GB1215934A - Improvements in or relating to navigation aiding radio receivers - Google Patents

Improvements in or relating to navigation aiding radio receivers

Info

Publication number
GB1215934A
GB1215934A GB2758467A GB2758467A GB1215934A GB 1215934 A GB1215934 A GB 1215934A GB 2758467 A GB2758467 A GB 2758467A GB 2758467 A GB2758467 A GB 2758467A GB 1215934 A GB1215934 A GB 1215934A
Authority
GB
United Kingdom
Prior art keywords
fed
frequency
modulation frequencies
amplitudes
afford
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
GB2758467A
Inventor
Thomas Theodore Brow
Eamon Friel
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB2758467A priority Critical patent/GB1215934A/en
Publication of GB1215934A publication Critical patent/GB1215934A/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

Abstract

1,215,934. Radio navigation. MARCONI CO. Ltd. 20 March, 1968 [15 June, 1967], No. 27584/67. Heading H4D. [Also in Division G1] Relates to radio navigation receivers in which the amplitudes of two modulation frequencies (e.g. 90 c/s., 150 c/s.) on a common carrier frequency are compared to afford an indication of deviation from a course line. According to the invention the modulation frequencies are alternately heterodyned to the same resultant frequency and the resultant frequency is fed alternately and synchronously to rectifying means to give two output signals respectively proportional to the amplitudes of the two modulation frequencies. In one embodiment a local master oscillator 3 of frequency 180 c/s. is phaselocked to the 90 c/s. tone and logic circuit dividers 2, 4, 5 produce 90 e/s., 60 c/s., 7.5 c/s. outputs respectively, the 7.5 c/s. outputs being fed to AND gates 6, 7, 9, 10 to effect the requisite change-over switching; D1 and F are the usual course-deviation indicator and flag alarm respectively. Narrow-band filter 8 which follows balanced mixer M is preferably a "three-shift register" digital filter fed with a " clocking " 90 c/s. signal from divider 2 to afford a 2 c/s. bandwidth centred accurately on 30 c/s.: and any received 90 c/s. tone shift will be followed by the filter.
GB2758467A 1967-06-15 1967-06-15 Improvements in or relating to navigation aiding radio receivers Expired GB1215934A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2758467A GB1215934A (en) 1967-06-15 1967-06-15 Improvements in or relating to navigation aiding radio receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2758467A GB1215934A (en) 1967-06-15 1967-06-15 Improvements in or relating to navigation aiding radio receivers

Publications (1)

Publication Number Publication Date
GB1215934A true GB1215934A (en) 1970-12-16

Family

ID=10262022

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2758467A Expired GB1215934A (en) 1967-06-15 1967-06-15 Improvements in or relating to navigation aiding radio receivers

Country Status (1)

Country Link
GB (1) GB1215934A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2380881A (en) * 2001-10-10 2003-04-16 Roke Manor Research Estimating the angle of arrival at a mobile terminal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2380881A (en) * 2001-10-10 2003-04-16 Roke Manor Research Estimating the angle of arrival at a mobile terminal
GB2380881B (en) * 2001-10-10 2005-08-24 Roke Manor Research Method for estimating angle of arrival at a mobile terminal

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