GB1323278A - Antenna commutating arrangements - Google Patents

Antenna commutating arrangements

Info

Publication number
GB1323278A
GB1323278A GB1837072A GB1837072A GB1323278A GB 1323278 A GB1323278 A GB 1323278A GB 1837072 A GB1837072 A GB 1837072A GB 1837072 A GB1837072 A GB 1837072A GB 1323278 A GB1323278 A GB 1323278A
Authority
GB
United Kingdom
Prior art keywords
elements
distributer
circle
switch
power
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
GB1837072A
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
Publication of GB1323278A publication Critical patent/GB1323278A/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
    • G01S1/38—Systems for determining direction or position line using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna
    • G01S1/40—Systems for determining direction or position line using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna the apparent movement of the antenna being produced by cyclic sequential energisation of fixed antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H01Q3/242—Circumferential scanning

Landscapes

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

Abstract

1323278 Radio navigation; aerials MARCONI CO Ltd 20 April 1972 [20 April 1971] 18370/72 Headings H4A and H4D An aerial commutating arrangement such as is used for a Doppler V.H.F. omni-range system, and in which the movement of an aerial around a circle is simulated by sequentially activating the fixed elements of a circular array, features the division of the elements into two groups each occupying a semi-circle, and each having a respective group distributer, to which the elements are connected via individual switches, and to which either upper or low side-band R.F. power is fed via a changeover switch. As described a circular array comprises 48 elements. The odd-numbered elements 1, 3, 5, ... 23 occupying one semi-circle are connected via switches to a group distributer 51, which is also connected to a changeover switch 53. The odd-numbered elements 25, 27, 29, ... 47 occupying the other semi-circle are connected via switches to a group distributer 52, which is also connected to the changeover switch 53. A switch is also provided for each element so that it may be earthed when not in use, to prevent interaction with radiating elements. In the Figure, the switch 53 is positioned to supply LSB power to the distributer 51 and USB power to the distributer 52. The element 3 is connected to the distributer 51 and the diametrically opposite element 27 is connected to the distributer 52, all other elements being earthed. Sequential switching takes place so that the simulated rotation takes place in onethirtieth of a second, the next pair of odd elements to be activated being nos. 5 and 29, when nos. 3 and 27 are disconnected from the distributers, and are earthed. When the elements 25 and 1 are to be activated, following the elements 23 and 47, the switch 23 changes over, so that USB power is supplied to the distributer 51, and LSB power is supplied to the distributer 52. The element 1 may lie substantially in the direction of magnetic north with respect to the centre of the array. A similar arrangement is provided for the evennumbered elements of the array, but in order more closely to simulate the rotation of a radiating aerial at constant speed and to reduce amplitude modulation caused by the switching operation, bursts of energy from adjacent elements are arranged to overlap in time by half the burst period. That is, sideband energy is switched directly between consecutive oddnumbered elements (1, 3, 5,...) and is concurrently, but displaced in phase by half a burst period, switched between consecutive even-numbered elements (2, 4, 6 ...).
GB1837072A 1971-04-20 1972-04-20 Antenna commutating arrangements Expired GB1323278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU465371 1971-04-20

Publications (1)

Publication Number Publication Date
GB1323278A true GB1323278A (en) 1973-07-11

Family

ID=3695118

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1837072A Expired GB1323278A (en) 1971-04-20 1972-04-20 Antenna commutating arrangements

Country Status (1)

Country Link
GB (1) GB1323278A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2204810A1 (en) * 1972-10-26 1974-05-24 Int Standard Electric Corp
DE2503850A1 (en) * 1974-02-07 1975-08-14 Int Standard Electric Corp WAVE CONDUCTOR ANTENNA WITH APERTURE SWITCH
FR2602339A1 (en) * 1986-08-04 1988-02-05 Rockwell Collins France METHOD AND APPARATUS FOR RADIOGONIOMETRY WITH FREQUENCY MODULATION BY DOPPLER EFFECT

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2204810A1 (en) * 1972-10-26 1974-05-24 Int Standard Electric Corp
DE2503850A1 (en) * 1974-02-07 1975-08-14 Int Standard Electric Corp WAVE CONDUCTOR ANTENNA WITH APERTURE SWITCH
FR2602339A1 (en) * 1986-08-04 1988-02-05 Rockwell Collins France METHOD AND APPARATUS FOR RADIOGONIOMETRY WITH FREQUENCY MODULATION BY DOPPLER EFFECT
EP0258072A1 (en) * 1986-08-04 1988-03-02 ROCKWELL-COLLINS FRANCE (Société Anonyme) Direction finding method and device using doppler frequency modulation
US4954835A (en) * 1986-08-04 1990-09-04 Rockwell-Collins France Radiodirection finding method and apparatus using doppler effect frequency modulation

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee