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US4581767A
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US
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Measurement of jamming effectiveness by cross correlation techniques (C)
Assignee: United States Department of the Army
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Filing: 1980-06-25
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Granted: 1986-04-08
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Expires: 2000-06-25
Abstract
Abstract A method and apparatus is disclosed for automatically and repeatably measng the effectiveness of jamming applied against a communications link. The method is machine performed, free of the need of listener personnel, and the recording and scoring tasks required in conventional methods. Using a ratio of auto and cross-correlation functions, a number is produced (CCI Index) which is the desired measure of jamming effectiveness. The CCI Index is a standardized value which indicates jamming effectiveness in any type communications link regardless of equipment or type of modulation in use. The Index, rapidly obtainable, can be used to pinpoint which jamming technique might be most advantageously employed, and by precisely how many db it would be superior.
Inventors
- 👤 Arthur M. Monsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:41
CPC Classifications
H; H04; H04K; H04K3/00; H04K3/40; H04K3/42; H04K3/44; H04K3/80; H04K3/94; H04K3/45
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
Apparatus for automatically measuring the degree of jamming effectively being applied against any particular communications link including transmitter and receiver portions therein, comprising; first circuit means for measuring a first peak value autocorrelation of a first signal being transmitted within the link; second circuit means for measuring a second peak value auto-correlation of the detected, receiver signal; third circuit means for attenuating the power level of the receiver's output so that said first and second peak values are equal; fourth circuit means for measuring a third peak value cross-correlation of the attenuated receiver signal with the said first transmitted signal; fifty means for forming a ratio of the said third peak value and first peak value; whereby the said determined ratio is a measure of the jamming effectiveness, measuring the degree of jamming present in the communications link.
Claim 2
Dependent Claim
138 words
Apparatus for automatically measuring the degree of jamming effectively being applied against any particular communications link including transmitter and receiver portions therein, comprising; first circuit means for measuring a first peak value autocorrelation of a first signal being transmitted within the link; second circuit means for measuring a second peak value auto-correlation of the detected, receiver signal; third circuit means for attenuating the power level of the receiver's output so that said first and second peak values are equal; fourth circuit means for measuring a third peak value cross-correlation of the attenuated receiver signal with the said first transmitted signal; fifty means for forming a ratio of the said third peak value and first peak value; whereby the said determined ratio is a measure of the jamming effectiveness, measuring the degree of jamming present in the communications link.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1 wherein the link is an FM voice communications link.
Claim 4
Dependent Claim
19 words
The apparatus of claim 1 wherein the said first, second and fourth circuit means comprise small, lightweight, correlator chips.
Claim 5
Dependent Claim
22 words
The apparatus of claim 1 wherein the said first, second and fourth circuit means are comprised within a single portable correlator unit.
Claim 6
Independent Claim
121 words
A method of automatically measuring the degree of jamming effectively being applied against a particular communications link having transmitter and receiver portions, comprising the steps of: measuring a first peak value autocorrelation of a first signal being transmitted within the link; measuring a second peak value autocorrelation of the detected, receiver signal; attenuating the power level of the receiver's output so that said first and second peak values are equal; measuring a third peak value crosscorrelation of the attenuated receiver signal with the said first transmitted signal; forming a ratio of the said third peak value and first peak value; whereby the determined ratio is a measure of the jamming effectiveness, measuring the degree of jamming present in the communications link.
Claim 7
Independent Claim
121 words
A method of automatically measuring the degree of jamming effectively being applied against a particular communications link having transmitter and receiver portions, comprising the steps of: measuring a first peak value autocorrelation of a first signal being transmitted within the link; measuring a second peak value autocorrelation of the detected, receiver signal; attenuating the power level of the receiver's output so that said first and second peak values are equal; measuring a third peak value crosscorrelation of the attenuated receiver signal with the said first transmitted signal; forming a ratio of the said third peak value and first peak value; whereby the determined ratio is a measure of the jamming effectiveness, measuring the degree of jamming present in the communications link.
References Cited (Backward Citations)
US4194205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |