GB1481517A - Radar - Google Patents

Radar

Info

Publication number
GB1481517A
GB1481517A GB47387/73A GB4738773A GB1481517A GB 1481517 A GB1481517 A GB 1481517A GB 47387/73 A GB47387/73 A GB 47387/73A GB 4738773 A GB4738773 A GB 4738773A GB 1481517 A GB1481517 A GB 1481517A
Authority
GB
United Kingdom
Prior art keywords
phase correction
phase
comparator
oct
cells
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
GB47387/73A
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB47387/73A priority Critical patent/GB1481517A/en
Publication of GB1481517A publication Critical patent/GB1481517A/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
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
    • 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
    • G01S7/2806—Employing storage or delay devices which preserve the pulse form of the echo signal, e.g. for comparing and combining echoes received during different periods

Landscapes

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

Abstract

1481517 Radar EMI Ltd 9 Oct 1974 [10 Oct 1973] 47387/73 Heading H4D In a synthetic aperture radar incorporating phase correction to the video signals to compensate for lateral deviations of the aircraft from a presumed course, it is assumed that the target T is on a "flat Earth plane" ON Fig. 2, e.g. for a range call r target T is mistakenly assumed to be at N. When horizontal and vertical aircraft deviations (provided by double integrating accelerometer outputs) are thus incorrectly resolved along line ON instead of line OT, the resultant phase correction is also incorrect. To overcome this, Fig. 3, for each of the n range cells (the r<SP>th</SP> cell channel 2r is shown) phase corrections are applied for the assembled angle # 1 =O‰N and for (# 1 +1‹) and for (# 1 - 1‹). The three phase corrected video signals from circuit 3 are fed to a correlator 12 for comparison with a reference and a comparator 14 determines which phase correction yields the maximum correlation. The correct angle (# 1 +E)=OAT is thus determined and stored at 15 for use on the video signal. To increase the S/N ratios, the correlation comparison may be performed over several, e.g. five adjacent elevation cells, using integrators 13 and/or over several adjacent range cells. If an M.T.I. circuit is incorporated as described in Specification 1,481,414 and using a delay cancellor, the comparator 14 needs to seek a minimum rather than a maximum.
GB47387/73A 1974-10-09 1974-10-09 Radar Expired GB1481517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB47387/73A GB1481517A (en) 1974-10-09 1974-10-09 Radar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB47387/73A GB1481517A (en) 1974-10-09 1974-10-09 Radar

Publications (1)

Publication Number Publication Date
GB1481517A true GB1481517A (en) 1977-08-03

Family

ID=10444784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB47387/73A Expired GB1481517A (en) 1974-10-09 1974-10-09 Radar

Country Status (1)

Country Link
GB (1) GB1481517A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2183117A (en) * 1984-12-22 1987-05-28 Gen Electric Plc Compensating for radar motion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2183117A (en) * 1984-12-22 1987-05-28 Gen Electric Plc Compensating for radar motion

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921009