GB812877A - Improvements in or relating to radar apparatus - Google Patents

Improvements in or relating to radar apparatus

Info

Publication number
GB812877A
GB812877A GB2191357A GB2191357A GB812877A GB 812877 A GB812877 A GB 812877A GB 2191357 A GB2191357 A GB 2191357A GB 2191357 A GB2191357 A GB 2191357A GB 812877 A GB812877 A GB 812877A
Authority
GB
United Kingdom
Prior art keywords
gain
aerial
elevation
reduced
range
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
GB2191357A
Inventor
Eric Parker
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.)
Decca Record Co Ltd
Original Assignee
Decca Record Co Ltd
Filing date
Publication date
Application filed by Decca Record Co Ltd filed Critical Decca Record Co Ltd
Priority to FR1190648D priority Critical patent/FR1190648A/en
Publication of GB812877A publication Critical patent/GB812877A/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
    • G01S13/06—Systems determining position data of a target
    • G01S13/42—Simultaneous measurement of distance and other co-ordinates
    • G01S13/426—Scanning radar, e.g. 3D radar
    • 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
    • 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
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • 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
    • G01S7/34—Gain of receiver varied automatically during pulse-recurrence period, e.g. anti-clutter gain control

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

812,877. Radio direction finding. DECCA RECORD CO. Ltd. Oct. 7, 1957 [July 10, 1957], No. 21913/57. Class 40 (7). A radar apparatus of the type that uses an aerial which both scans in azimuth and node has a time-varied gain control adjusted in synchronism with the elevation of the aerial so that a reduced response to ground-clutter without loss of shortrange cover on high-flying targets is obtained. One possible form of gain/range characteristic is shown in Fig. 3 and it is seen that at low aerial elevations the gain is reduced from the maximum over a certain range, indicated by the full line, while at higher aerial elevations the range over which the gain is reduced is smaller, the gain characteristic at one such higher elevation being illustrated by the dotted line. The variation in gain with elevation and with range may be performed in steps or continuously and the maximum gain may be either at maximum elevation or below this point. In locations where the ground-clutter is unevenly distributed the gain may be further varied with the bearing of the aerial and in another embodiment the gain is reduced in accordance with the amplitude of the signals received during an immediately preceding period.
GB2191357A 1957-07-10 1957-07-10 Improvements in or relating to radar apparatus Expired GB812877A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR1190648D FR1190648A (en) 1957-07-10 1957-11-29 Radar improvements

Publications (1)

Publication Number Publication Date
GB812877A true GB812877A (en) 1959-05-06

Family

ID=1736580

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2191357A Expired GB812877A (en) 1957-07-10 1957-07-10 Improvements in or relating to radar apparatus

Country Status (1)

Country Link
GB (1) GB812877A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233982A2 (en) * 1986-02-21 1987-09-02 CONTRAVES ITALIANA S.p.A. 2-D pulse doppler radar
EP2150837A1 (en) * 2007-04-27 2010-02-10 Accipiter Radar Technologies, INC. Device&method for 3d height-finding avian radar

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233982A2 (en) * 1986-02-21 1987-09-02 CONTRAVES ITALIANA S.p.A. 2-D pulse doppler radar
EP0233982A3 (en) * 1986-02-21 1988-12-21 Contraves Italiana S.P.A. 2-d pulse doppler radar
EP2150837A1 (en) * 2007-04-27 2010-02-10 Accipiter Radar Technologies, INC. Device&method for 3d height-finding avian radar
EP2150837A4 (en) * 2007-04-27 2012-06-20 Accipiter Radar Technologies Inc Device&method for 3d height-finding avian radar
USRE45999E1 (en) 2007-04-27 2016-05-10 Accipiter Radar Technologies Inc. Device and method for 3D height-finding avian radar

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