IE822671L - Local clock compensation device for use in a radionavigation¹device - Google Patents

Local clock compensation device for use in a radionavigation¹device

Info

Publication number
IE822671L
IE822671L IE822671A IE267182A IE822671L IE 822671 L IE822671 L IE 822671L IE 822671 A IE822671 A IE 822671A IE 267182 A IE267182 A IE 267182A IE 822671 L IE822671 L IE 822671L
Authority
IE
Ireland
Prior art keywords
frequency
transmission
sampling
local clock
transmitter
Prior art date
Application number
IE822671A
Other versions
IE53654B1 (en
Original Assignee
Thomson Csf
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 Thomson Csf filed Critical Thomson Csf
Publication of IE822671L publication Critical patent/IE822671L/en
Publication of IE53654B1 publication Critical patent/IE53654B1/en

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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08—Systems for determining direction or position line
    • G01S1/20—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems
    • G01S1/30—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems the synchronised signals being continuous waves or intermittent trains of continuous waves, the intermittency not being for the purpose of determining direction or position line and the transit times being compared by measuring the phase difference
    • G01S1/308—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems the synchronised signals being continuous waves or intermittent trains of continuous waves, the intermittency not being for the purpose of determining direction or position line and the transit times being compared by measuring the phase difference particularly adapted to Omega systems
    • 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
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Toys (AREA)
  • Communication Control (AREA)

Abstract

1. Compensation method for a local clock, consisting in : - by means of a reception circuit (2) at least one transmission (F0 , F1 of F2 ) is received in the form of a rectangular signal from at least one transmitter piloted by a high precision clock ; - by means of a synchronization circuit (4) an at least approximate synchronization with the rectangular transmission signals from the transmitter is produced ; - by means of a comparing circuit (1) said transmission is sampled with a sampling frequency (FE ) which is an integral divisor of the frequency (F) of the local clock (3) and a comparison between the frequency of the local clock and that of said transmission is deduced therefrom ; - by means of a correction circuit (5) the frequency of the local clock (3) is corrected as a function of the result of said comparison, the sampling frequency (FE ) being defined in this method by dividing that of the clock and being nominally equal to that of said transmission or to an integer divisor thereof, and wherein a plurality of transmissions of different frequency are received in the form of rectangular signals from at least one transmitter and wherein said sampling frequency (FE ) is an integer common divisor of said transmission frequencies (F0 , F1 , F2 ), characterized in that at the end of the sampling operation pulse couples (a0 , b0 ; a1 , b1 ; a2 , b2 ) are obtained the recurrence of which correspond to said sampling frequency (F) in order to produce a sampling (a0 , a1 , a2 ) and a quadrature sampling (b0 , b1 , b2 ) for a given frequency (F0 , F1 or F2 , respectively), and in that the time shift between said sampling frequency (FE ) and at least one frequency of at least one transmission (F0 , F1 or F2 ) is periodically calculated. [EP0079280A1]
IE2671/82A 1981-11-10 1982-11-09 Local clock compensation device, and a radionavigation device, particularly of the omega type, containing it IE53654B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8121092A FR2516249B1 (en) 1981-11-10 1981-11-10 LOCAL CLOCK COMPENSATION DEVICE AND RADIO-NAVIGATION DEVICE, ESPECIALLY OMEGA, INCLUDING THE SAME

Publications (2)

Publication Number Publication Date
IE822671L true IE822671L (en) 1983-05-10
IE53654B1 IE53654B1 (en) 1989-01-04

Family

ID=9263884

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2671/82A IE53654B1 (en) 1981-11-10 1982-11-09 Local clock compensation device, and a radionavigation device, particularly of the omega type, containing it

Country Status (6)

Country Link
EP (1) EP0079280B1 (en)
DE (1) DE3272606D1 (en)
DK (1) DK161265C (en)
FR (1) FR2516249B1 (en)
IE (1) IE53654B1 (en)
NO (1) NO158899C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563632B2 (en) * 1984-04-26 1986-08-14 Mlr Electronique RECEIVER FOR RECEIVING AND PROCESSING RADIOELECTRIC SIGNALS
DE3472841D1 (en) * 1983-05-30 1988-08-25 Mlr Electronique Method of processing radio-electrical signals for radio navigation, and receiver for carrying out the method
US5031230A (en) * 1988-10-24 1991-07-09 Simulcomm Partnership Frequency, phase and modulation control system which is especially useful in simulcast transmission systems

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840821A (en) * 1967-07-27 1974-10-08 Sperry Rand Corp Phase lock loop with sampling techniques for regenerating clock signal associated with data input signals
US3818477A (en) * 1969-12-31 1974-06-18 American Standard Inc Pulse-operated receiver
US3936828A (en) * 1972-12-22 1976-02-03 Communications Components Corporation VLF navigation system
GB1439850A (en) * 1973-09-19 1976-06-16 Univ North Wales Digital phse comparators
FR2255744A1 (en) * 1973-12-19 1975-07-18 Bosch Gmbh Robert Frequency locking system with controlled oscillator - first oscillator is sampled at second frequency to derive control voltage signal
US3936763A (en) * 1974-11-15 1976-02-03 The United States Of America As Represented By The Secretary Of The Navy Null input OMEGA tracking filter system

Also Published As

Publication number Publication date
IE53654B1 (en) 1989-01-04
EP0079280A1 (en) 1983-05-18
DK161265B (en) 1991-06-17
NO823737L (en) 1983-05-11
NO158899C (en) 1988-11-09
FR2516249B1 (en) 1985-09-06
DK496082A (en) 1983-05-11
FR2516249A1 (en) 1983-05-13
DK161265C (en) 1991-12-02
DE3272606D1 (en) 1986-09-18
EP0079280B1 (en) 1986-08-13
NO158899B (en) 1988-08-01

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Legal Events

Date Code Title Description
MM4A Patent lapsed