GB640710A - Improvements in or relating to radio direction finders - Google Patents

Improvements in or relating to radio direction finders

Info

Publication number
GB640710A
GB640710A GB821647A GB821647A GB640710A GB 640710 A GB640710 A GB 640710A GB 821647 A GB821647 A GB 821647A GB 821647 A GB821647 A GB 821647A GB 640710 A GB640710 A GB 640710A
Authority
GB
United Kingdom
Prior art keywords
arrays
phase
switching
aerials
aperture
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
GB821647A
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB821647A priority Critical patent/GB640710A/en
Publication of GB640710A publication Critical patent/GB640710A/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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/52—Systems for determining direction or deviation from predetermined direction using a receiving antenna moving, or appearing to move, in a cyclic path to produce a Doppler variation of frequency of the received signal
    • G01S3/54—Systems for determining direction or deviation from predetermined direction using a receiving antenna moving, or appearing to move, in a cyclic path to produce a Doppler variation of frequency of the received signal the apparent movement of the antenna being produced by coupling the receiver cyclically and sequentially to each of several fixed spaced antennas
    • 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

640,710. Radio direction-finders. STANDARD TELEPHONES & CABLES, Ltd. March 26, 1947, No. 8216. Addition to 635,277. [Class 40 (vii)] In a radio direction-finder of the kind described in the parent Specification, the number of aerials in the two perpendicular arrays is made different, whereby it may be arranged that the phase-jumps occurring in the phase-modulated received signals never occur simultaneously for the two arrays. In the parent case, owing to the different frequencies F 1 , F 2 of the switching cycles and the equal number of aerials in the two arrays, the switching operations in the two arrays occasionally occurred simultaneously and in order to maintain the consequent phase-jumps within such limits that the distortion introduced by the non-linearity of the phase-discriminator would have a negligible effect upon the bearing indicator, the aperture of the array was not allowed to exceed 0.71 of the minimum operating wavelength. In the present system the arrays 1, 2, 3, 4 and A, B, C, D, E comprise four and five aerials respectively-and are produced by the projection on to the lines 5 and 6 of the apices of a regular octagon and a regular decagon respectively. The number of commutation intervals per complete switching cycle for the two arrays is consequently eight and ten respectively. The switching frequencies are arranged to be 500 c/s. and 400 c/s. respectively so that in both arrays an interval of 250 microseconds occurs between successive switching operations. The two sets of switching operations are caused to be displaced from one another by 125 microseconds so that switching never occurs simultaneously in the two arrays. On this account the aperture of the arrays may be increased over that in the parent Specification without the phase-jumps in the signal applied to the phase-discriminator being such as to introduce a bearing error. In the case described the aperture of the arrays is increased to one wavelength at the highest operating frequency. Specifications 590,260, [Group XXXVI], 594,530 and 596,699, are referred to.
GB821647A 1947-03-26 1947-03-26 Improvements in or relating to radio direction finders Expired GB640710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB821647A GB640710A (en) 1947-03-26 1947-03-26 Improvements in or relating to radio direction finders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB821647A GB640710A (en) 1947-03-26 1947-03-26 Improvements in or relating to radio direction finders

Publications (1)

Publication Number Publication Date
GB640710A true GB640710A (en) 1950-07-26

Family

ID=9848143

Family Applications (1)

Application Number Title Priority Date Filing Date
GB821647A Expired GB640710A (en) 1947-03-26 1947-03-26 Improvements in or relating to radio direction finders

Country Status (1)

Country Link
GB (1) GB640710A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1056203B (en) * 1954-05-21 1959-04-30 Int Standard Electric Corp Radio direction finder with a number of antennas arranged in a circle
DE1192710B (en) * 1960-09-24 1965-05-13 Standard Elektrik Lorenz Ag Doppler radio beacon system for determining the direction on the receiving end
GB2124849A (en) * 1982-07-29 1984-02-22 David Arthur Tong Direction finding systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1056203B (en) * 1954-05-21 1959-04-30 Int Standard Electric Corp Radio direction finder with a number of antennas arranged in a circle
DE1192710B (en) * 1960-09-24 1965-05-13 Standard Elektrik Lorenz Ag Doppler radio beacon system for determining the direction on the receiving end
GB2124849A (en) * 1982-07-29 1984-02-22 David Arthur Tong Direction finding systems

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