Patent US4160975A successfully refreshed from Google Patents.
US4160975A
Expired / Lapsed
US
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Correction circuit for wide bandwidth antenna
Assignee: Raytheon Co
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Filing: 1978-06-27
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Granted: 1979-07-10
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Expires: 1998-06-27
Abstract
Abstract In a radar system employing an array antenna and microwave circuitry coupled thereto for developing sum and difference signals, a correction circuit utilizes the sum and difference signals for providing increased accuracy to elevation and azimuthal angle measurements of wide bandwidth radar signals. A correction is applied to the difference signal by subtracting therefrom a weighted time derivative of the sum channel, the weighting being proportional to the boresight error slope and the sines of the elevation and azimuth angles.
Inventors
- 👤 Fritz Steudel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:42
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/80; G01S3/82; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4409; G01S13/66; G01S13/68; G01S13/685
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
In a monopulse radar system incorporating a phased array antenna and a microwave circuit coupled to said antenna for producing sum signals in a sum channel and difference signals in a difference channel to provide a measurement of the angle of orientation of a radar signal incident upon said antenna, a correction circuit coupled to said sum and difference channels for correcting said measurement from effects of a relatively wide bandwidth of said radar signal comprising: means for differentiating said sum signal with respect to time to provide a derivative thereof; means for weighting said derivative with a weighting factor proportional to the rate of change of said difference signal with respect to the orientation of said radar signal to provide a weighted derivative; and means for subtracting said weighted derivative from said difference signal to provide a corrected difference signal.
Claim 2
Dependent Claim
141 words
In a monopulse radar system incorporating a phased array antenna and a microwave circuit coupled to said antenna for producing sum signals in a sum channel and difference signals in a difference channel to provide a measurement of the angle of orientation of a radar signal incident upon said antenna, a correction circuit coupled to said sum and difference channels for correcting said measurement from effects of a relatively wide bandwidth of said radar signal comprising: means for differentiating said sum signal with respect to time to provide a derivative thereof; means for weighting said derivative with a weighting factor proportional to the rate of change of said difference signal with respect to the orientation of said radar signal to provide a weighted derivative; and means for subtracting said weighted derivative from said difference signal to provide a corrected difference signal.
Claim 3
Dependent Claim
61 words
A system according to claim 1 wherein said sum channel signal is represented by a complex number having a real part and an imaginary part, and wherein said weighting factor is also proportional to the sine of the angle of orientation of a beam produced by said antenna, said factor being in quadrature with the real part of said sum signal.
Claim 4
Dependent Claim
101 words
In a system for measuring the angle of orientation of a beam of radiation relative to a phased array antenna, said system providing a sum channel signal and a difference channel signal, a correction circuit comprising: means for differentiating said sum channel signal to provide a derivative thereof; means for multiplying said derivative by a factor representing the orientation of said beam and by a factor representing the magnitude of the boresight error slope of said phased array antenna to provide said weighted derivative; and means for subtracting said weighted derivative from said difference signal to provide a corrected difference signal.
Claim 5
Dependent Claim
101 words
In a system for measuring the angle of orientation of a beam of radiation relative to a phased array antenna, said system providing a sum channel signal and a difference channel signal, a correction circuit comprising: means for differentiating said sum channel signal to provide a derivative thereof; means for multiplying said derivative by a factor representing the orientation of said beam and by a factor representing the magnitude of the boresight error slope of said phased array antenna to provide said weighted derivative; and means for subtracting said weighted derivative from said difference signal to provide a corrected difference signal.
Claim 6
Dependent Claim
35 words
A system according to claim 3 wherein said derivative is accomplished by the subtraction of one of two serially occurring samples to said sum channel signal from the second of said two serially occurring samples.
References Cited (Backward Citations)
US3794998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |