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US3725922A
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Convergence rate improvement for adaptive receiving array antennas of higher order than 2-pulse mti cancellers
Assignee: Technology Service Corp
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Filing: 1971-09-13
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Granted: 1973-04-03
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Expires: 1991-09-13
Abstract
Abstract A system for improving the convergence rate of adaptive receiving array antenna systems in MTI radar systems, having cancellers of higher orders than a 2-pulse canceller, is provided by a transformation matrix according to the following technique. Form the matrix H with elements
Inventors
- 👤 L Brennan
- 👤 I Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/5242; H; H01; H01Q; H01Q3/00; H01Q3/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A method for improving the convergence rate of adaptive receiving antenna systems for moving target indication from signal return in which NK samples of signal return are received, retaining both amplitude and phase information in each sample, where N is the number of receiving elements in an antenna array from one to any integer greater than one, and K is a number of consecutive samples from each array element and each range cell from three to any integer greater than three for a pulse cancellation of higher order than two pulses, and in which each of said NK samples is multiplied by adaptively controlled complex weights Wnk before summing samples to obtain an output according to the equation
Claim 2
Independent Claim
118 words
A method for improving the convergence rate of adaptive receiving antenna systems for moving target indication from signal return in which NK samples of signal return are received, retaining both amplitude and phase information in each sample, where N is the number of receiving elements in an antenna array from one to any integer greater than one, and K is a number of consecutive samples from each array element and each range cell from three to any integer greater than three for a pulse cancellation of higher order than two pulses, and in which each of said NK samples is multiplied by adaptively controlled complex weights Wnk before summing samples to obtain an output according to the equation
Claim 3
Dependent Claim
42 words
A method for improving the convergence rate of adaptive receiving antenna systems for moving target indication from return signals according to claim 1 using a double-delay canceller wherein K is equal to three, whereby U is the transformation matrix having the form
Claim 4
Dependent Claim
60 words
A method as defined in claim 2 wherein said scan angle theta is 90* relative to the direction of motion, whereby transformed signals Xn1, Xn2 and Xn3 are computed according to the following equations: Xn1 (GFAC/ Square Root 6) (Vn1 - 2Vn2 + Vn3) Xn2 (1/ Square Root 2) (Vn1 - Vn3) Xn3 (1/ Square Root 3) (Vn1 + Vn3)
Claim 5
Dependent Claim
101 words
Apparatus for improving the convergence rate of an adaptive receiving antenna system for moving-target indication from a transmitted signal return, in which system NK samples Vnk of signal return are received, where N is the number of receiving elements in an antenna array from one to any integer greater than one, and K is a number from three to any integer greater than three of consecutive samples from each array element and each range cell, and in which each of said samples Vnk is multiplied by adaptively controlled complex weights Wnk before summing to obtain an output according to the equation
Claim 6
Dependent Claim
101 words
Apparatus for improving the convergence rate of an adaptive receiving antenna system for moving-target indication from a transmitted signal return, in which system NK samples Vnk of signal return are received, where N is the number of receiving elements in an antenna array from one to any integer greater than one, and K is a number from three to any integer greater than three of consecutive samples from each array element and each range cell, and in which each of said samples Vnk is multiplied by adaptively controlled complex weights Wnk before summing to obtain an output according to the equation
Claim 7
Dependent Claim
25 words
Apparatus as defined in claim 4 wherein K is equal to three for a double-delay canceller, whereby U is the transformation matrix having the form
Claim 8
Dependent Claim
59 words
Apparatus as defined in claim 5 wherein said scan angle theta is 90* relative to direction of motion whereby transformed signals Xn1, Xn2 and Xn3 are computed according to the following equations: Xn1 (GFAC/ Square Root 6) (Vn1 -2Vn2 + Vn3) Xn2 (1/ Square Root 2) (Vn1 - Vn3) Xn3 (1/ Square Root 3) (Vn1 + Vn2 + Vn3)
References Cited (Backward Citations)
US3587097A
Cited
US3417396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |