Patent US4642643A successfully refreshed from Google Patents.
US4642643A
Expired / Lapsed
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Noise jammer discrimination by noise spectral bandwidth
Assignee: United States Department of the Air Force
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Filing: 1984-06-07
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Granted: 1987-02-10
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Expires: 2004-06-07
Abstract
Abstract A method for distinguishing between multiple noise jammer sources having different noise spectral bandwidths. Noise signals are detected over a relatively narrow detection bandwidth. The percent of time that the jammer spectral noise is within the fixed detection bandwidth is used to estimate the jammer spectral bandwidth.
Inventors
- 👤 Carl D. Wise
- 👤 Frank W. Hays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:44
CPC Classifications
H; H04; H04K; H04K3/00; H04K3/20; H04K3/22; G; G01; G01S; G01S7/00; G01S7/02; G01S7/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A method of distinguishing between multiple noise jammer sources having different noise spectral bandwidths comprising the steps of: (a) detecting noise signals emitted by a selected noise jammer source by means of a receiver having a narrow bandwidth compared to the potential minimum spectral bandwidth of said noise signals; (b) forming noise pulses as said noise signals from said noise jammer source sweep through the bandwidth of said receiver; (c) determining the average duty cycle of said noise pulses; and (d) characterizing the noise spectral bandwidth from said duty cycle and from the known bandwidth of said receiver to uniquely identify said selected noise jammer source.
Claim 2
Independent Claim
106 words
A method of distinguishing between multiple noise jammer sources having different noise spectral bandwidths comprising the steps of: (a) detecting noise signals emitted by a selected noise jammer source by means of a receiver having a narrow bandwidth compared to the potential minimum spectral bandwidth of said noise signals; (b) forming noise pulses as said noise signals from said noise jammer source sweep through the bandwidth of said receiver; (c) determining the average duty cycle of said noise pulses; and (d) characterizing the noise spectral bandwidth from said duty cycle and from the known bandwidth of said receiver to uniquely identify said selected noise jammer source.
Claim 3
Independent Claim
100 words
A method of distinquishing between multiple noise jammer sources having different noise spectral bandwidths comprising the steps of: (a) detecting noise signals emitted by a selected noise jammer source within a noise detection bandwidth narrower than the potential minimum spectral bandwidth of said noise jammer source; (b) forming noise pulses as said noise signals from said selected jammer source sweep through said noise detection bandwidth; (c) determining the average duty cycle of said noise pulses; and (d) characterizing the noise spectral bandwidth from said duty cycle and from said noise detection bandwidth to uniquely identify said selected noise jammer source.
Claim 4
Independent Claim
100 words
A method of distinquishing between multiple noise jammer sources having different noise spectral bandwidths comprising the steps of: (a) detecting noise signals emitted by a selected noise jammer source within a noise detection bandwidth narrower than the potential minimum spectral bandwidth of said noise jammer source; (b) forming noise pulses as said noise signals from said selected jammer source sweep through said noise detection bandwidth; (c) determining the average duty cycle of said noise pulses; and (d) characterizing the noise spectral bandwidth from said duty cycle and from said noise detection bandwidth to uniquely identify said selected noise jammer source.
Claim 5
Dependent Claim
37 words
A method of distinquishing between noise jammer sources as defined in claim 2 wherein: said noise detection bandwidth is selected to be less than one half of said potential minimum spectral bandwidth of said noise jammer source.
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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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |