GB536178A - Improvements in or relating to radio compasses and radio direction finding systems - Google Patents

Improvements in or relating to radio compasses and radio direction finding systems

Info

Publication number
GB536178A
GB536178A GB2931539A GB2931539A GB536178A GB 536178 A GB536178 A GB 536178A GB 2931539 A GB2931539 A GB 2931539A GB 2931539 A GB2931539 A GB 2931539A GB 536178 A GB536178 A GB 536178A
Authority
GB
United Kingdom
Prior art keywords
signals
amplifiers
radio
coil
fed
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
GB2931539A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE441653D priority Critical patent/BE441653A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2931539A priority patent/GB536178A/en
Priority to FR867846D priority patent/FR867846A/en
Publication of GB536178A publication Critical patent/GB536178A/en
Expired legal-status Critical Current

Links

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
    • 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
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/143—Systems for determining direction or deviation from predetermined direction by vectorial combination of signals derived from differently oriented antennae
    • 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
    • G01S3/14—Systems for determining direction or deviation from predetermined direction

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Amplifiers (AREA)

Abstract

536,178. Directive wireless systems. STANDARD TELEPHONES & CABLES, Ltd., EARP, C. W., and COLES, R. V. Nov. 3, 1939, No. 29315. [Class 40 (v)] Relates to a radio-compass of the kind described in Specification 490,940 where the signals received from a pair of crossed frame aerials are each separately modulated before being combined on a common amplifier and fed to an indicator. According to the invention the input to and output from the modulators are periodically changed-over by a switch. As shown in Fig. 1, signals from a North-South aerial N, S, are applied to push-pull amplifiers M<SP>1</SP>, M<SP>2</SP> together with a lowfrequency modulating-frequency O<SP>1</SP>. Similarly signals from an East-West aerial E, W, are applied to the amplifiers. M<SP>3</SP>, M<SP>4</SP> together with a modulating-frequency from O<SP>2</SP>. The modulated outputs are combined through a phasing valve PV with the signals from a non-directive aerial V. One part of the resulting signals is fed to a pair of phones OP. The other part is applied to the search-coil S of a dynamometer (or to the deflecting coils of a cathode ray tube) the field-coils being fed with currents from the modulators O<SP>1</SP>, O<SP>2</SP> respectively. To detect any unbalance in the circuits, the coil NS is switched over to the amplifiers M<SP>3</SP>, M<SP>4</SP> and the coil WE to the amplifiers M<SP>1</SP>, M<SP>2</SP>, and the connections to the field coils CN, CS, CW, CE, are simultaneously reversed. The mean reading of the two indicators then gives the correct bearing. If quadrantal error is present, it can be compensated by modifying the relative effectiveness of the field coils, for instance by means of a variable shunt resistance.
GB2931539A 1939-11-03 1939-11-03 Improvements in or relating to radio compasses and radio direction finding systems Expired GB536178A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE441653D BE441653A (en) 1939-11-03
GB2931539A GB536178A (en) 1939-11-03 1939-11-03 Improvements in or relating to radio compasses and radio direction finding systems
FR867846D FR867846A (en) 1939-11-03 1940-11-29 Electrical signal comparison circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2931539A GB536178A (en) 1939-11-03 1939-11-03 Improvements in or relating to radio compasses and radio direction finding systems

Publications (1)

Publication Number Publication Date
GB536178A true GB536178A (en) 1941-05-06

Family

ID=10289592

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2931539A Expired GB536178A (en) 1939-11-03 1939-11-03 Improvements in or relating to radio compasses and radio direction finding systems

Country Status (3)

Country Link
BE (1) BE441653A (en)
FR (1) FR867846A (en)
GB (1) GB536178A (en)

Also Published As

Publication number Publication date
FR867846A (en) 1941-11-29
BE441653A (en)

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