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GB1086733A - Improvements in or relating to phase comparison radio navigation systems - Google Patents

Improvements in or relating to phase comparison radio navigation systems

Info

Publication number
GB1086733A
GB1086733A GB3035364A GB3035364A GB1086733A GB 1086733 A GB1086733 A GB 1086733A GB 3035364 A GB3035364 A GB 3035364A GB 3035364 A GB3035364 A GB 3035364A GB 1086733 A GB1086733 A GB 1086733A
Authority
GB
United Kingdom
Prior art keywords
phase
frequency
output
transmission
master station
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.)
Expired
Application number
GB3035364A
Inventor
Graham Estyn Roberts
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.)
Decca Ltd
Original Assignee
Decca 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 Decca Ltd filed Critical Decca Ltd
Priority to GB3035364A priority Critical patent/GB1086733A/en
Priority to NO15909565A priority patent/NO119995B/no
Priority to SE1003765A priority patent/SE343951B/xx
Priority to ES0315965A priority patent/ES315965A1/en
Priority to DE1965D0047869 priority patent/DE1276761B/en
Publication of GB1086733A publication Critical patent/GB1086733A/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)
  • Press Drives And Press Lines (AREA)

Abstract

1,086,733. Radio navigation. DECCA Ltd. July 16, 1965 [July 31, 1964], No. 30353/64. Heading H4D. The invention relates to a receiver in a hyperbolic navigation system of the type disclosed in Specifications 765,573 and 949,480, wherein each station in turn produces a multi-frequency transmission during periodic interruption in the normal transmissions said receiver using only one received frequency, and comprising a tuned receiver stage 11, tuned in this embodiment to the frequency normally produced by the master station. The receiver also comprises a phasecontrolled oscillator 14 operating at said frequency and feeding its output to one input of a phase discriminator 13 having the output of the receiver stage 11 applied to its other input. During the normal transmissions, the signal from the master station is thus compared in phase with the output of the oscillator, and a signal equal to the sine of the phase difference is used to control the phase of the oscillator via closed relay contact 17, such that the oscillator output is phase locked to the normal master station transmission. Break detector 18 detects the break in transmission of a specific length occurring at the end of the normal transmission period, and the beginning of the multi-frequency transmission period, and actuates a relay, such that contact 17 opens, and contacts 21 and 22 close. The signal in the multifrequency transmission at said frequency is received in stage 11 and compared in phase with the output of oscillator 14, still locked to the master station normal transmission. The sine output of the phase discriminator together with a cosine output is fed via contacts 21 and 22 to a selector switch 24. The selector switch is controlled by a connector 28 which in turn is controlled by the break detector 18, such that the two outputs are fed to the one of three phase difference indicators allocated to the slave station giving the multi-frequency transmission. There are thus provided three differential phase indications based on three confocal hyperbolic isophase systems having foci at the master station and at the respective slave station and having lane widths corresponding to the normal frequency of the master station. To overcome phase ambiguities, each phase difference indicator may comprise a cycle integration counter or form part of an automatic chart position indicator.
GB3035364A 1964-07-31 1964-07-31 Improvements in or relating to phase comparison radio navigation systems Expired GB1086733A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB3035364A GB1086733A (en) 1964-07-31 1964-07-31 Improvements in or relating to phase comparison radio navigation systems
NO15909565A NO119995B (en) 1964-07-31 1965-07-26
SE1003765A SE343951B (en) 1964-07-31 1965-07-30
ES0315965A ES315965A1 (en) 1964-07-31 1965-07-30 Improvements in or relating to phase comparison radio navigation systems
DE1965D0047869 DE1276761B (en) 1964-07-31 1965-07-30 Receiving device for a hyperbola navigation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3035364A GB1086733A (en) 1964-07-31 1964-07-31 Improvements in or relating to phase comparison radio navigation systems

Publications (1)

Publication Number Publication Date
GB1086733A true GB1086733A (en) 1967-10-11

Family

ID=10306307

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3035364A Expired GB1086733A (en) 1964-07-31 1964-07-31 Improvements in or relating to phase comparison radio navigation systems

Country Status (5)

Country Link
DE (1) DE1276761B (en)
ES (1) ES315965A1 (en)
GB (1) GB1086733A (en)
NO (1) NO119995B (en)
SE (1) SE343951B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2261555A1 (en) * 1971-12-17 1973-06-28 Neo Tec Etude Applic Tech HYPERBELON LOCATION BY PHASE MEASUREMENT

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1308150A (en) * 1969-11-10 1973-02-21 Decca Ltd Receivers for phase comparison radio navigation systems

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US949480A (en) * 1909-07-12 1910-02-15 Edward S Hodgson Jr Dental nozzle.
NL75105C (en) * 1945-08-23
GB643381A (en) * 1947-06-06 1950-09-20 Decca Record Co Ltd Improvements in or relating to apparatus for determining the maintenance of or departure from a predetermined relationship between two variables
GB765573A (en) * 1954-03-08 1957-01-09 Decca Record Co Ltd Improvements in or relating to radio navigation systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2261555A1 (en) * 1971-12-17 1973-06-28 Neo Tec Etude Applic Tech HYPERBELON LOCATION BY PHASE MEASUREMENT

Also Published As

Publication number Publication date
SE343951B (en) 1972-03-20
ES315965A1 (en) 1965-12-01
NO119995B (en) 1970-08-10
DE1276761B (en) 1968-09-05

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