US3906493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autocorrelation type spectral comparison fuze system
Assignee: United States Department of the Navy
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Filing: 1959-03-27
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Granted: 1975-09-16
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Expires: 1979-03-27
Abstract
Abstract 1. A fuze system comprising means for transmitting a frequency modulated carrier signal in the direction of a target, means coupled to said transmitting means for mixing a portion of said carrier signal with a return echo from said target and producing an output signal comprising a spectrum of coherent doppler wave portion plus an incoherent wave portion due to range noise and means coupled to said mixing means for comparing the energy level of the coherent portion of said output signal with the incoherent portion of said output signal of said mixing means whereby a firing signal is obtained only when the energy level of said coherent signal exceeds the energy level of said incoherent signal by a predetermined amount.
Inventors
- 👤 Donald J Adrian
- 👤 Carlton H Cash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:27
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: 10
Claim 1
Independent Claim
120 words
A fuze system comprising means for transmitting a frequency modulated carrier signal in the direction of a target, means coupled to said transmitting means for mixing a portion of said carrier signal with a return echo from said target and producing an output signal comprising a spectrum of coherent doppler wave portion plus an incoherent wave portion due to range noise, and means coupled to said mixing means for comparing the energy level of the coherent portion of said output signal with the incoherent portion of said output signal of said mixing means whereby a firing signal is obtained only when the energy level of said coherent signal exceeds the energy level of said incoherent signal by a predetermined amount.
Claim 2
Dependent Claim
120 words
A fuze system comprising means for transmitting a frequency modulated carrier signal in the direction of a target, means coupled to said transmitting means for mixing a portion of said carrier signal with a return echo from said target and producing an output signal comprising a spectrum of coherent doppler wave portion plus an incoherent wave portion due to range noise, and means coupled to said mixing means for comparing the energy level of the coherent portion of said output signal with the incoherent portion of said output signal of said mixing means whereby a firing signal is obtained only when the energy level of said coherent signal exceeds the energy level of said incoherent signal by a predetermined amount.
Claim 3
Dependent Claim
152 words
A radio fuze system comprising means for frequency modulating a carrier frequency with a band of noise, means coupling to said modulating means for transmitting said frequency modulated carrier signal in the direction of a target, receiving antenna means for receiving echos of said transmitted signal from said target means coupled to said transmitting meaNs and to said receiving antenna means for mixing a portion of said transmitted signal and a return echo signal from said target and producing an output signal comprising a band of coherent signals for in-range targets and a band of incoherent signals for out-of-range targets and means coupled to said mixing means for comparing the energy level of the coherent signals with the incoherent signals of said mixing means output whereby a firing signal is obtained only when the energy level of said coherent signals exceeds the energy level of said incoherent signals by a predetermined amount.
Claim 4
Dependent Claim
152 words
A radio fuze system comprising means for frequency modulating a carrier frequency with a band of noise, means coupling to said modulating means for transmitting said frequency modulated carrier signal in the direction of a target, receiving antenna means for receiving echos of said transmitted signal from said target means coupled to said transmitting meaNs and to said receiving antenna means for mixing a portion of said transmitted signal and a return echo signal from said target and producing an output signal comprising a band of coherent signals for in-range targets and a band of incoherent signals for out-of-range targets and means coupled to said mixing means for comparing the energy level of the coherent signals with the incoherent signals of said mixing means output whereby a firing signal is obtained only when the energy level of said coherent signals exceeds the energy level of said incoherent signals by a predetermined amount.
Claim 5
Dependent Claim
117 words
In a random FM autocorrelation fuze system wherein a noise modulated signal is transmitted and the receiver bandwidths are large to accommodate expected Doppler signals from a target, the improvement comprising means for mixing a return target echo with a portion of said transmitted signal and producing an output signal comprising a spectrum of coherent doppler wave portion plus an incoherent wave portion due to range noise coupled to said mixing means, for comparing the energy level of the coherent signals with the incoherent signals of said mixing means output whereby a firing signal is obtained only when the energy level of said coherent signals exceeds the energy level of said incoherent signals by a predetermined amount.
Claim 6
Dependent Claim
117 words
In a random FM autocorrelation fuze system wherein a noise modulated signal is transmitted and the receiver bandwidths are large to accommodate expected Doppler signals from a target, the improvement comprising means for mixing a return target echo with a portion of said transmitted signal and producing an output signal comprising a spectrum of coherent doppler wave portion plus an incoherent wave portion due to range noise coupled to said mixing means, for comparing the energy level of the coherent signals with the incoherent signals of said mixing means output whereby a firing signal is obtained only when the energy level of said coherent signals exceeds the energy level of said incoherent signals by a predetermined amount.
Claim 7
Dependent Claim
139 words
A radio fuze system responsive to in-range targets in the presence of large return signals from out-of-range reflectors comprising, means for transmitting a signal having its carrier frequency modulated by a band of white noise, receiving antenna means for receiving echoes of the transmitted signal means coupled to said said transmitting and receiving means for mixing a portion of said FM signal with a return echo signal modified by the relative movement between the fuze and a target and producing an output signal comprising coherent Doppler signals for in-range targets and incoherent range noise signals for out-of-range reflectors and means coupled to said mixing means for comparing the energy levels of said coherent and incoherent signals whereby a firing signal is derived only when said coherent signal energy level exceeds said incoherent signal energy level by a predetermined amount.
Claim 8
Dependent Claim
139 words
A radio fuze system responsive to in-range targets in the presence of large return signals from out-of-range reflectors comprising, means for transmitting a signal having its carrier frequency modulated by a band of white noise, receiving antenna means for receiving echoes of the transmitted signal means coupled to said said transmitting and receiving means for mixing a portion of said FM signal with a return echo signal modified by the relative movement between the fuze and a target and producing an output signal comprising coherent Doppler signals for in-range targets and incoherent range noise signals for out-of-range reflectors and means coupled to said mixing means for comparing the energy levels of said coherent and incoherent signals whereby a firing signal is derived only when said coherent signal energy level exceeds said incoherent signal energy level by a predetermined amount.
Claim 9
Dependent Claim
52 words
The fuze system of claim 4 in which said comparison means comprises means for detecting and integrating a band of said coherent signals and a band of said incoherent signals, and means coupled to said detecting and integrating means for comparing the envelopes of said integrated signals to derive said firing signal.
Claim 10
Dependent Claim
65 words
The fuze system of claim 5 in which said comparison means comprises means for amplifying said coherent and incoherent signals and frequency discriminator means coupled to said amplifying means for comparing the frequency band of said coherent signals with the frequency band of said incoherent signals to produce a firing signal when the band of coherent signals is greater than the band of incoherent signals.
References Cited (Backward Citations)
US2842764A
Cited
US2958862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |