US3876947A
Expired / Lapsed
US
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Adaptive antenna processing
Assignee: Alcatel CIT SA
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Filing: 1974-01-23
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Granted: 1975-04-08
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Expires: 1994-01-23
Abstract
Abstract Self-adapting anti-jamming device having (n + 1) sensors and enabling the restituting of the signal emitted by a source in the presence of n punctiform noise sources, comprising a combination assembly having an adder and n subtractors, an orthonormalization assembly comprising n AGC circuits, n (n - 1)/2! subtractors each combined with a correlation module, an intercorrelation set comprising n correlation modules, an adder and a subtractor.
Inventors
- 👤 Claude Giraudon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:02
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0891; H04B7/0894; G; G01; G01S; G01S7/00; G01S7/02; G01S7/36; G01S7/48; G01S7/495; G01S7/52; G01S7/537; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2605; H01Q3/2611; H01Q3/2617; H04B7/0837; H04B7/084
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
404 words
A self-adapting anti-jamming device receiving a signal having a narrow band with a central frequency coming from a signal source disturbed by a plurality of jammers, comprising (n +1) sensors receiving said signal, where n is an integer greater than 1, a plurality of amplifiers each connected to a respective sensor, a plurality of narrow band filters having a pass band centered on said central frequency and each connected to the output of a respective amplifier, a plurality of delay elements each connected to the output of a respective filter and providing at the output thereof the sum of the useful portion of said signal from said signal source and the noise from a respective one of said jammers, a first adder having inputs connected to the outputs of all of said delay elements, n first subtractors each having a positive input connected in common to the output of one of said delay elements and a negative input connected to the output of a respective one of the other delay elements. a sequence of channels each connected to the output of a respective one of said first subtractors, the first channel of the sequence comprising an automatic gain control circuit and each other channel of the sequence comprising a number of serially connected subcombinations equal to the number of the channel in the sequence less one in series with an automatic gain control circuit, said subcombinations each comprising a second subtractor having a positive input receiving the output of its respective first subtractor and a negative input receiving the output of a first correlation unit having one input connected to the positive input of said second subtractor and another input connected to the output of an automatic gain control circuit in a respective one of the preceeding channels of the sequence, said automatic gain control circut in each of said other channels has an input connected to the output of the second subtractor in the last of said serially connected subcombinations and a pluralilty of second correlation units each having one input connected in common to the output of said first adder and a second input connected to the output of a respective channel, a second adder connected to the outputs of said second correlation units, and a third subtractor having a possible input connected to the output of said first adder and a negative input connected to the output of said second adder.
Claim 2
Dependent Claim
404 words
A self-adapting anti-jamming device receiving a signal having a narrow band with a central frequency coming from a signal source disturbed by a plurality of jammers, comprising (n +1) sensors receiving said signal, where n is an integer greater than 1, a plurality of amplifiers each connected to a respective sensor, a plurality of narrow band filters having a pass band centered on said central frequency and each connected to the output of a respective amplifier, a plurality of delay elements each connected to the output of a respective filter and providing at the output thereof the sum of the useful portion of said signal from said signal source and the noise from a respective one of said jammers, a first adder having inputs connected to the outputs of all of said delay elements, n first subtractors each having a positive input connected in common to the output of one of said delay elements and a negative input connected to the output of a respective one of the other delay elements. a sequence of channels each connected to the output of a respective one of said first subtractors, the first channel of the sequence comprising an automatic gain control circuit and each other channel of the sequence comprising a number of serially connected subcombinations equal to the number of the channel in the sequence less one in series with an automatic gain control circuit, said subcombinations each comprising a second subtractor having a positive input receiving the output of its respective first subtractor and a negative input receiving the output of a first correlation unit having one input connected to the positive input of said second subtractor and another input connected to the output of an automatic gain control circuit in a respective one of the preceeding channels of the sequence, said automatic gain control circut in each of said other channels has an input connected to the output of the second subtractor in the last of said serially connected subcombinations and a pluralilty of second correlation units each having one input connected in common to the output of said first adder and a second input connected to the output of a respective channel, a second adder connected to the outputs of said second correlation units, and a third subtractor having a possible input connected to the output of said first adder and a negative input connected to the output of said second adder.
Claim 3
Dependent Claim
64 words
An anti-jamming device as defined in claim 1 wherein said automatic gain control circuit each comprise a divider having a first input connected to the output of a second subtractor in the channel, a linear detector having an input connected to the first input of said divider, and an integrator connected between the output of said detector and a second input of said divider.
Claim 4
Dependent Claim
151 words
An anti-jamming device as defined in claim 1 wherein each correlation unit comprises first and second circuits each including a peak limiter, a switch between the output of said switch and having one input connected to the output of said peak limiter and an integrator connected one input of a multiplier, the other input of the multiplier being connected to the input of said peak limiter, a phase shifter being connected to the input of the peak limit in said first circuit and a third adder having respective inputs connected to the outputs of the multipliers in said first and second circuits, said one input of each correlation unit being connected to a second input of each of said switches of said first and second circuits thereof and other input being connected to the input of said phase shifter and the input of the peak limiter of said second circuit thereof.
Claim 5
Dependent Claim
48 words
An anti-jamming device as defined in claim 1 wherein each correlation unit comprises means responsive to a signal u on said one input and a signal m on said other input for supplying an output m,um + m''.um'', m'' being the signal m shifted in phase by (.pi./2).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |