US3597762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instantaneous range circuit
Assignee: United States Department of the Navy
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Filing: 1962-02-06
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Granted: 1971-08-03
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Expires: 1982-02-06
Abstract
Abstract This invention relates to a counter-countermeasure for use in radar systems and more specifically to a circuit which is capable of giving an indication of the range of a target notwithstanding the fact that the target is jamming the radar equipment.
Inventors
- 👤 Paul L Dimatteo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:36
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
A circuit for use with a radar system which is subject to being jammed by an external signal transmitter carried by a target comprising detector means for detecting the existence of a jamming signal, a multivibrator connected to said detector means and having first and second output lines, an input line connected to said multivibrator for cyclically interrogating said multivibrator to establish a positive voltage level on said second output line during periods when jamming does not occur, means for deriving a voltage pulse of magnitude proportional to the range of said target, coincidence circuit means connected to said second output line for passing said voltage pulse only during periods when jamming does not occur, phantastron circuit means responsive to the voltage pulse passed by said coincidence circuit for inhibiting the latter, peak detecting and pulse stretching circuits connected to said coincidence circuit for stretching said voltage pulse while maintaining the amplitude proportional to the range of said target, a ground discharge circuit connected to the output of said peak detector and pulse stretcher circuits and to the output of said phantastron circuit for passing said stretched voltage pulse when said coincidence circuit is inhibited and a meter connected to said ground discharge circuit and responsive to said stretched voltage pulse for registering the range of said target.
Claim 2
Dependent Claim
218 words
A circuit for use with a radar system which is subject to being jammed by an external signal transmitter carried by a target comprising detector means for detecting the existence of a jamming signal, a multivibrator connected to said detector means and having first and second output lines, an input line connected to said multivibrator for cyclically interrogating said multivibrator to establish a positive voltage level on said second output line during periods when jamming does not occur, means for deriving a voltage pulse of magnitude proportional to the range of said target, coincidence circuit means connected to said second output line for passing said voltage pulse only during periods when jamming does not occur, phantastron circuit means responsive to the voltage pulse passed by said coincidence circuit for inhibiting the latter, peak detecting and pulse stretching circuits connected to said coincidence circuit for stretching said voltage pulse while maintaining the amplitude proportional to the range of said target, a ground discharge circuit connected to the output of said peak detector and pulse stretcher circuits and to the output of said phantastron circuit for passing said stretched voltage pulse when said coincidence circuit is inhibited and a meter connected to said ground discharge circuit and responsive to said stretched voltage pulse for registering the range of said target.
Claim 3
Dependent Claim
46 words
In the circuit defined in claim 1, a relay means energized by a positive voltage level on said first output line of said multivibrator for passing said stretched voltage pulse to the radar designation equipment during said periods when the radar system is not being jammed.
Claim 4
Dependent Claim
137 words
A circuit for use with a radar system which is subject to being jammed by an external signal transmitter carried by a target comprising means for detecting the presence of a jamming signal, means responsive to said detecting means and a periodic interrogation signal for developing an enabling output only during periods when jamming does not occur, means for deriving a voltage pulse of magnitude proportional to the range of said target, coincidence circuit means responsive to saiD enabling output for passing said voltage pulse, inhibit means responsive to said passed voltage pulse for disabling said coincidence circuit, means connected to said coincidence circuit for retaining said passed voltage pulse for a predetermined period of time and means responsive to said retained voltage pulse for indicating the range of said target over said predetermined period of time.
Claim 5
Dependent Claim
137 words
A circuit for use with a radar system which is subject to being jammed by an external signal transmitter carried by a target comprising means for detecting the presence of a jamming signal, means responsive to said detecting means and a periodic interrogation signal for developing an enabling output only during periods when jamming does not occur, means for deriving a voltage pulse of magnitude proportional to the range of said target, coincidence circuit means responsive to saiD enabling output for passing said voltage pulse, inhibit means responsive to said passed voltage pulse for disabling said coincidence circuit, means connected to said coincidence circuit for retaining said passed voltage pulse for a predetermined period of time and means responsive to said retained voltage pulse for indicating the range of said target over said predetermined period of time.
Claim 6
Dependent Claim
136 words
A circuit for use with a radar system which is subject to being jammed by an external signal transmitter carried by a target comprising detector means for detecting the existence of a jamming signal, a multivibrator connected to said detector means and having an output line, an input line connected to said multivibrator for cyclically interrogating said multivibrator to establish an enabling output on said output only during periods when jamming does not occur, means for deriving a voltage pulse of magnitude proportional to the range of a target, a coincidence circuit responsive to said enabling output for passing said voltage pulse, means connected to said coincidence circuit for retaining the passed voltage pulse for a predetermined period of time and indicating means responsive to said retained voltage pulse for indicating the range of said target.
Claim 7
Dependent Claim
136 words
A circuit for use with a radar system which is subject to being jammed by an external signal transmitter carried by a target comprising detector means for detecting the existence of a jamming signal, a multivibrator connected to said detector means and having an output line, an input line connected to said multivibrator for cyclically interrogating said multivibrator to establish an enabling output on said output only during periods when jamming does not occur, means for deriving a voltage pulse of magnitude proportional to the range of a target, a coincidence circuit responsive to said enabling output for passing said voltage pulse, means connected to said coincidence circuit for retaining the passed voltage pulse for a predetermined period of time and indicating means responsive to said retained voltage pulse for indicating the range of said target.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |