US3697988A
Expired / Lapsed
US
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Munition burst detection system and method
Assignee: United States Department of the Army
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Filing: 1971-01-20
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Granted: 1972-10-10
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Expires: 1991-01-20
Abstract
Abstract A munition burst detection system comprising: a Doppler or frequency shift detector; N frequency filters, said detector means comprising the input to said filters; N signal level detectors, said filters each respectively connected individually to one of said detectors; a pulse generating circuit providing (N-X)/2 sampling pulses, where X equals the number of fundamental burst frequency components, and X</=(N-2), said pulses occurring within the period of said munition burst; a burst detector, said burst detector means initiating the operation of said pulse generating circuit; (N-X)/2 NOR gates, the input to each successive NOR gate comprising the output of respective successive adjacent groups of two level detectors; (N-X)/2 NAND gates, the inputs of each respective NAND gate, except the last of said NAND gates, comprising (1) the outputs of each of said NOR gates, (2) the output of the second lowest frequency level detector, and (3) the sampling pulse corresponding in respective time sequence to the respective NAND gate into which each respective sampling pulse flows; and the input of the last of said NAND gates, constituting the output of the X lowest level detectors and the last occurring sampling pulse from said pulse generating circuit; (N-X)/2 flip-flops each respectively connected individually to one of said NAND gates; and an ACCEPT NAND gate, the inputs of said gate comprising the outputs of said flip-flops, said gate registering positively upon the detection of the proper Doppler frequencies in the munition burst.
Inventors
- 👤 Arnold Klausner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:01
CPC Classifications
F; F42; F42B; F42B35/00; G; G01; G01S; G01S13/00; G01S13/02; G01S13/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
274 words
A munition burst detection system for establishing the acceptability of said burst, comprising: A. a Doppler or frequency shift detection means; B. N frequency filters, said detection means comprising the input to said filters; C. N signal level detectors, said filters each respectively connected individually to one of said detectors; D. a pulse generating circuit providing (N-X)/2 sampling pulses, where X equals the number of fundamental burst frequency components, and X < OR = (N-2), said pulses occuring within the period of said munition burst; E. a burst detection means, said means initiating the operation of said pulse generating circuit; F. (N-X)/2 NOR gates, the input to each successive NOR gate comprising the output of respective successive adjacent groups of two level detectors; G. (N-X)/2 NAND gates, a. the inputs of each respective NAND gate, except the last of said NAND gates, comprising 1. the outputs of each of said NOR gates, 2. the output of the second lowest frequency level detector, and 3. the sampling pulse corresponding in respective time sequence to the respective NAND gate into which each respective sampling pulse flows; and b. the input of the last of said NAND gates constituting the output of the X lowest level detectors and the last occurring sampling pulse from said pulse generating circuit; and NAND gates registering positively upon the detection of the proper Doppler frequencies; H. (N-X)/2 flip-flops each respectively connected individually to one of said NAND gates; and I. an ACCEPT NAND gates, the inputs of said gate comprising the outputs of said flip-flops, said gate registering positively upon the detection of the proper Doppler frequencies in the munition burst.
Claim 2
Dependent Claim
274 words
A munition burst detection system for establishing the acceptability of said burst, comprising: A. a Doppler or frequency shift detection means; B. N frequency filters, said detection means comprising the input to said filters; C. N signal level detectors, said filters each respectively connected individually to one of said detectors; D. a pulse generating circuit providing (N-X)/2 sampling pulses, where X equals the number of fundamental burst frequency components, and X < OR = (N-2), said pulses occuring within the period of said munition burst; E. a burst detection means, said means initiating the operation of said pulse generating circuit; F. (N-X)/2 NOR gates, the input to each successive NOR gate comprising the output of respective successive adjacent groups of two level detectors; G. (N-X)/2 NAND gates, a. the inputs of each respective NAND gate, except the last of said NAND gates, comprising 1. the outputs of each of said NOR gates, 2. the output of the second lowest frequency level detector, and 3. the sampling pulse corresponding in respective time sequence to the respective NAND gate into which each respective sampling pulse flows; and b. the input of the last of said NAND gates constituting the output of the X lowest level detectors and the last occurring sampling pulse from said pulse generating circuit; and NAND gates registering positively upon the detection of the proper Doppler frequencies; H. (N-X)/2 flip-flops each respectively connected individually to one of said NAND gates; and I. an ACCEPT NAND gates, the inputs of said gate comprising the outputs of said flip-flops, said gate registering positively upon the detection of the proper Doppler frequencies in the munition burst.
Claim 3
Dependent Claim
10 words
the output of the second lowest frequency level detector, and
Claim 4
Dependent Claim
10 words
the output of the second lowest frequency level detector, and
Claim 5
Dependent Claim
146 words
A munition burst detective system comprising: A. radar means for receiving a Doppler shift signal resulting from a munition burst; B. a compression amplifier into which said Doppler signal is fed; C. about eight frequency filters, the input of said filters connected to the output of said compression amplifier; D. about eight signal level detectors, said filters each respectively connected individually to one of said detectors; E. a pulse generating circuit providing about three sampling pulses, said pulses occurring within the period of said munition burst; F. a burst detection means, said means initiating the operation of said pulse generating circuit; G. about three NOR gates, the input to each successive NOR comprising the output of a respective successive adjacent group of two level detectors; H. about three NAND gates, a. the inputs of each respective NAND gate, except the last of said NAND gates, comprising
Claim 6
Dependent Claim
146 words
A munition burst detective system comprising: A. radar means for receiving a Doppler shift signal resulting from a munition burst; B. a compression amplifier into which said Doppler signal is fed; C. about eight frequency filters, the input of said filters connected to the output of said compression amplifier; D. about eight signal level detectors, said filters each respectively connected individually to one of said detectors; E. a pulse generating circuit providing about three sampling pulses, said pulses occurring within the period of said munition burst; F. a burst detection means, said means initiating the operation of said pulse generating circuit; G. about three NOR gates, the input to each successive NOR comprising the output of a respective successive adjacent group of two level detectors; H. about three NAND gates, a. the inputs of each respective NAND gate, except the last of said NAND gates, comprising
Claim 7
Dependent Claim
10 words
the output of the second lowest frequency level detector, and
Claim 8
Dependent Claim
10 words
the output of the second lowest frequency level detector, and
Claim 9
Dependent Claim
98 words
the sampling pulse corresponding in respective time sequence to the respective NAND gate into which each respective sampling pulse flows; and b. the input of the last of said NAND gates constituting the output of the two lowest level detectors and the last occurring sampling pulse from said pulse generating circuit; I. about three flip-flops each respectively connected individually to one of said NAND gates; and J. an ACCEPT NAND gate, the inputs of said gate comprising the outputs of said flip-flops, said gate registering positively upon the detection of the proper Doppler frequencies in the munition burst.
Claim 10
Dependent Claim
98 words
the sampling pulse corresponding in respective time sequence to the respective NAND gate into which each respective sampling pulse flows; and b. the input of the last of said NAND gates constituting the output of the two lowest level detectors and the last occurring sampling pulse from said pulse generating circuit; I. about three flip-flops each respectively connected individually to one of said NAND gates; and J. an ACCEPT NAND gate, the inputs of said gate comprising the outputs of said flip-flops, said gate registering positively upon the detection of the proper Doppler frequencies in the munition burst.
Claim 11
Dependent Claim
33 words
The combination defined in claim 2 further including an ACCEPT light the input of which comprises the output of said ACCEPT NAND gate, said light affording a real-time visual indication of munition acceptability.
Claim 12
Dependent Claim
110 words
the sampling pulse corresponding in respective time sequence to the respective NAND gate into which each respective sampling pulse flows; and b. the input of the last of said NAND gates constituting the output of the X lowest level detectors and the last occurring sampling pulse from said pulse generating circuit; and NAND gates registering positively upon the detection of the proper Doppler frequencies; H. (N-X)/2 flip-flops each respectively connected individually to one of said NAND gates; and I. an ACCEPT NAND gates, the inputs of said gate comprising the outputs of said flip-flops, said gate registering positively upon the detection of the proper Doppler frequencies in the munition burst.
Claim 13
Dependent Claim
110 words
the sampling pulse corresponding in respective time sequence to the respective NAND gate into which each respective sampling pulse flows; and b. the input of the last of said NAND gates constituting the output of the X lowest level detectors and the last occurring sampling pulse from said pulse generating circuit; and NAND gates registering positively upon the detection of the proper Doppler frequencies; H. (N-X)/2 flip-flops each respectively connected individually to one of said NAND gates; and I. an ACCEPT NAND gates, the inputs of said gate comprising the outputs of said flip-flops, said gate registering positively upon the detection of the proper Doppler frequencies in the munition burst.
Claim 14
Dependent Claim
29 words
The combination defined in claim 2 further including a Doppler audio amplifier connectEd to the output of said compression amplifier, thus affording an audio monitor of the munition detonation.
Claim 15
Dependent Claim
26 words
The combination defined in claim 2 further including a munition impact detection means, said means comprising the output of the lowest of said signal level detectors.
Claim 16
Dependent Claim
34 words
The combination defined in claim 2 further including a display light connected to the output of each of said signal level detectors, said lights affording a real-time visual frequency analysis of the munition detonation.
Claim 17
Dependent Claim
37 words
The combination defined in claim 2 further including a Non-Accept NAND gate, and Non-Accept Light connected to the output of said Accept NAND gate so as to provide a visual indication of munition detonations which are unacceptable.
Claim 18
Dependent Claim
36 words
The combination defined in claim 7 wherein said Accept NAND gate has, for purposes of recording, a positive voltage level output and said Non-Accept NAND gate has, for purposes of recording, a negative voltage level output.
Claim 19
Independent Claim
142 words
The method of munition burst detection comprising A. receiving a Doppler return signal from the exploding munition; B. selectively frequency filtering of said signal by N filters; C. detecting the amplitude levels of the output of said filters; D. feeding the output of respective successive adjacent groups of two level detectors into (N-X)/2 NOR gates, where X is the number of fundamental burst frequency component and X < or = (N-2); E. feeding the output of said NOR gates into a like number of NAND gates; F. sequentially activating said NAND gates for discrete durations with sampling pulses produced by a pulse generating circuit, said pulses occurring within the period of the munition burst; G. storing the output of each of said NAND gates in flip-flops; and H. electronically registering the existence or absence of the proper combination of NAND gate outputs.
Claim 20
Independent Claim
142 words
The method of munition burst detection comprising A. receiving a Doppler return signal from the exploding munition; B. selectively frequency filtering of said signal by N filters; C. detecting the amplitude levels of the output of said filters; D. feeding the output of respective successive adjacent groups of two level detectors into (N-X)/2 NOR gates, where X is the number of fundamental burst frequency component and X < or = (N-2); E. feeding the output of said NOR gates into a like number of NAND gates; F. sequentially activating said NAND gates for discrete durations with sampling pulses produced by a pulse generating circuit, said pulses occurring within the period of the munition burst; G. storing the output of each of said NAND gates in flip-flops; and H. electronically registering the existence or absence of the proper combination of NAND gate outputs.
References Cited (Backward Citations)
US3614719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |