GB1056179A - Radio navigation system - Google Patents

Radio navigation system

Info

Publication number
GB1056179A
GB1056179A GB4341063A GB4341063A GB1056179A GB 1056179 A GB1056179 A GB 1056179A GB 4341063 A GB4341063 A GB 4341063A GB 4341063 A GB4341063 A GB 4341063A GB 1056179 A GB1056179 A GB 1056179A
Authority
GB
United Kingdom
Prior art keywords
phase
station
output
signals
mobile 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
GB4341063A
Inventor
Charles William Earp
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority to DENDAT1252277D priority Critical patent/DE1252277B/de
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4341063A priority patent/GB1056179A/en
Priority to US385668A priority patent/US3340533A/en
Priority to BE651936D priority patent/BE651936A/xx
Priority to FR985550A priority patent/FR1409530A/en
Priority to US401440A priority patent/US3339202A/en
Publication of GB1056179A publication Critical patent/GB1056179A/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
    • 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
    • G01S1/304—Analogous systems in which a beat frequency, obtained by heterodyning the signals, is compared in phase with a reference signal obtained by heterodyning the signals in a fixed reference point and transmitted therefrom, e.g. LORAC (long range accuracy) or TORAN systems
    • 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
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009—Transmission of position information to remote stations

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

1,056,179. Radio navigation systems. STANDARD TELEPHONES & CABLES Ltd. Oct. 30, 1964 [Nov. 4, 1963], No. 43410/63. Heading H4D. A radio-navigation system comprises a plurality of fixed stations, each radiating a pair of sidebands of a carrier suppressed transmission, the modulation frequencies being different for each station and the suppressed carriers being phase interlocked, and a mobile station, receiving the pairs of sidebands and generating the suppressed carrier by local means whereby the pairs of aide bands may be demodulated to produce corresponding pairs of modulation signals, the phase difference between the signals of any pair of modulation signals representing the distance of the mobile station to the corresponding fixed station. Each fixed station 1 or 2, Fig. 1, comprises a carrier signal generator 5 or 7 and a modulation signal generator 6 or 9 feeding a balanced modulator 4 or 10 to produce the pairs of sidebands. The carrier signal generators which may operate at 20,000 c/s. are accurately phase locked, and the modulation frequencies of the two stations are different, for example 15 c/s. and 25 c/s. The mobile station 3 comprises an aerial 12 for receiving the pairs of sidebands and feeding them via pre detector stages 13 to a demodulator 14. The demodulator is also supplied with a signal at the carrier frequency from generator 15. The generator is highly stable and the signal remains substantially locked to the suppressed carrier signals. The modulation products of the upper sidebands appear at one output of the demodulator, and the modulation products of the lower sidebands appear at the other output. The modulation signals at 15 c/s. are separated out by filters 16 and 17 and the phase difference therebetween determined by phase measurer 20. This phase difference represents the distance from the mobile station to fixed station 1. Similarly the output of phase measurer 22, working on the signals at frequency 25 c/s., represents the distance from the mobile station to fixed station 2. The outputs of the phase measurers may be in the form of rotations of shafts 21 and 23. whereby, by coupling these shafts to a differential gear assembly 24, the gear assembly will give an output representing the difference in the distances of the two fixed stations which output can be used in a hyperbolic lattice navigation system. If a third fixed station is provided, a second hyperbolic lattice may be used enabling a fix to be made of the mobile station's position. In a second embodiment, Fig. 3 (not shown). three fixed stations are used having modulation frequencies of f 1 , f 2 and f 3 . The modulatoin signals at frequency f 3 in the output of the demodulator are fed to a phase-sensitive detector 28, the output signal of which is used to control a phase shifter in the path of the carrier signals from generator 15 to demodulator 14. A predetermined phase relationship is thus set up between the carrier signal and the sideband signals giving frequency f 3 . The output of phase measurer 20, thus represents the difference in the distance of the mobile station from station I and the third station, and the output of phase measurer 22 represents the difference in the distances of the mobile station from station 2 and the third station.
GB4341063A 1963-08-19 1963-11-04 Radio navigation system Expired GB1056179A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DENDAT1252277D DE1252277B (en) 1963-08-19
GB4341063A GB1056179A (en) 1963-11-04 1963-11-04 Radio navigation system
US385668A US3340533A (en) 1963-08-19 1964-07-28 Radio direction finding system
BE651936D BE651936A (en) 1963-08-19 1964-08-18
FR985550A FR1409530A (en) 1963-08-19 1964-08-19 Phase difference signal transmission system, especially for air navigation
US401440A US3339202A (en) 1963-08-19 1964-10-05 Radiolocation system transmitting sideband signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4341063A GB1056179A (en) 1963-11-04 1963-11-04 Radio navigation system

Publications (1)

Publication Number Publication Date
GB1056179A true GB1056179A (en) 1967-01-25

Family

ID=10428634

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4341063A Expired GB1056179A (en) 1963-08-19 1963-11-04 Radio navigation system

Country Status (1)

Country Link
GB (1) GB1056179A (en)

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