GB2004427A - An arrangement in radar equipment for frequency locking a local oscillator - Google Patents

An arrangement in radar equipment for frequency locking a local oscillator

Info

Publication number
GB2004427A
GB2004427A GB7835728A GB7835728A GB2004427A GB 2004427 A GB2004427 A GB 2004427A GB 7835728 A GB7835728 A GB 7835728A GB 7835728 A GB7835728 A GB 7835728A GB 2004427 A GB2004427 A GB 2004427A
Authority
GB
United Kingdom
Prior art keywords
signal
local oscillator
detector
frequency
output 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
GB7835728A
Other versions
GB2004427B (en
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB2004427A publication Critical patent/GB2004427A/en
Application granted granted Critical
Publication of GB2004427B publication Critical patent/GB2004427B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal
    • 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

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)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

An arrangement in radar equipment for locking the frequency of a controllable local oscillator includes a sweep generator (10) which supplies a periodic linear control voltage to the local oscillator (3), a microwave generator (1) which generates a transmitter signal, the generator and the local oscillator each being connected via a multiplier (2, 4) to a mixer (5) in order to provide an intermediate frequency signal of the equipment, and a phase-locked loop (6, 7, 8, 9) for locking the local oscillator signal to the transmitter signal. The arrangement further includes a first selective circuit (11) including a low-pass filter in order to give an output signal if the frequency of the signal obtained from the mixer lies within a certain low frequency range compared with the intermediate frequency, a second selective circuit (12) including a band-pass filter in order to give an output signal if the frequency of the signal obtained from the mixer assumes a value in a range about the intermediate frequency, a first and a second detector (13, 14) for detecting respectively the said output signals, and logic circuitry (16) connected to the first detector and to the second detector and to the sweep generator to provide a stop signal for the sweep generator during a time interval which corresponds to a period of the linear control voltage only if an output signal is obtained from the second detector after an output signal from the first detector is obtained. <IMAGE>
GB7835728A 1977-09-13 1978-09-06 Arrangement in radar equipment for frequency locking a local oscillator Expired GB2004427B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7710219A SE410660B (en) 1977-09-13 1977-09-13 DEVICE IN A RADAR SYSTEM FOR LOADING A CONTROLLABLE LOCAL SCILLATOR FOR A RELEASED FREQUENCY BAND

Publications (2)

Publication Number Publication Date
GB2004427A true GB2004427A (en) 1979-03-28
GB2004427B GB2004427B (en) 1982-01-13

Family

ID=20332241

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7835728A Expired GB2004427B (en) 1977-09-13 1978-09-06 Arrangement in radar equipment for frequency locking a local oscillator

Country Status (7)

Country Link
CH (1) CH632849A5 (en)
DE (1) DE2838254A1 (en)
FR (1) FR2402879A1 (en)
GB (1) GB2004427B (en)
IT (1) IT1098640B (en)
NL (1) NL189434C (en)
SE (1) SE410660B (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB973800A (en) * 1955-10-21 1964-10-28 Sperry Rand Corp Automatic frequency control systems
FR1288134A (en) * 1961-02-01 1962-03-24 Cie Ind Des Telephones Electronically controlled frequency scanning synthesizer
US3142022A (en) * 1961-06-07 1964-07-21 Gen Precision Inc Automatic frequency control and sweep circuit
FR1483745A (en) * 1965-12-08 1967-06-09 Cit Alcatel Universal frequency synthesizer
FR1494257A (en) * 1966-07-26 1967-09-08 Cit Alcatel Preset frequency synthesizer
CH474909A (en) * 1968-03-22 1969-06-30 Siemens Ag Albis Circuit arrangement for the automatic regulation of the frequency of an oscillator with respect to a reference frequency
CH474910A (en) * 1968-05-07 1969-06-30 Siemens Ag Albis Circuit arrangement for the automatic regulation of the frequency of an oscillator with respect to a reference frequency

Also Published As

Publication number Publication date
NL189434B (en) 1992-11-02
FR2402879B1 (en) 1983-10-28
IT1098640B (en) 1985-09-07
GB2004427B (en) 1982-01-13
DE2838254A1 (en) 1979-04-12
CH632849A5 (en) 1982-10-29
FR2402879A1 (en) 1979-04-06
DE2838254C2 (en) 1988-11-24
NL189434C (en) 1993-04-01
SE7710219L (en) 1979-03-14
IT7827615A0 (en) 1978-09-13
SE410660B (en) 1979-10-22
NL7808929A (en) 1979-03-15

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19980905