US3719944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absolute range fuze system using limiting or agc
Assignee: United States Department of the Navy
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Filing: 1957-03-11
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Granted: 1973-03-06
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Expires: 1977-03-11
Abstract
Abstract 1. An FM doppler fuze system comprising means for transmitting a signal having a carrier frequency modulated by a band of random noise, means for mixing the transmitted signal with a return echo signal modified by the doppler effect of the relative movement between the fuze and a target, low pass filter means for deriving an output adapted to actuate the fuze from the low frequency doppler portion of the output from said mixing means, and means coupled between said mixing means and said low pass filter to maintain said output proportional to the distance from said fuze to said target and independent of the size of said target.
Inventors
- 👤 D Adrian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:09
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/346; F; F42; F42C; F42C13/00; F42C13/04; F42C13/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
An FM doppler fuze system comprising means for transmitting a signal having a carrier frequency modulated by a band of random noise, means for mixing the transmitted signal with a return echo signal modified by the doppler effect of the relative movement between the fuze and a target, low pass filter means for deriving an output adapted to actuate the fuze from the low frequency doppler portion of the output from said mixing means, and means coupled between said mixing means and said low pass filter to maintain said output proportional to the distance from said fuze to said target and independent of the size of said target.
Claim 2
Dependent Claim
108 words
An FM doppler fuze system comprising means for transmitting a signal having a carrier frequency modulated by a band of random noise, means for mixing the transmitted signal with a return echo signal modified by the doppler effect of the relative movement between the fuze and a target, low pass filter means for deriving an output adapted to actuate the fuze from the low frequency doppler portion of the output from said mixing means, and means coupled between said mixing means and said low pass filter to maintain said output proportional to the distance from said fuze to said target and independent of the size of said target.
Claim 3
Dependent Claim
108 words
An FM doppler fuze system comprising means for transmitting a signal having a carrier frequency modulated by a band of random noise, means for mixing the transmitted signal with a return echo signal modified by the doppler effect of the relative movement between the fuze and a target, low pass filter means for deriving an output adapted to actuate the fuze from the low frequency doppler portion of the output from said mixing means, and means coupled between said mixing means and said low pass filter to maintain said output proportional to the distance from said fuze to said target and independent of the size of said target.
Claim 4
Dependent Claim
108 words
An FM doppler fuze system comprising means for transmitting a signal having a carrier frequency modulated by a band of random noise, means for mixing the transmitted signal with a return echo signal modified by the doppler effect of the relative movement between the fuze and a target, low pass filter means for deriving an output adapted to actuate the fuze from the low frequency doppler portion of the output from said mixing means, and means coupled between said mixing means and said low pass filter to maintain said output proportional to the distance from said fuze to said target and independent of the size of said target.
Claim 5
Dependent Claim
132 words
The fuze system comprising a white noise source adapted to produce a uniform spectrum of random frequency signals, a band pass filter operatively associated with said white noise source and adapted to pass a band of said noise, means for modulating a carrier frequency with said band of noise and transmitting a signal in the direction of the target, means adapted to mix a portion of said transmitted signal and a return echo signal from a target, low pass filter means adapted to pass the low frequency band from the output of said mixer for actuating a fuze, and means coupled between said mixing means and said low pass filter to maintain said output proportional to the distance from said fuze to said target and independent of the size of said target.
Claim 6
Dependent Claim
132 words
The fuze system comprising a white noise source adapted to produce a uniform spectrum of random frequency signals, a band pass filter operatively associated with said white noise source and adapted to pass a band of said noise, means for modulating a carrier frequency with said band of noise and transmitting a signal in the direction of the target, means adapted to mix a portion of said transmitted signal and a return echo signal from a target, low pass filter means adapted to pass the low frequency band from the output of said mixer for actuating a fuze, and means coupled between said mixing means and said low pass filter to maintain said output proportional to the distance from said fuze to said target and independent of the size of said target.
References Cited (Backward Citations)
US2253975A
Cited
GB724555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |