FR2424543A1 - Detecting moving radar target from fixed echoes - utilising variable frequency coherent oscillator frequency controlled from auto-oscillator - Google Patents

Detecting moving radar target from fixed echoes - utilising variable frequency coherent oscillator frequency controlled from auto-oscillator

Info

Publication number
FR2424543A1
FR2424543A1 FR7812124A FR7812124A FR2424543A1 FR 2424543 A1 FR2424543 A1 FR 2424543A1 FR 7812124 A FR7812124 A FR 7812124A FR 7812124 A FR7812124 A FR 7812124A FR 2424543 A1 FR2424543 A1 FR 2424543A1
Authority
FR
France
Prior art keywords
oscillator
auto
coherent
frequency
signal
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.)
Granted
Application number
FR7812124A
Other languages
French (fr)
Other versions
FR2424543B1 (en
Inventor
Francois Albert Noel Le Ray
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.)
Laboratoire Central de Telecommunications SA
Original Assignee
Laboratoire Central de Telecommunications 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 Laboratoire Central de Telecommunications SA filed Critical Laboratoire Central de Telecommunications SA
Priority to FR7812124A priority Critical patent/FR2424543A1/en
Priority to DE19792915564 priority patent/DE2915564A1/en
Priority to BE2/57748A priority patent/BE875828A/en
Publication of FR2424543A1 publication Critical patent/FR2424543A1/en
Application granted granted Critical
Publication of FR2424543B1 publication Critical patent/FR2424543B1/fr
Granted 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/288—Coherent receivers

Landscapes

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

Abstract

The coherent radar permits detection of moving target from amongst fixed objects utilising Doppler effects. The coherent oscillator is controlled from auto oscillator to vary intermediate frequency (IF) to provide frequency and phase control. The auto oscillator output is mixed with output from stabilised local oscillator to provide IF signal. This is applied to a variable frequency coherent oscillator to produce an output for phase demodulation of the IF signal. A second phase demodulator provides quadrature phase signal and both signals are used to derive frequency control signal for coherent oscillator and applied via varactor diode.
FR7812124A 1978-04-25 1978-04-25 Detecting moving radar target from fixed echoes - utilising variable frequency coherent oscillator frequency controlled from auto-oscillator Granted FR2424543A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7812124A FR2424543A1 (en) 1978-04-25 1978-04-25 Detecting moving radar target from fixed echoes - utilising variable frequency coherent oscillator frequency controlled from auto-oscillator
DE19792915564 DE2915564A1 (en) 1978-04-25 1979-04-18 COHERENT RADAR
BE2/57748A BE875828A (en) 1978-04-25 1979-04-25 VARIABLE INTERMEDIATE FREQUENCY COHERENT RADAR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7812124A FR2424543A1 (en) 1978-04-25 1978-04-25 Detecting moving radar target from fixed echoes - utilising variable frequency coherent oscillator frequency controlled from auto-oscillator

Publications (2)

Publication Number Publication Date
FR2424543A1 true FR2424543A1 (en) 1979-11-23
FR2424543B1 FR2424543B1 (en) 1984-02-17

Family

ID=9207530

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7812124A Granted FR2424543A1 (en) 1978-04-25 1978-04-25 Detecting moving radar target from fixed echoes - utilising variable frequency coherent oscillator frequency controlled from auto-oscillator

Country Status (3)

Country Link
BE (1) BE875828A (en)
DE (1) DE2915564A1 (en)
FR (1) FR2424543A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594263A (en) * 1948-01-21 1952-04-22 Philco Corp Automatic frequency control system
GB1026070A (en) * 1964-03-09 1966-04-14 Siemens Ag Albis Improvements in or relating to superheterodyne receivers
US3852682A (en) * 1972-06-22 1974-12-03 Marconi Instruments Ltd Oscillation generators
US4009448A (en) * 1976-01-06 1977-02-22 Westinghouse Electric Corporation Phase lock loop for a voltage controlled oscillator
US4040055A (en) * 1974-07-15 1977-08-02 International Telephone And Telegraph Corporation Digital compensator for transmitter instability

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594263A (en) * 1948-01-21 1952-04-22 Philco Corp Automatic frequency control system
GB1026070A (en) * 1964-03-09 1966-04-14 Siemens Ag Albis Improvements in or relating to superheterodyne receivers
US3852682A (en) * 1972-06-22 1974-12-03 Marconi Instruments Ltd Oscillation generators
US4040055A (en) * 1974-07-15 1977-08-02 International Telephone And Telegraph Corporation Digital compensator for transmitter instability
US4009448A (en) * 1976-01-06 1977-02-22 Westinghouse Electric Corporation Phase lock loop for a voltage controlled oscillator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/75 *

Also Published As

Publication number Publication date
BE875828A (en) 1979-10-25
DE2915564A1 (en) 1979-11-08
FR2424543B1 (en) 1984-02-17

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Legal Events

Date Code Title Description
CA Change of address
TP Transmission of property
ST Notification of lapse