US3870995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic countermeasures system
Assignee: United States Department of the Navy
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Filing: 1971-02-25
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Granted: 1975-03-11
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Expires: 1991-02-25
Abstract
Abstract A system for preventing an ECM receiver employed to intercept enemy signals and to set a jamming transmitter to the same frequency from being subject to interference by its own jamming output. By blanking the jamming signal during the receiver CRT sweep interval, and negating every Nth blanking pulse, both the enemy''s signals and the jamming signal are simultaneously displayed for monitoring, the former being visible through the latter so that any interruption or frequency shift in the enemy signal is readily detectable.
Inventors
- 👤 Robert L Nielson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:24
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
In a countermeasures system including an ECM receiver associated with a cathode-ray beam indicating device on the screen of which may be displayed a visual indication representative of the signal received fRom an enemy radar, and wherein a transmitter is employed to send out a jamming signal on a frequency essentially identical to that of such radar in order to confuse the enemy operator thereof, the improvement which comprises means for preventing the visual indication on said screen representative of such jamming signal from obscuring the visual indication representative of said radar signal, so as to enable the operator of said ECM receiver to monitor both such indications concurrently, said means including means for selectively interrupting the operation of said jamming signal transmitter synchronously with the deflection of the cathode-ray beam of said indicating device and in time coincidence therewith, said interrupting means operating during every Nth deflection of said beam, with N being equal to at least two.
Claim 2
Dependent Claim
159 words
In a countermeasures system including an ECM receiver associated with a cathode-ray beam indicating device on the screen of which may be displayed a visual indication representative of the signal received fRom an enemy radar, and wherein a transmitter is employed to send out a jamming signal on a frequency essentially identical to that of such radar in order to confuse the enemy operator thereof, the improvement which comprises means for preventing the visual indication on said screen representative of such jamming signal from obscuring the visual indication representative of said radar signal, so as to enable the operator of said ECM receiver to monitor both such indications concurrently, said means including means for selectively interrupting the operation of said jamming signal transmitter synchronously with the deflection of the cathode-ray beam of said indicating device and in time coincidence therewith, said interrupting means operating during every Nth deflection of said beam, with N being equal to at least two.
Claim 3
Dependent Claim
159 words
In a countermeasures system including an ECM receiver associated with a cathode-ray beam indicating device on the screen of which may be displayed a visual indication representative of the signal received fRom an enemy radar, and wherein a transmitter is employed to send out a jamming signal on a frequency essentially identical to that of such radar in order to confuse the enemy operator thereof, the improvement which comprises means for preventing the visual indication on said screen representative of such jamming signal from obscuring the visual indication representative of said radar signal, so as to enable the operator of said ECM receiver to monitor both such indications concurrently, said means including means for selectively interrupting the operation of said jamming signal transmitter synchronously with the deflection of the cathode-ray beam of said indicating device and in time coincidence therewith, said interrupting means operating during every Nth deflection of said beam, with N being equal to at least two.
Claim 4
Dependent Claim
159 words
In a countermeasures system including an ECM receiver associated with a cathode-ray beam indicating device on the screen of which may be displayed a visual indication representative of the signal received fRom an enemy radar, and wherein a transmitter is employed to send out a jamming signal on a frequency essentially identical to that of such radar in order to confuse the enemy operator thereof, the improvement which comprises means for preventing the visual indication on said screen representative of such jamming signal from obscuring the visual indication representative of said radar signal, so as to enable the operator of said ECM receiver to monitor both such indications concurrently, said means including means for selectively interrupting the operation of said jamming signal transmitter synchronously with the deflection of the cathode-ray beam of said indicating device and in time coincidence therewith, said interrupting means operating during every Nth deflection of said beam, with N being equal to at least two.
Claim 5
Dependent Claim
16 words
The system of claim 1 in which said interrupting means includes a generator of blanking pulses.
Claim 6
Dependent Claim
24 words
The system of claim 2 in which the output of said blanking pulse generator is applied to said jamming transmitter through a logic circuit.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |