US3821737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratio fuze
Assignee: Individual
•
Filing: 1955-02-17
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Granted: 1974-06-28
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Expires: 1975-02-17
Abstract
Abstract 6. In an electronic ordnance fuze of the class wherein the signal returned from a target is mixed with a portion of the transmitted signal to obtain a mixer output signal the energy of which is peaked at a frequency substantially proportional to fuze-to-target distance, the improvement comprising: first and second networks having different but overlapping pass bands, the inputs of both of said networks being connected to the output of said mixer; and a firing circuit responsive to the attainment of a predetermined ratio between the respective outputs of said networks.
Inventors
- 👤 H Kalmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:31
CPC Classifications
F; F42; F42C; F42C13/00; F42C13/04; F42C13/045; G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/345
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
An electronic ordnance fuze comprising: a radio transmitter having a center frequency f1; means for frequency modulating said transmitter with a periodic signal having a repetition rate f2; means for radiating frequency-modulated energy from said transmitter; means for receiving a returned signal comprising a portion of said energy reflected from a target; mixer means for heterodyning said returned signal against a local frequency-modulated signal taken directly from said transmitter, the predominant frequencies in the output of said mixer being substantially proportional to fuze-to-target distance; first and second networks having different but overlapping pass bands, the inputs of both of said networks being connected to the output of said mixer, the output amplitude of said first network being adapted to decrease and the output amplitude of said second network being adapted to increase as the fuze-to-target distance decreases toward the value at which the fuze is designed to detonate; and a firing circuit responsive to the attainment of a predetermined ratio between the respective outputs of said first and second networks.
Claim 2
Dependent Claim
170 words
An electronic ordnance fuze comprising: a radio transmitter having a center frequency f1; means for frequency modulating said transmitter with a periodic signal having a repetition rate f2; means for radiating frequency-modulated energy from said transmitter; means for receiving a returned signal comprising a portion of said energy reflected from a target; mixer means for heterodyning said returned signal against a local frequency-modulated signal taken directly from said transmitter, the predominant frequencies in the output of said mixer being substantially proportional to fuze-to-target distance; first and second networks having different but overlapping pass bands, the inputs of both of said networks being connected to the output of said mixer, the output amplitude of said first network being adapted to decrease and the output amplitude of said second network being adapted to increase as the fuze-to-target distance decreases toward the value at which the fuze is designed to detonate; and a firing circuit responsive to the attainment of a predetermined ratio between the respective outputs of said first and second networks.
Claim 3
Dependent Claim
170 words
An electronic ordnance fuze comprising: a radio transmitter having a center frequency f1; means for frequency modulating said transmitter with a periodic signal having a repetition rate f2; means for radiating frequency-modulated energy from said transmitter; means for receiving a returned signal comprising a portion of said energy reflected from a target; mixer means for heterodyning said returned signal against a local frequencymodulated signal taken directly from said transmitter, the predominant frequencies in the output of said mixer being substantially proportional to fuze-to-target distance; first and second networks having different but overlapping pass bands, the inputs of both of said networks being connected to the output of said mixer, the output amplitude of said first network being adapted to decrease and the output amplitude of said second network being adapted to increase as the fuze-to-target distance decreases toward the value at which the fuze is designed to detonate; and a firing circuit responsive to the attainment of a predetermined ratio between the respective outputs of said first and second networks.
Claim 4
Dependent Claim
170 words
An electronic ordnance fuze comprising: a radio transmitter having a center frequency f1; means for frequency modulating said transmitter with a periodic signal having a repetition rate f2; means for radiating frequency-modulated energy from said transmitter; means for receiving a returned signal comprising a portion of said energy reflected from a target; mixer means for heterodyning said returned signal against a local frequencymodulated signal taken directly from said transmitter, the predominant frequencies in the output of said mixer being substantially proportional to fuze-to-target distance; first and second networks having different but overlapping pass bands, the inputs of both of said networks being connected to the output of said mixer, the output amplitude of said first network being adapted to decrease and the output amplitude of said second network being adapted to increase as the fuze-to-target distance decreases toward the value at which the fuze is designed to detonate; and a firing circuit responsive to the attainment of a predetermined ratio between the respective outputs of said first and second networks.
Claim 5
Dependent Claim
35 words
The invention according to claim 1, the cross-over frequency at which the outputs of said first and second networks become equal being at least 50,000 cycles, the effects of noise and microphonics thus being minimized.
Claim 6
Dependent Claim
39 words
The invention according to claim 1, the pass band of said first network being broader than the pass band of said second network, so that noise and microphonics will give a ''''no-target'''' indication at the output of said network.
Claim 7
Dependent Claim
25 words
The invention according to claim 1, said firing circuit being responsive to the attainment of equality between the outputs of said first and second networks.
Claim 8
Dependent Claim
26 words
The invention according to claim 1, said firing circuit being responsive to a change in polarity of the combined outputs of said first and second networks.
Claim 9
Dependent Claim
10 words
The invention according to claim 6, said ratio being 1-to-1.
Claim 10
Dependent Claim
15 words
The invention according to claim 7, said networks being resonant circuits peaked at different frequencies.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |