US4245196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly-linear closed-loop frequency sweep generator
Assignee: United States Department of the Army
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Filing: 1979-07-30
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Granted: 1981-01-13
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Expires: 1999-07-30
Abstract
Abstract A method is presented for generating highly-linear periodic frequency sweeps by providing closed-loop linearity corrections for linear frequency sweeps that are error averaged over a number of sweeps. The technique can operate with a variable sweep period.
Inventors
- 👤 Peyton Z. Peebles, Jr.
- 👤 Augustus H. Green, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:47
CPC Classifications
H; H03; H03B; H03B23/00; H03B2200/00; H03B2200/006; H03B2200/0092
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
In a system for controlling the linearity of a voltage controlled oscillator whose output is to sweep periodically in a linear fashion between two frequency values, the improvement comprising the method of detecting errors in the sweep of the voltage controlled oscillator; averaging these errors over a plurality of sweeps; and sending the average of the errors back to the voltage controlled oscillator so as to correct its output.
Claim 2
Dependent Claim
69 words
In a system for controlling the linearity of a voltage controlled oscillator whose output is to sweep periodically in a linear fashion between two frequency values, the improvement comprising the method of detecting errors in the sweep of the voltage controlled oscillator; averaging these errors over a plurality of sweeps; and sending the average of the errors back to the voltage controlled oscillator so as to correct its output.
Claim 3
Dependent Claim
33 words
A method is set forth in claim 1 further comprising the steps of breaking down the errors into a plurality of coefficients; and summing these coefficients so as to obtain the average error.
Claim 4
Dependent Claim
20 words
A method is set forth in claim 2 further comprising the step of weighting the coefficients according to predetermined characteristics.
Claim 5
Dependent Claim
50 words
A method is set forth in claim 3 further comprising the steps of generating orthogonal basis function coefficients in accordance with the errors of the sweep of the voltage controlled oscillator; and combining these signals with the basis functions before summing them to send to control the voltage controlled oscillator.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |