US3787849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airborne digital moving target detector
Assignee: United States Department of the Air Force
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Filing: 1972-11-07
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Granted: 1974-01-22
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Expires: 1992-11-07
Abstract
Abstract A digital moving target detector in which the transmitter feeds a Butler matrix connecting a series of antennas. On reception the received signals are fed to a sample and store circuit, fed to a series of scaling multipliers, and then summed in N groups with each group including samples corresponding to range bins. The groups are stored at every pulse and then multiplied with a digital reference waveform and summed. Also the received signals can be converted to a Fourier Transform by an FFT algorithm, multiplied by correlation complex numbers in sequence and then added to corresponding products of corresponding sequences, the inverse Fourier Transform thereof represents radar outputs.
Inventors
- 👤 C Sletten
- 👤 W Goggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:32
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/53
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
122 words
A digital airborne moving target detection system comprising: a. a radar transmitter; b. a plurality of radiating elements; c. means for connecting the plurality of radiating elements to the radar transmitter in a preselected pattern; and d. a digital correlator including, 1. a sampling and storing circuit fed by the plurality of radiating elements, 2. a first series of multiplying and summing circuits equal to the number of radiating elements, fed by the sampling and summing circuit, 3. a plurality of storing means, fed by one each of the first series of multiplying and summing circuits; and 4. a second series of multiplying and summing circuits fed by one each of the plurality of storing means and coefficients of a sequence waveform.
Claim 2
Dependent Claim
122 words
A digital airborne moving target detection system comprising: a. a radar transmitter; b. a plurality of radiating elements; c. means for connecting the plurality of radiating elements to the radar transmitter in a preselected pattern; and d. a digital correlator including, 1. a sampling and storing circuit fed by the plurality of radiating elements, 2. a first series of multiplying and summing circuits equal to the number of radiating elements, fed by the sampling and summing circuit, 3. a plurality of storing means, fed by one each of the first series of multiplying and summing circuits; and 4. a second series of multiplying and summing circuits fed by one each of the plurality of storing means and coefficients of a sequence waveform.
Claim 3
Dependent Claim
22 words
a first series of multiplying and summing circuits equal to the number of radiating elements, fed by the sampling and summing circuit,
Claim 4
Dependent Claim
22 words
a first series of multiplying and summing circuits equal to the number of radiating elements, fed by the sampling and summing circuit,
Claim 5
Dependent Claim
25 words
a plurality of means for performing Fast Fourier Transforms fed by one each of the sampling and storing circuits and having a plurality of outputs.
Claim 6
Dependent Claim
25 words
a plurality of means for performing Fast Fourier Transforms fed by one each of the sampling and storing circuits and having a plurality of outputs.
Claim 7
Dependent Claim
58 words
A digital airborne moving target detection system according to claim 1 wherein the connecting means comprises: a. a Butler matrix having a plurality of inputs and a plurality of outputs being fed to one each of the plurality of radiating elements; and b. means for selectively switching the transmitter to the plurality of inputs of the Butler matrix.
Claim 8
Dependent Claim
41 words
A digital airborne moving target detection system comprising: a. a radar transmitter; b. a plurality of radiating elements; c. means for connecting the plurality of radiating elements to the radar transmitter in a preselected pattern; and d. a digital correlator including,
Claim 9
Dependent Claim
41 words
A digital airborne moving target detection system comprising: a. a radar transmitter; b. a plurality of radiating elements; c. means for connecting the plurality of radiating elements to the radar transmitter in a preselected pattern; and d. a digital correlator including,
Claim 10
Dependent Claim
49 words
a plurality of series of multipliers, one each of the plurality being fed by one each of the Fast Fourier Transform means with each of the series being fed by every output of the corresponding Fast Fourier Transform means and fed by Fourier Transforms of coefficients of reference waveforms,
Claim 11
Dependent Claim
49 words
a plurality of series of multipliers, one each of the plurality being fed by one each of the Fast Fourier Transform means with each of the series being fed by every output of the corresponding Fast Fourier Transform means and fed by Fourier Transforms of coefficients of reference waveforms,
Claim 12
Dependent Claim
19 words
a plurality of storing means, fed by one each of the first series of multiplying and summing circuits; and
Claim 13
Dependent Claim
19 words
a plurality of storing means, fed by one each of the first series of multiplying and summing circuits; and
Claim 14
Dependent Claim
22 words
a plurality of series of summers with each summer being fed by corresponding multipliers of each of the series of multipliers, and
Claim 15
Dependent Claim
22 words
a plurality of series of summers with each summer being fed by corresponding multipliers of each of the series of multipliers, and
Claim 16
Dependent Claim
58 words
A digital airborne moving target detection system according to claim 3 wherein the connecting means comprises: a. A Butler matrix having a plurality of inputs and a plurality of outputs being fed to one each of the plurality of radiating elements; and b. means for selectively switching the transmitter to the plurality of inputs of the Butler matrix.
Claim 17
Dependent Claim
24 words
a second series of multiplying and summing circuits fed by one each of the plurality of storing means and coefficients of a sequence waveform.
Claim 18
Dependent Claim
24 words
a second series of multiplying and summing circuits fed by one each of the plurality of storing means and coefficients of a sequence waveform.
Claim 19
Dependent Claim
21 words
a plurality of means for performing inverse Fast Fourier Transform fed by one each of the plurality of series of summers.
Claim 20
Dependent Claim
21 words
a plurality of means for performing inverse Fast Fourier Transform fed by one each of the plurality of series of summers.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |