at terminals l4, energizes a circuit, one branch of which serves for exciting an electron discharge tube IS.
  • the tuned plate circuit ii of this tube is coupled to an inductance I1 that serves for symmetrically energizing rotor 18 of the induction distributor.
  • Amplifier tube I9 serves for applying to tube a modulation of a suitable kind, e. g. one proceeding from a signal received by a radiogoniometric receiver, shown schematically at 20.
  • of the distributor is grounded, and the other is connected to the grid connection of tubes 22 and 23 respectively.
  • These tubes 22 and 23 are shown as double tubes, each comprising two grids and two anodes.
  • the other branch of the carrier waves circuit energizes in parallel the two opposite grids of the double tubes 22 and 23.
  • the two channels are thus kept de-coupled, although being additive in voltages in the plate circuits of tubes 22 and 23.
  • the plates of these tubes are respectively connected in parallel, and they deliver output into inductances 24 and 25, which act as primary windings with respect to the tuned windings 26 and 21 that symmetrically energize the plates of the double diodes 28 and 29 re- .spectively.
  • At the output of the diode stages there are disposed resistance-capacitance circuits 30 and 3
  • thecarrier voltage applied to the grids of tubes 22 and 23 has to be exactly in phase with the two modulated high frequency pulsations. Because the obtaining of a strictly circular scanning on the indicator is dependent on the perfect phase setting of the high frequency of the two channels. A deviation of 5, for example, gives a curve that is very different from a circle, and in practice the tolerance is about half a degree.
  • the amplitude of the modulated high frequency is not critical. It the two sinusoids are slightly different, this difference is easily taken up in the amplifier that has to energize the deflection circuits of the oscillograph. It is sufiicient for the obtained modulation to be always less than, or at most equal to, By the addition of the carrier wave to the modulated wave there is thus produced a wave of the form:
  • one of the features of the present invention provides for disposing the adjustable phase shifting network on the carrier channel, e. g. as shown at 32, 33 and 34.
  • variable resistance 32 has a zero value
  • capacitance 33 is in parallel with resistance 34.
  • resistance 32 has its maximum value
  • the capacitance in parallel with resistance 34 is then minimum. Since the coupling inductance I3 is common to the two branches of the phase shifting circuit, adjustment of resistance 32 acts surely and effectively on the relative phase of the two channels.
  • the diagram of Fig. 5 furnishes an example of embodiment of a link circuit between detector tube 26 and the reversed finders rotor I8 that complies with these conditions.
  • another feature of the invention provides for applying the arch-shaped voltage obtained at the output of receiver 20 to the input of the reversed finders rotor [8. This condition is indispensable in the above described example for effecting on the screen of the oscillograph the transformation of the circular image into a tapered 8-shaped image, as shown in Fig. 6.
  • a phase comparison system for comparing the phase of a locally generated wave with the phase of an applied signal, comprising a high frequency generator, 2. generator having a rotary field coil and two orthogonal stator coils, a coupling circuit for coupling said high frequency generator to said field coil, means for applying said signal to said field coil, a pair of electron discharge tubes coupled respectively to said stator coils to derive therefrom output waveshaving a ninety degree phase relation and amplitude patterns dependent upon the phase of said applied signal and the envelope wave locally'generated in said generator, and means for supplying energy from said high frequency generator to said electron discharge tubes to provide substantially sinusoidal variations to said out-put waves.
  • said coupling circuit comprises an electron. discharge device provided with a primary tuned to said high frequency, and a secondary loosely coupled to said primary and conected to said field coil.
  • a system according to claim 1 further comprising a phase adjusting network in said last named means to adjust the phase -of the high frequency energy supplied thereby relative to the high frequency components applied from said stator coils.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Particle Accelerators (AREA)
US737660A 1944-04-27 1947-03-27 System for comparison of phase shift of electric quantities Expired - Lifetime US2462058A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2462058X 1944-04-27

Publications (1)

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US2462058A true US2462058A (en) 1949-02-15

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US737660A Expired - Lifetime US2462058A (en) 1944-04-27 1947-03-27 System for comparison of phase shift of electric quantities

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US (1) US2462058A (enrdf_load_stackoverflow)
FR (1) FR963157A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170243692A1 (en) * 2016-02-24 2017-08-24 The Boeing Company Quad-t transformer to convert ac single-phase to three-phase power

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170243692A1 (en) * 2016-02-24 2017-08-24 The Boeing Company Quad-t transformer to convert ac single-phase to three-phase power
US10199952B2 (en) * 2016-02-24 2019-02-05 The Boeing Company Quad-T transformer to convert AC single-phase to three-phase power

Also Published As

Publication number Publication date
FR963157A (enrdf_load_stackoverflow) 1950-06-30

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