US3852747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for neutralizing a fire-control radar
Assignee: Thales SA
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Filing: 1972-09-14
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Granted: 1974-12-03
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Expires: 1992-09-14
Abstract
Abstract A device for neutralizing a fire-control radar used in the fire control of guns, machine guns, missiles and the like. The device comprises an antenna for reception of radar signals connected to a receiver, at least one transmission antenna for emitting radiowave signals, and means between the output of said receiver and said transmission antenna to provide jamming radio-wave signals including a spectrum of noise and a sequence of false echoes.
Inventors
- 👤 J Morand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:30
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/38
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
171 words
A radar jamming device for jamming fire control radar searching for a target comprising: means for receiving radar signals from a fire control radar, noise generating means, means for initiating said noise generating means upon receipt of said radar signals from said fire control radar, means for transmitting said noise signals from said noise generating means, means for comparing the amplitude of said transmitted noise signals with said received radar signals, first means for controlling the amplitude of said transmitted noise signals in response to said comparing means for providing transmitted noise signals of approximately the same amplitude of said received radar signals, second means for controlling the amplitude of said transmitted noise signals for producing pulse signals having an amplitude larger than said transmitted noise signals, said pulse signals superimposed on said noise signals, and means for controlling the sequence of said pulse signals to produce false echoes at said fire control radar, whereby said false echoes produce a rapid variation in the telemetric target distance and prevent radar tracking.
Claim 2
Dependent Claim
171 words
A radar jamming device for jamming fire control radar searching for a target comprising: means for receiving radar signals from a fire control radar, noise generating means, means for initiating said noise generating means upon receipt of said radar signals from said fire control radar, means for transmitting said noise signals from said noise generating means, means for comparing the amplitude of said transmitted noise signals with said received radar signals, first means for controlling the amplitude of said transmitted noise signals in response to said comparing means for providing transmitted noise signals of approximately the same amplitude of said received radar signals, second means for controlling the amplitude of said transmitted noise signals for producing pulse signals having an amplitude larger than said transmitted noise signals, said pulse signals superimposed on said noise signals, and means for controlling the sequence of said pulse signals to produce false echoes at said fire control radar, whereby said false echoes produce a rapid variation in the telemetric target distance and prevent radar tracking.
Claim 3
Dependent Claim
22 words
A radar jamming device as recited in claim 1 comprising means to block said receiving means during transmission of said pulse signals.
Claim 4
Dependent Claim
124 words
A radar jamming device for neutralizing a fire control radar searching for a target comprising: receiving antenna means, a receiver coupled to said receiving antenna means for reception of incoming radar signals transmitted from said fire control radar, a noise generator activated by said receiver for generating noise signals, transmitting antenna means, variable gain amplifying means for amplifying said noise signals, said variable gain amplifying means connected to said transmitting antenna means for transmitting output signals, and means controlling the gain of said variable gain amplifying means for providing noise signals of amplitude substantially equal to a real echo signal received by said fire control radar and for simultaneously providing pulse signals having a magnitude greater than said noise signals for simulating false echoes.
Claim 5
Dependent Claim
124 words
A radar jamming device for neutralizing a fire control radar searching for a target comprising: receiving antenna means, a receiver coupled to said receiving antenna means for reception of incoming radar signals transmitted from said fire control radar, a noise generator activated by said receiver for generating noise signals, transmitting antenna means, variable gain amplifying means for amplifying said noise signals, said variable gain amplifying means connected to said transmitting antenna means for transmitting output signals, and means controlling the gain of said variable gain amplifying means for providing noise signals of amplitude substantially equal to a real echo signal received by said fire control radar and for simultaneously providing pulse signals having a magnitude greater than said noise signals for simulating false echoes.
Claim 6
Dependent Claim
69 words
A radar jamming device as recited in claim 3 wherein said gain controlling means for providing said noise signals comprises: a first coupling device for providing first signals responsive to the amplitude of the incoming radar signals, a second coupling device for providing second signals responsive to the amplitude of the output signals, and means for comparing said first and second signals for controlling said variable gain amplifying means.
Claim 7
Dependent Claim
56 words
A radar jamming device as recited in claim 4 wherein said gain controlling means for providing said pulse signals comprises: a sequencer having an input connected to said receiver and an output operatively connected to said variable gain amplifying means for controlling the amplitude and time sequence of said noise signals to produce said pulse signals.
Claim 8
Dependent Claim
23 words
A radar jamming device as recited in claim 5 further comprising a modulator connected between said sequencer and said variable gain amplifying means.
Claim 9
Dependent Claim
41 words
A radar jamming device as recited in claim 6 wherein said receiver has a blocking input terminal and wherein said modulator in connected to said blocking input terminal of said receiver for blocking said receiver during transmission of Said pulse signals.
Claim 10
Dependent Claim
71 words
A radar jamming device as recited in claim 6 wherein said variable gain amplifying means comprises: a first amplifier connected to receive said noise signals from said noise generator, and a second amplifier connected to said modulator, and wherein said transmitting antenna means comprises: a first transmitter connected to said first amplifier for transmitting said noise signals, and a second transmitter connected to said second amplifier for transmitting said pulse signals.
Claim 11
Dependent Claim
50 words
A radar jamming device as recited in claim 8 wherein said first transmitting antenna and said receiving antenna means are positioned on opposite sides of a stream-lined airborne body, and said second transmitting antenna is positioned in a forward portion of said body along a longitudinal axis of said body.
Claim 12
Dependent Claim
56 words
A radar jamming device as recited in claim 3 wherein said gain controlling means for providing said pulse signals comprises: a sequencer having an input connected to said receiver and an output operatively connected to said variable gain amplifying means for controlling the amplitude and time sequence of said noise signals to produce said pulse signals.
Claim 13
Dependent Claim
26 words
A radar jamming device as recited in claim 10 wherein said sequence is connected to said noise generator for controlling the time-elevation of said noise signals.
Claim 14
Dependent Claim
23 words
A radar jamming device as recited in claim 3 further comprising means for blocking said receiver during the transmission of said pulse signals.
Claim 15
Dependent Claim
22 words
A radar jamming device as recited in claim 12 wherein said transmitting and receiving antenna means are located close to one another.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |