US4015260A
Expired / Lapsed
US
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Digital MTI radar
Assignee: Raytheon Co
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Filing: 1970-11-02
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Granted: 1977-03-29
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Expires: 1990-11-02
Abstract
Abstract A digital MTI radar wherein, after an initial period, differences between the composite video signal of a present range sweep and a prediction of the composite video signal of such range sweep are digitized by an analog-to-digital converter.
Inventors
- 👤 Ronald B. Campbell, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:04
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
In an MTI radar system wherein an analog difference signal, such signal corresponding to the difference between a composite video signal during a range sweep and a predicted video signal for such range sweep, is digitized to form a corresponding digital difference signal, the improvement comprising: a. predictor means, responsive to a digital input signal, for producing a predicted digital signal; b. a digital-to-analog converter, responsive to the predicted digital signal, for producing the predicted video signal; c. a differencing network, responsive to the predicted video signal and the composite video signal, for forming an analog difference signal; and, d. an analog-to-digital converter, responsive to the analog difference signal, for forming said digital input signal.
Claim 2
Dependent Claim
115 words
In an MTI radar system wherein an analog difference signal, such signal corresponding to the difference between a composite video signal during a range sweep and a predicted video signal for such range sweep, is digitized to form a corresponding digital difference signal, the improvement comprising: a. predictor means, responsive to a digital input signal, for producing a predicted digital signal; b. a digital-to-analog converter, responsive to the predicted digital signal, for producing the predicted video signal; c. a differencing network, responsive to the predicted video signal and the composite video signal, for forming an analog difference signal; and, d. an analog-to-digital converter, responsive to the analog difference signal, for forming said digital input signal.
Claim 3
Dependent Claim
74 words
In an MTI radar system wherein an analog difference signal, such signal corresponding to the difference between a composite video signal during a range sweep and a predicted video signal for such range sweep, is digitized to form a corresponding digital difference signal, the improvement as recited in claim 1, wherein the predicted digital signal produced by the predictor means is a digital signal representing the composite video signal during the preceding range sweep.
Claim 4
Dependent Claim
94 words
In an MTI radar system wherein an analog difference signal, such signal corresponding to the difference between a composite video signal during a range sweep and a predicted video signal for such range sweep, is digitized to form a corresponding digital difference signal, the improvement as recited in claim 1, wherein the predicted digital signal produced by the predictor means is a digital signal representing the difference between twice the composite video signal during the immediately preceding range sweep and the composite video signal during the range sweep prior to such preceding range sweep.
Claim 5
Dependent Claim
79 words
In an MTI radar system wherein an analog difference signal, such signal corresponding to the difference between a composite video signal during a range sweep and a predicted video signal for such range sweep, is digitized to form a corresponding digital difference signal, the improvement as recited in claim 1, including utilization means to observe the analog difference signal; and means, operative in accordance with the utilization means, for varying the predicted digital signal produced by the predictor means.
Claim 6
Dependent Claim
128 words
In an MTI radar system, the combination comprising: a. differencing means for producing an analog difference signal corresponding to the difference between a composite video signal produced during a range sweep and an analog signal representative of a prediction of such composite video signal; b. an analog-to-digital converter for digitizing such analog difference signal; c. predicter means, responsive to the digital signal produced by the analog-to-digital converter, for producing a digital signal representative of a prediction of the composite video signal for a succeeding range sweep; and d. a digital-to-analog converter for converting the digital signal produced by the predictor means into the analog signal, such analog signal being the analog signal representative of a prediction of the composite video signal which is coupled to the differencing means.
Claim 7
Dependent Claim
128 words
In an MTI radar system, the combination comprising: a. differencing means for producing an analog difference signal corresponding to the difference between a composite video signal produced during a range sweep and an analog signal representative of a prediction of such composite video signal; b. an analog-to-digital converter for digitizing such analog difference signal; c. predicter means, responsive to the digital signal produced by the analog-to-digital converter, for producing a digital signal representative of a prediction of the composite video signal for a succeeding range sweep; and d. a digital-to-analog converter for converting the digital signal produced by the predictor means into the analog signal, such analog signal being the analog signal representative of a prediction of the composite video signal which is coupled to the differencing means.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |