US3913104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incoherent spectral comparison fuze system with hybrid agc
Assignee: United States Department of the Navy
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Filing: 1959-02-17
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Granted: 1975-10-14
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Expires: 1979-02-17
Abstract
Abstract 2. An FM fuze system comprising a source of band limited noise, an RF transmitter coupled to a source of band limited noise for transmitting a random noise modulated signal in the direction of a target, receiving means for receiving a return echo of said transmitted signal, a mixer circuit having a first and second input coupled to said transmitter and to said receiving means for producing an output signal containing coherent and incoherent signals, first amplifier intergrator circuit means coupled to said mixer circuit means for accepting a first band of frequencies within said incoherent portion of said mixer output signal and producing an output voltage proportional to the average amplitude of said first band of frequencies, second amplifier intergrator circuit means coupled to said mixer circuit for accepting a second band of frequencies within said incoherent portion of said mixer output signal and producing an output voltage proportional to the average amplitude of said second band of frequencies, difference amplifier means coupled to said first and second circuit means for producing an output signal proportional to the difference of the amplitudes of the output signals of said first and second amplifier integrator circuits.
Inventors
- 👤 Donald J Adrian
- 👤 Carlton H Cash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:06
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/346
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A noise modulated FM fuze system comprising means for transmitting a signal frequency modulated by band limited noise, receiving means for receiving a return echo of said transmitted signal from a target, mixing means coupled to said transmitting and receiving means for producing an output signal which comprises bands of incoherent signals having different energy levels, first circuit means coupled to said mixer means for producing an output signal proportional to the energy level of a first of said band of incoherent signals, second circuit means coupled to said mixer means for producing an output signal proportional to the energy level of a second of said band of incoherent signals, and a difference amplifier coupled to said first and second circuit means for producing an output signal for activating the firing circuit of said fuze system when the difference in amplitudes of the outputs of said first and second circuit means is positive and of a predetermined amplitude.
Claim 2
Dependent Claim
158 words
A noise modulated FM fuze system comprising means for transmitting a signal frequency modulated by band limited noise, receiving means for receiving a return echo of said transmitted signal from a target, mixing means coupled to said transmitting and receiving means for producing an output signal which comprises bands of incoherent signals having different energy levels, first circuit means coupled to said mixer means for producing an output signal proportional to the energy level of a first of said band of incoherent signals, second circuit means coupled to said mixer means for producing an output signal proportional to the energy level of a second of said band of incoherent signals, and a difference amplifier coupled to said first and second circuit means for producing an output signal for activating the firing circuit of said fuze system when the difference in amplitudes of the outputs of said first and second circuit means is positive and of a predetermined amplitude.
Claim 3
Dependent Claim
194 words
An FM fuze system comprising a source of band limited noise, an RF transmitter coupled to a source of band limited noise for transmitting a random noise modulated signal in the direction of a target, receiving means for receiving a return echo of said transmitted signal, a mixer circuit having a first and second input coupled to said transmitter and to said receiving means for producing an output signal containing coherent and incoherent signals, first amplifier intergrator circuit means coupled to said mixer circuit means for accepting a first band of frequencies within said incoherent portion of said mixer output signal and producing an output voltage proportional to the average amplitude of said first band of frequencies, second amplifier intergrator circuit means coupled to said mixer circuit for accepting a second band of frequencies within said incoherent portion of said mixer output signal and producing an output voltage proportional to the average amplitude of said second band of frequencies, difference amplifier means coupled to said first and second circuit means for producing an output signal proportional to the difference of the amplitudes of the output signals of said first and second amplifier integrator circuits.
Claim 4
Dependent Claim
194 words
An FM fuze system comprising a source of band limited noise, an RF transmitter coupled to a source of band limited noise for transmitting a random noise modulated signal in the direction of a target, receiving means for receiving a return echo of said transmitted signal, a mixer circuit having a first and second input coupled to said transmitter and to said receiving means for producing an output signal containing coherent and incoherent signals, first amplifier intergrator circuit means coupled to said mixer circuit means for accepting a first band of frequencies within said incoherent portion of said mixer output signal and producing an output voltage proportional to the average amplitude of said first band of frequencies, second amplifier intergrator circuit means coupled to said mixer circuit for accepting a second band of frequencies within said incoherent portion of said mixer output signal and producing an output voltage proportional to the average amplitude of said second band of frequencies, difference amplifier means coupled to said first and second circuit means for producing an output signal proportional to the difference of the amplitudes of the output signals of said first and second amplifier integrator circuits.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |