Patent US5539412A successfully refreshed from Google Patents.
US5539412A
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Radar system with adaptive clutter suppression
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1994-04-29
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Granted: 1996-07-23
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Expires: 2014-04-29
Abstract
Abstract A method of spectral estimation of a received radar signal wherein an image of the received radar signal is applied to windows of differing prolate spheroidal sequences to calculate multiple eigenspectra. The value of each of said sequences are multiplied with the radar signal, and the Fourier transforms of the products provide a plurality of realizations of orthogonal eigenspectra. The orthogonal eigenspectra are combined into a minimum variance, low bias estimate of the mean power spectrum and an estimate of a variance of said spectrum for each frequency in the spectrum to provide a more accurate estimate of back ground noise and to further improve detection performance.
Inventors
- 👤 Howard B. Mendelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:21
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/5244; G01R; G01R23/00; G01R23/16; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/288; G01S7/2883
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A method of spectral estimation in a radar system, the method comprising the steps of: receiving a radar signal; applying an image of said radar signal to windows of different prolate spheroidal; multiplying the products of each of said sequences with the radar signal; computing Fourier transform of the product of each of said sequences with the said radar signal thereby providing a plurality of realizations of orthogonal eigenspectra and combining the said orthogonal eigenspectra into a minimum variance, low bias estimate of the mean power spectrum and an estimate of the variance of said spectrum for each frequency in the said spectrum to thereby provide a more accurate estimate of back ground noise and further improve detection performance.
Claim 2
Independent Claim
119 words
A method of spectral estimation in a radar system, the method comprising the steps of: receiving a radar signal; applying an image of said radar signal to windows of different prolate spheroidal; multiplying the products of each of said sequences with the radar signal; computing Fourier transform of the product of each of said sequences with the said radar signal thereby providing a plurality of realizations of orthogonal eigenspectra and combining the said orthogonal eigenspectra into a minimum variance, low bias estimate of the mean power spectrum and an estimate of the variance of said spectrum for each frequency in the said spectrum to thereby provide a more accurate estimate of back ground noise and further improve detection performance.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |