GB721309A - Improvements in or relating to frequency sensitive arrangements - Google Patents

Improvements in or relating to frequency sensitive arrangements

Info

Publication number
GB721309A
GB721309A GB1037652A GB1037652A GB721309A GB 721309 A GB721309 A GB 721309A GB 1037652 A GB1037652 A GB 1037652A GB 1037652 A GB1037652 A GB 1037652A GB 721309 A GB721309 A GB 721309A
Authority
GB
United Kingdom
Prior art keywords
frequency
specimen
field
coil
uniform
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
GB1037652A
Inventor
Christopher Dering Colchester
George David Speake
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB1037652A priority Critical patent/GB721309A/en
Publication of GB721309A publication Critical patent/GB721309A/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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
    • G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
    • G01S13/53—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi performing filtering on a single spectral line and associated with one or more range gates with a phase detector or a frequency mixer to extract the Doppler information, e.g. pulse Doppler radar
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
    • G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/24—Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

721,309. Radar; frequency discrimination. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 18, 1953 [April 24, 1952], No. 10376/52. Classes 40 (5) and 40 (7). A frequency discriminator comprises a nuclear resonance coupling system. The output from a radar receiver 2 at its intermediate frequency is fed to a coil 3 to produce a high-frequency magnetic field HI in the X direction in a specimen 4 of high' nuclear gyromagnetic ratio. A non-uniform magnetic field HO constant with time threads the specimen in the Z direction. Outputs thus produced in coils 5, 6, having axes in the Y direction are opposed so that echoes from fixed targets are eliminated by prior adjustment of the strength of the field HO, but moving targets produce an output signal at 7 due to Doppler frequency shift. The coils may be side-byside with the field HO non-uniform about the plane P separating them or on a common former on opposite sides of the specimen, with the field HO non-uniform about the axis of the coil 3, Figure (not shown), accompanying the Complete Specification. A nuclear resonance coupling device may be used to provide accurate frequency control by automatic regulation of the input to the coil 3. Water is a suitable substance for specimen 4 because of its hydrogen content.
GB1037652A 1952-04-24 1952-04-24 Improvements in or relating to frequency sensitive arrangements Expired GB721309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1037652A GB721309A (en) 1952-04-24 1952-04-24 Improvements in or relating to frequency sensitive arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1037652A GB721309A (en) 1952-04-24 1952-04-24 Improvements in or relating to frequency sensitive arrangements

Publications (1)

Publication Number Publication Date
GB721309A true GB721309A (en) 1955-01-05

Family

ID=9966706

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1037652A Expired GB721309A (en) 1952-04-24 1952-04-24 Improvements in or relating to frequency sensitive arrangements

Country Status (1)

Country Link
GB (1) GB721309A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915714A (en) * 1955-05-05 1959-12-01 Marconi Wireless Telegraph Co Frequency and phase shifters and modulators for very high frequency electro-magneticwaves
US2948868A (en) * 1955-11-14 1960-08-09 Bell Telephone Labor Inc Frequency sensitive electromagnetic wave device
US3095546A (en) * 1956-03-01 1963-06-25 Sylvania Electric Prod Gyromagnetic isolator using a nonuniform magnetic bias
US4575695A (en) * 1982-12-03 1986-03-11 Raytheon Company Method and apparatus for orientating ferrimagnetic bodies

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915714A (en) * 1955-05-05 1959-12-01 Marconi Wireless Telegraph Co Frequency and phase shifters and modulators for very high frequency electro-magneticwaves
US2948868A (en) * 1955-11-14 1960-08-09 Bell Telephone Labor Inc Frequency sensitive electromagnetic wave device
US3095546A (en) * 1956-03-01 1963-06-25 Sylvania Electric Prod Gyromagnetic isolator using a nonuniform magnetic bias
US4575695A (en) * 1982-12-03 1986-03-11 Raytheon Company Method and apparatus for orientating ferrimagnetic bodies

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