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GB1511687A - Simplified doppler antenna system - Google Patents

Simplified doppler antenna system

Info

Publication number
GB1511687A
GB1511687A GB32974/75A GB3297475A GB1511687A GB 1511687 A GB1511687 A GB 1511687A GB 32974/75 A GB32974/75 A GB 32974/75A GB 3297475 A GB3297475 A GB 3297475A GB 1511687 A GB1511687 A GB 1511687A
Authority
GB
United Kingdom
Prior art keywords
region
frequency
feed
feeds
divider
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
GB32974/75A
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 Aerospace Inc
Original Assignee
Hazeltine Corp
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 Hazeltine Corp filed Critical Hazeltine Corp
Publication of GB1511687A publication Critical patent/GB1511687A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
    • H01Q19/08—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens for modifying the radiation pattern of a radiating horn in which it is located
    • 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
    • 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
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/007—Antennas or antenna systems providing at least two radiating patterns using two or more primary active elements in the focal region of a focusing device
    • 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
    • H01Q3/26—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 relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • 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
    • H01Q3/26—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 relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2658—Phased-array fed focussing structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)

Abstract

1511687 Radio navigation; aerials HAZELTINE CORP 7 Aug 1975 [5 Nov 1974] 32974/75 Headings H4D and H4A The antenna system as described in Specification 1,425,143 is modified for use in a Doppler coded pattern navigation system wherein the frequency in only a selected portion of the radiated region is varied, the frequency in the at least one remaining portion of the region being constant and indicative of the sense of angular displacement with respect to the selected region. In use, a receiver situated for example in one of two off-axis portions may determine its position relative to the centre selected portion of the region, and on entering the latter portion may then make fine measurement as to its position as described in the above referred to Specification. In Fig. 1, the signal from source 18 and power divider 20 is fed via phase shifters 22a to 22e to feed horns 14a to 14i, but phase shifter 22a feeds, via power divider 24a, feed horns 14a, 14b, 14c and phase shifter 22e feeds via divider 24b feed horns 14g, 14h, 14i, so that only that portion of the radiation pattern illuminated by feed horns 14c to 14g produces frequency variation across its angular extent (see also Fig. 3, not shown). In another embodiment Fig. 2, an alternative antenna unit comprises a sectorial horn antenna 28 comprising parallel plates 30 and 32, and focusing lens 34, fed via feed means 14a to 14g which may be dipoles or radiating probes. The signal from phase shifter 22d only is split in power divider 24 and fed to ports 14d to 14g, for use in, for example, a glide slope navigation system wherein the desired glide slope is relatively high or low and therefore at one end of the angular region which the antenna irradiates. Transfer switches (36a, 36b, 36c) (Fig. 5, not shown) may be included in the feed circuit at points 16a to 16g whereby the non-frequency varying signal from divider 24 may be switched to a different set of feeds and hence the selected frequency varying portion may be moved to a different angular part of the irradiated region.
GB32974/75A 1974-11-05 1975-08-07 Simplified doppler antenna system Expired GB1511687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US521118A US3914765A (en) 1974-11-05 1974-11-05 Simplified doppler antenna system

Publications (1)

Publication Number Publication Date
GB1511687A true GB1511687A (en) 1978-05-24

Family

ID=24075441

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32974/75A Expired GB1511687A (en) 1974-11-05 1975-08-07 Simplified doppler antenna system

Country Status (7)

Country Link
US (1) US3914765A (en)
JP (1) JPS5165860A (en)
CA (1) CA1029127A (en)
DE (1) DE2549384A1 (en)
FR (1) FR2290767A1 (en)
GB (1) GB1511687A (en)
NL (1) NL7512398A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2941563A1 (en) * 1978-10-13 1980-04-24 Sperry Rand Corp SEMICONDUCTOR ARRANGEMENT
US8284102B2 (en) 2007-01-19 2012-10-09 Plasma Antennas Limited Displaced feed parallel plate antenna

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045800A (en) * 1975-05-22 1977-08-30 Hughes Aircraft Company Phase steered subarray antenna
US4025921A (en) * 1975-11-19 1977-05-24 The United States Of America As Represented By The Secretary Of The Army Technique for obtaining wide bandwidth with optically fed array
US4100548A (en) * 1976-09-30 1978-07-11 The United States Of America As Represented By The Secretary Of The Department Of Transportation Bifocal pillbox antenna system
US4270129A (en) * 1979-01-30 1981-05-26 Sperry Corporation Apparatus and method for realizing preselected free space antenna patterns
US8866691B2 (en) 2007-04-20 2014-10-21 Skycross, Inc. Multimode antenna structure
US7688273B2 (en) 2007-04-20 2010-03-30 Skycross, Inc. Multimode antenna structure
US8344956B2 (en) * 2007-04-20 2013-01-01 Skycross, Inc. Methods for reducing near-field radiation and specific absorption rate (SAR) values in communications devices
EP2947716B8 (en) * 2014-05-23 2023-08-09 Progress Rail Signaling S.p.A. Radar obstacle detector for a railway crossing
JP6446331B2 (en) * 2015-06-08 2018-12-26 日立オートモティブシステムズ株式会社 Sensor with flat beam generating antenna

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3864679A (en) * 1973-04-03 1975-02-04 Hazeltine Corp Antenna system for radiating doppler coded pattern using multiple beam antenna

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2941563A1 (en) * 1978-10-13 1980-04-24 Sperry Rand Corp SEMICONDUCTOR ARRANGEMENT
US8284102B2 (en) 2007-01-19 2012-10-09 Plasma Antennas Limited Displaced feed parallel plate antenna

Also Published As

Publication number Publication date
JPS5165860A (en) 1976-06-07
DE2549384A1 (en) 1976-05-13
NL7512398A (en) 1976-05-07
US3914765A (en) 1975-10-21
CA1029127A (en) 1978-04-04
FR2290767A1 (en) 1976-06-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee