US3745573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity fuze circuit
Assignee: United States Department of the Navy
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Filing: 1963-09-24
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Granted: 1973-07-10
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Expires: 1983-09-24
Abstract
Abstract 1. In a proximity fuze system the combination comprising, A. TRANSMITTING CIRCUIT MEANS INCLUDING AN OSCILLATOR FOR TRANSMITTING A FREQUENCY MODULATED WAVE OF HIGH FREQUENCY ENERGY, B. RECEIVING CIRCUIT MEANS INCLUDING A BALANCED MIXER FOR RECEIVING SAID TRANSMITTED ENERGY WHEN REFLECTED FROM A TARGET, C. SAID BALANCED MIXER BEING COUPLED TO SAID OSCILLATOR FOR PRODUCING AN OUTPUT WHICH IS THE DIFFERENCE IN FREQUENCY OF SAID TRANSMITTED SIGNAL AND SAID RECEIVED SIGNAL, D. AMPLIFIER MEANS COUPLED TO SAID MIXER FOR AMPLIFYING SAID MIXER OUTPUT, E. A BIASED DIODE LOW LEVEL DETECTOR MEANS COUPLED TO SAID AMPLIFIER FOR DETECTING THE DOPPLER SIGNAL FROM SAID MIXER, F. ENVELOPE DETECTING MEANS COUPLED TO THE OUTPUT OF SAID LOW LEVEL DETECTOR MEANS FOR MASKING BACKGROUND SIGNALS OVER A WIDE DYNAMIC RANGE PRESENT IN SAID REFLECTED ENERGY, G. AND SIGNAL PROCESSING CIRCUIT MEANS COUPLED TO SAID ENVELOPE DETECTING MEANS FOR UTILIZING SAID DOPPLER SIGNAL.
Inventors
- 👤 J Dick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:27
CPC Classifications
F; F42; F42C; F42C13/00; F42C13/04; F42C13/045
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said received signal, d. aMplifier means coupled to said mixer for amplifying said mixer output, e. a biased diode low level detector means coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. and signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
Claim 2
Dependent Claim
147 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said received signal, d. aMplifier means coupled to said mixer for amplifying said mixer output, e. a biased diode low level detector means coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. and signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
Claim 3
Dependent Claim
158 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said received signal, d. amplifier means coupled to said mixer for amplifying said mixer output, e. a biased diode detector means capable of linear detection at signal levels as low as three millivolts RMS coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. said signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
Claim 4
Dependent Claim
158 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said received signal, d. amplifier means coupled to said mixer for amplifying said mixer output, e. a biased diode detector means capable of linear detection at signal levels as low as three millivolts RMS coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. said signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
Claim 5
Dependent Claim
150 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said received signal, d. amplifier means coupled to said mixer for amplifying said mixer output, e. a biased silicon diode biased in the linear operating range coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. and signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
Claim 6
Dependent Claim
150 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said received signal, d. amplifier means coupled to said mixer for amplifying said mixer output, e. a biased silicon diode biased in the linear operating range coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. and signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
Claim 7
Dependent Claim
157 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said receiving signal, d. amplifier means coupled to said mixer for amplifying said mixer output, e. a biased silicon diode capable of linear detection at signal levels as low as three millivolts RMS coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. and signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
Claim 8
Dependent Claim
157 words
In a proximity fuze system the combination comprising, a. transmitting circuit means including an oscillator for transmitting a frequency modulated wave of high frequency energy, b. receiving circuit means including a balanced mixer for receiving said transmitted energy when reflected from a target, c. said balanced mixer being coupled to said oscillator for producing an output which is the difference in frequency of said transmitted signal and said receiving signal, d. amplifier means coupled to said mixer for amplifying said mixer output, e. a biased silicon diode capable of linear detection at signal levels as low as three millivolts RMS coupled to said amplifier for detecting the doppler signal from said mixer, f. envelope detecting means coupled to the output of said low level detector means for masking background signals over a wide dynamic range present in said reflected energy, g. and signal processing circuit means coupled to said envelope detecting means for utilizing said doppler signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |