JPS5673369A - Phase comparison system of decca receiving device - Google Patents

Phase comparison system of decca receiving device

Info

Publication number
JPS5673369A
JPS5673369A JP15122979A JP15122979A JPS5673369A JP S5673369 A JPS5673369 A JP S5673369A JP 15122979 A JP15122979 A JP 15122979A JP 15122979 A JP15122979 A JP 15122979A JP S5673369 A JPS5673369 A JP S5673369A
Authority
JP
Japan
Prior art keywords
output
frequency
voltage control
phase
circuit
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
JP15122979A
Other languages
Japanese (ja)
Other versions
JPS5853870B2 (en
Inventor
Kazuo Tsukada
Yoshiharu Kanzaki
Yoshikazu Hori
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15122979A priority Critical patent/JPS5853870B2/en
Publication of JPS5673369A publication Critical patent/JPS5673369A/en
Publication of JPS5853870B2 publication Critical patent/JPS5853870B2/en
Expired 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
    • 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
    • G01S1/306—Analogous systems in which frequency-related signals (harmonics) are compared in phase, e.g. DECCA 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)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

PURPOSE:To raise the stabilization and to lower the cost by a method wherein it is constituted that a variable frequency active filter and a frequency dividing circuit are combined and the phase comparison is performed without multiplying a frequency. CONSTITUTION:Voltage control oscillators 22, 23 generate signals of a frequencies of mpF, nqF, respectively and are divided respectively through frequency dividing circuits 24, 25 by p, q and then, generate difference detection circuit 12 compares an output of the frequency divider 24 and an output mF of an intermediate frequency amplifier 10 and generates an output in accordance with a phase difference. The output signal of the circuit 12 passes through a LPF16 and enters the voltage control oscillator 22, thus, the output mpF of the oscillator 22 being in a same phase and synchronized with the intermediate frequency signal mF. In the same way, the voltage control oscillator 23 generates an output of a frequency of nqF which is in a same phase and synchronized with the output nF of an intermediate frequency amplifier 11. Next thereto, the phase difference detection circuit 20 generates an output in accordance with the phase difference between the output mpF of the voltage control oscillator 22 and the output nqF of the voltage control oscillator 23 and issues commands. With this constitution, a multiplification circuit is not used, as a result, a phase variation is extremely small, thus, raising a stability and making a cost cheap.
JP15122979A 1979-11-21 1979-11-21 Decca receiver phase comparison method Expired JPS5853870B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15122979A JPS5853870B2 (en) 1979-11-21 1979-11-21 Decca receiver phase comparison method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15122979A JPS5853870B2 (en) 1979-11-21 1979-11-21 Decca receiver phase comparison method

Publications (2)

Publication Number Publication Date
JPS5673369A true JPS5673369A (en) 1981-06-18
JPS5853870B2 JPS5853870B2 (en) 1983-12-01

Family

ID=15514060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15122979A Expired JPS5853870B2 (en) 1979-11-21 1979-11-21 Decca receiver phase comparison method

Country Status (1)

Country Link
JP (1) JPS5853870B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60252173A (en) * 1984-05-29 1985-12-12 Furukawa Mining Co Ltd Piston pump
JPS6170585U (en) * 1984-10-15 1986-05-14

Also Published As

Publication number Publication date
JPS5853870B2 (en) 1983-12-01

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