GB1150542A - Radar Receiver Employing a Synthetic Coherent Reference - Google Patents

Radar Receiver Employing a Synthetic Coherent Reference

Info

Publication number
GB1150542A
GB1150542A GB1784566A GB1784566A GB1150542A GB 1150542 A GB1150542 A GB 1150542A GB 1784566 A GB1784566 A GB 1784566A GB 1784566 A GB1784566 A GB 1784566A GB 1150542 A GB1150542 A GB 1150542A
Authority
GB
United Kingdom
Prior art keywords
radar
delay line
echo
energy
instance
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
GB1784566A
Inventor
Carl Atwood Wiley
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.)
North American Aviation Corp
Original Assignee
North American Aviation 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 North American Aviation Corp filed Critical North American Aviation Corp
Priority to GB1784566A priority Critical patent/GB1150542A/en
Publication of GB1150542A publication Critical patent/GB1150542A/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
    • G01S13/538—Discriminating between fixed and moving objects or between objects moving at different speeds eliminating objects that have not moved between successive antenna scans, e.g. area MTi
    • 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
    • G01S13/5242—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 with means for platform motion or scan motion compensation, e.g. airborne MTI
    • 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
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/288—Coherent receivers

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

1,150,542. Pulse radar. NORTH AMERICAN AVIATION Inc. 22 April, 1966, No. 17845/66. Heading H4D. The receiver of a pulse radar system is provided with a phase coherent reference signal by mean responsive either to a transmitted pulse or to an early ground-return echo. In the first instance it is ensured that the phase reference signal corresponds to the state of the CW oscillator at the time of the transmitted pulse and any interim filter or variation in the CW oscillator up to the time of the received echo signal does not therefore affect this reference. In the second instance, when the receiver forms part of an AMTI radar, the Doppler-shift effects in both ground clutter return and moving target echoes due to the motion of the radar itself are overcome by storing an early ground return echo to provide a subsequent clutter reference for echo signals received during the remainder of the pulse repetition period. In one embodiment, Fig. 1, relating to the first instance mentioned above, a sampled signal source 15 co-operates with the transmitter 10 to provide reference signals to an input line 14 of the receiver 11. Terminals 20, 22 of a switch 18 couple sampled energy from source 15 to a delay line 16 for the duration of the sampled energy, in response to the application of the energy sample to the switch control terminal 19. After such duration, terminals 21, 22 are reconnected and the switch 18 returns to its normal state. The delay line 16 is a wedge-shaped block of quartz having an inclined face stepped or roughened to provide a plurality of discrete reflecting surfaces whereby the interval over which the pulsed energy echoes are received back from the delay line is substantially greater than the duration of the energy sample. The echo signals from the delay line are supplied through terminals 21, 22 to a saturating amplifier 17 and then to signal combining means 13 for use as phase-reference signals. An elaboration of Fig. 1 is described with reference to Fig. 2 (not shown), whilst an embodiment relating to the second instance mentioned above involving an AMTI radar is described with reference to Fig. 3 (not shown).
GB1784566A 1966-04-22 1966-04-22 Radar Receiver Employing a Synthetic Coherent Reference Expired GB1150542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1784566A GB1150542A (en) 1966-04-22 1966-04-22 Radar Receiver Employing a Synthetic Coherent Reference

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1784566A GB1150542A (en) 1966-04-22 1966-04-22 Radar Receiver Employing a Synthetic Coherent Reference

Publications (1)

Publication Number Publication Date
GB1150542A true GB1150542A (en) 1969-04-30

Family

ID=10102232

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1784566A Expired GB1150542A (en) 1966-04-22 1966-04-22 Radar Receiver Employing a Synthetic Coherent Reference

Country Status (1)

Country Link
GB (1) GB1150542A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389904A1 (en) * 1977-05-06 1978-12-01 Int Standard Electric Corp
EP2594955A4 (en) * 2010-07-16 2016-01-20 Panasonic Ip Man Co Ltd Radar device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389904A1 (en) * 1977-05-06 1978-12-01 Int Standard Electric Corp
EP2594955A4 (en) * 2010-07-16 2016-01-20 Panasonic Ip Man Co Ltd Radar device

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees