JPS5577238A - Automatic frequency tracking unit - Google Patents

Automatic frequency tracking unit

Info

Publication number
JPS5577238A
JPS5577238A JP15339678A JP15339678A JPS5577238A JP S5577238 A JPS5577238 A JP S5577238A JP 15339678 A JP15339678 A JP 15339678A JP 15339678 A JP15339678 A JP 15339678A JP S5577238 A JPS5577238 A JP S5577238A
Authority
JP
Japan
Prior art keywords
frequency
signal
output
converter
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.)
Pending
Application number
JP15339678A
Other languages
Japanese (ja)
Inventor
Shuichi Ooka
Kiyohide Kitagawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP15339678A priority Critical patent/JPS5577238A/en
Publication of JPS5577238A publication Critical patent/JPS5577238A/en
Pending 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

Landscapes

  • Radar Systems Or Details Thereof (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To stabilize frequency control over a local oscillator by using an automatic frequency tracking unit, which controls an oscillation frequency by a digital signal, as a circuit exercising automatic control over a local oscillation frequency used for a radar unit. CONSTITUTION:An output from AFC mixer 3 of a radar unit is applied to frequency discriminator 4 to develop a voltage in proportion to a shift of an intermediate frequency from the frequency of a difference between the frequency of local oscillator 6 and a transmitted signal, and this voltage is applied to loop filter 5, whose output is converted into a digital signal by A/D converter 10. A signal of a difference in frequency between the transmitted output of mixer 3 and oscillator 6 is supplied to comparator 12 by way of filter 11 taking the intermediate frequency as a center frequency and comparator 12 compares the input signal with a fixed reference value; when the value is more than a fixed value, a signal is sent to gate circuit 13 to stop converter 10 from being applied with a conversion start command, and the oscillation frequency of oscillator 6 is controlled by a signal obtained by digitizing the output of converter 10.
JP15339678A 1978-12-06 1978-12-06 Automatic frequency tracking unit Pending JPS5577238A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15339678A JPS5577238A (en) 1978-12-06 1978-12-06 Automatic frequency tracking unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15339678A JPS5577238A (en) 1978-12-06 1978-12-06 Automatic frequency tracking unit

Publications (1)

Publication Number Publication Date
JPS5577238A true JPS5577238A (en) 1980-06-10

Family

ID=15561571

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15339678A Pending JPS5577238A (en) 1978-12-06 1978-12-06 Automatic frequency tracking unit

Country Status (1)

Country Link
JP (1) JPS5577238A (en)

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