GB892282A - Improvements in or relating to pulsed radar systems - Google Patents

Improvements in or relating to pulsed radar systems

Info

Publication number
GB892282A
GB892282A GB1069959A GB1069959A GB892282A GB 892282 A GB892282 A GB 892282A GB 1069959 A GB1069959 A GB 1069959A GB 1069959 A GB1069959 A GB 1069959A GB 892282 A GB892282 A GB 892282A
Authority
GB
United Kingdom
Prior art keywords
coherent
pulse
phased
oscillations
echo
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
GB1069959A
Inventor
Wilfrid Sinden Mortley
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB1069959A priority Critical patent/GB892282A/en
Publication of GB892282A publication Critical patent/GB892282A/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
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
    • G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
    • G01S13/526—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi performing filtering on the whole spectrum without loss of range information, e.g. using delay line cancellers or comb filters

Landscapes

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

Abstract

892,282. Pulse radar. MARCONI'S WIRELESS TELEGRAPH CO. Ltd. Oct. 5, 1959 [March 26, 1959], No. 10699/59. Class 40(7). An M.T.I. radar system which allows cancellation of fixed target echoes received after a delay greater than the interval between transmitted pulses includes a fixed target echo cancellation channel in which echo signals resulting from a transmitted pulse are mixed with coherent oscillations phased by the oscillations of that pulse and at least one other cancellation channel in which the echo signals are mixed with coherent oscillations phased by the preceding transmitted pulse, and the outputs from the two channels are combined for M.T.I. display. The Figure shows a system in which echo pulses are applied, after mixing to produce I.F. signals, to parallel coherent detectors CD, CD<SP>1</SP> each of which feeds a subtractive combining device SD or SD<SP>1</SP> through two paths one of which has a delay DL2 or DL2<SP>1</SP> equal to the transmitter pulse repetition time. The second inputs to CD and CD<SP>1</SP> are obtained from a coherent oscillator COHO phased by the transmitted pulses; CD is fed direct, CD<SP>1</SP> through a delay line DLI. The outputs from SD and SD<SP>1</SP> are fed to a coincidence detector AG, responsive to the smaller of two coincident inputs, which feeds a display unit Two coherent oscillators may be used, one for each channel.
GB1069959A 1959-03-26 1959-03-26 Improvements in or relating to pulsed radar systems Expired GB892282A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1069959A GB892282A (en) 1959-03-26 1959-03-26 Improvements in or relating to pulsed radar systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1069959A GB892282A (en) 1959-03-26 1959-03-26 Improvements in or relating to pulsed radar systems

Publications (1)

Publication Number Publication Date
GB892282A true GB892282A (en) 1962-03-21

Family

ID=9972663

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1069959A Expired GB892282A (en) 1959-03-26 1959-03-26 Improvements in or relating to pulsed radar systems

Country Status (1)

Country Link
GB (1) GB892282A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0106340A1 (en) * 1982-10-15 1984-04-25 SELENIA INDUSTRIE ELETTRONICHE ASSOCIATE S.p.A. Device for automatic cancelling of undesired radar echoes
WO1988000355A1 (en) * 1986-07-07 1988-01-14 Hughes Aircraft Company Multiple range interval clutter cancellation circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0106340A1 (en) * 1982-10-15 1984-04-25 SELENIA INDUSTRIE ELETTRONICHE ASSOCIATE S.p.A. Device for automatic cancelling of undesired radar echoes
WO1988000355A1 (en) * 1986-07-07 1988-01-14 Hughes Aircraft Company Multiple range interval clutter cancellation circuit

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