GB1515666A - Secondary radar systems - Google Patents

Secondary radar systems

Info

Publication number
GB1515666A
GB1515666A GB4207174A GB4207174A GB1515666A GB 1515666 A GB1515666 A GB 1515666A GB 4207174 A GB4207174 A GB 4207174A GB 4207174 A GB4207174 A GB 4207174A GB 1515666 A GB1515666 A GB 1515666A
Authority
GB
United Kingdom
Prior art keywords
aerial
phase
fed
output
power splitter
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
GB4207174A
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.)
Plessey Co Ltd
Original Assignee
Plessey 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB4207174A priority Critical patent/GB1515666A/en
Publication of GB1515666A publication Critical patent/GB1515666A/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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
    • G01S13/762—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted with special measures concerning the radiation pattern, e.g. S.L.S.

Abstract

1515666 Secondary radar; aerial couplings PLESSEY CO Ltd 15 Aug 1975 [27 Sept 1974] 42071/74 Headings H4A and H4D In a secondary radar system including two aerial radiator elements which are fed in phase when transmitting the interrogation signal mode spacing key, and in anti-phase when transmitting a side lobe suppression pulse (between the interrogation pulses), the necessary phase change is achieved by feeding one output from a power splitter fed from the transmitter to a two state phase shifter and then to one aerial, the other output of the power splitter being fed directly to the other aerial. Hybrid coupler 2 is arranged to act as a power splitter and output 7 is fed directly to the aerial system 8. The other output 6 is fed in series with hybrid coupler 9 to the aerial system 8. Hybrid coupler 9 acts as a switchable phase reverser. Outputs 12 and 13 are connected to respective PIN diodes 14 and 15, which, when biased on by switch driver circuit 16, a zero phase shift is introduced, and when switched off, a 180‹ phase shift is introduced in the associated R.F. channel, to produce the required SLS radiation pattern from the aerial system 8.
GB4207174A 1975-08-15 1975-08-15 Secondary radar systems Expired GB1515666A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4207174A GB1515666A (en) 1975-08-15 1975-08-15 Secondary radar systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4207174A GB1515666A (en) 1975-08-15 1975-08-15 Secondary radar systems

Publications (1)

Publication Number Publication Date
GB1515666A true GB1515666A (en) 1978-06-28

Family

ID=10422707

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4207174A Expired GB1515666A (en) 1975-08-15 1975-08-15 Secondary radar systems

Country Status (1)

Country Link
GB (1) GB1515666A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012918A1 (en) * 1978-12-20 1980-07-09 Siemens Aktiengesellschaft PIN diode high frequency switch for secondary radar interrogators and transponders
US4983976A (en) * 1988-06-17 1991-01-08 Omron Tateisi Electronics Co. Signal transmission system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012918A1 (en) * 1978-12-20 1980-07-09 Siemens Aktiengesellschaft PIN diode high frequency switch for secondary radar interrogators and transponders
US4983976A (en) * 1988-06-17 1991-01-08 Omron Tateisi Electronics Co. Signal transmission system and method

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930815