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GB1218731A - Generator which is frequency-modulated according to a predetermined law - Google Patents

Generator which is frequency-modulated according to a predetermined law

Info

Publication number
GB1218731A
GB1218731A GB1351463A GB1351463A GB1218731A GB 1218731 A GB1218731 A GB 1218731A GB 1351463 A GB1351463 A GB 1351463A GB 1351463 A GB1351463 A GB 1351463A GB 1218731 A GB1218731 A GB 1218731A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
signal
oscillators
oscillator
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
GB1351463A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1218731A publication Critical patent/GB1218731A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • 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
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
    • G01S13/28—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
    • G01S13/284—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses
    • G01S13/286—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses frequency shift keyed

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

1,218,731. Pulse radar. COMPAGNIE FRANCAISE THOMSON-HOUSTON. 4 April, 1963 [5 April, 1962], No. 13514/63. Heading H4D. A frequency modulated generator for radar systems in which the transmitted pulses are expanded and the received pulses are compressed comprises either a plurality of oscillators each keyed at a predetermined frequency or a single calibrated variable frequency oscillator, delivering at given time intervals components each at an instantaneous frequency and with such a phase angle that the combination of these components produces an output signal, the frequency of which is modulated according to the predetermined law, wherein said components feed a common utilization device one after the other at determined instants and for a given time duration and wherein furthermore a correction circuit is provided to compensate for the phasing errors which the frequency modulated signal in the utilization device may show with respect to the theoretical signal which it is desired to approximate. As shown, oscillators 01 . . . On are successively connected to a load circuit 2 by switches C1 . . . Cn, .the switches being controlled by a circuit 4 receiving beat signals by a circuit 5 from the oscillators two at a time in the order in which they succeed one another, the circuit 4 also receiving signals proportional to time by a line 6. In order that the signal may have no discontinuities the time during which each oscillator is switched to the circuit 2 is a whole number multiple of the inverse of the frequency of that oscillator. The correction circuit for phase errors submits the signal to a phase modulation in synchronism with the switching rate, this modulation having either parabolic or sinusoidal characteristics.
GB1351463A 1962-04-05 1963-04-04 Generator which is frequency-modulated according to a predetermined law Expired GB1218731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR893391 1962-04-05

Publications (1)

Publication Number Publication Date
GB1218731A true GB1218731A (en) 1971-01-13

Family

ID=8776127

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1351463A Expired GB1218731A (en) 1962-04-05 1963-04-04 Generator which is frequency-modulated according to a predetermined law

Country Status (3)

Country Link
DE (1) DE977823C (en)
FR (1) FR1602253A (en)
GB (1) GB1218731A (en)

Also Published As

Publication number Publication date
FR1602253A (en) 1970-11-02
DE977823C (en) 1971-02-11

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