USH108H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar doppler processor using a fast orthogonalization network
Assignee: Government of the United States of America
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Filing: 1985-10-15
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Granted: 1986-08-05
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Expires: 2005-10-15
Abstract
Abstract A radar doppler processor, comprising M, M=N-1, tap delay lines; N digital multipliers; a N-point fast fourier transform network; and a fast orthogonalizing network to orthogonalize each subband output signal to eliminate cross-correlations between all output signals.
Inventors
- 👤 Karl Gerlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:26
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/526
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A radar doppler processor using a fast orthogonalization network, comprising: a radar echo signal input; M, M=N-1, Tap delay lines, for obtaining a set of N consecutive samples of said radar echo signal input, sampled at a rate of the radar system's pulse repetition rate; N digital multipliers to apply a weighting function, 1/a n , to each of said N consecutive samples, wherein ##EQU6## a N-point Fast Fourier Transform network for dividing the weighted samples into a set of doppler frequency subband signals and generating a separate subband output signal for each of the subbands; and a fast orthogonalizing network to orthogonalize each of said subband output signals to eliminate cross-correlations between all output signals.
Claim 2
Dependent Claim
116 words
A radar doppler processor using a fast orthogonalization network, comprising: a radar echo signal input; M, M=N-1, Tap delay lines, for obtaining a set of N consecutive samples of said radar echo signal input, sampled at a rate of the radar system's pulse repetition rate; N digital multipliers to apply a weighting function, 1/a n , to each of said N consecutive samples, wherein ##EQU6## a N-point Fast Fourier Transform network for dividing the weighted samples into a set of doppler frequency subband signals and generating a separate subband output signal for each of the subbands; and a fast orthogonalizing network to orthogonalize each of said subband output signals to eliminate cross-correlations between all output signals.
Claim 3
Independent Claim
71 words
A method of implementing a matched clutter filter in a dynamic signal environment, comprising the steps of: sampling the input radar echo signal at the system pulse repetition rate to obtain a set of N consecutive samples; weighting said N consecutive samples; Fast fourier transforming said weighted samples into a set of doppler frequency subband signals; and orthogonalizing the set of doppler frequency subband signals to eliminate cross-correlations between all signals.
Claim 4
Independent Claim
71 words
A method of implementing a matched clutter filter in a dynamic signal environment, comprising the steps of: sampling the input radar echo signal at the system pulse repetition rate to obtain a set of N consecutive samples; weighting said N consecutive samples; Fast fourier transforming said weighted samples into a set of doppler frequency subband signals; and orthogonalizing the set of doppler frequency subband signals to eliminate cross-correlations between all signals.
References Cited (Backward Citations)
US4190895A
Cited
US4459592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |