Patent US3665469A successfully refreshed from Google Patents.
US3665469A
Expired / Lapsed
US
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Apparatus for improving the lane resolution capabilities of omega navigation receivers
Assignee: United States Department of the Navy
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Filing: 1970-02-27
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Granted: 1972-05-23
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Expires: 1990-02-27
Abstract
Abstract The invention consists of a system to improve the lane resolution of Omega Navigation Receivers. By measuring the average phase offset of the 3.4 kHz signal from the 10.2 kHz signal due to propagation variations, the offset can be added to the 3.4 kHz phase measurement to provide spatial coincidence of the 10.2 and 13.6 kHz lanes and thus provide better lane resolution of the 10.2 kHz lane.
Inventors
- 👤 Melvin F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:18
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01S1/308
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A radio navigation system for eliminating phase offset between two received signals due to environmental conditions comprising: receiving means to receive predetermined signals; a first signal and a second signal; means for multiplying said first signal whereby it has the same frequency as said second signal; differential means for indicating the phase difference between said multiplied first signal and said second signal; averaging and storing means connected to said differential means for calculating and storing the average phase difference indicated by said differential means; and means connected to said storing means for varying the phase of said unmultiplied first signal by said stored phase difference signal whereby said first signal and second signal are in phase.
Claim 2
Dependent Claim
116 words
A radio navigation system for eliminating phase offset between two received signals due to environmental conditions comprising: receiving means to receive predetermined signals; a first signal and a second signal; means for multiplying said first signal whereby it has the same frequency as said second signal; differential means for indicating the phase difference between said multiplied first signal and said second signal; averaging and storing means connected to said differential means for calculating and storing the average phase difference indicated by said differential means; and means connected to said storing means for varying the phase of said unmultiplied first signal by said stored phase difference signal whereby said first signal and second signal are in phase.
Claim 3
Dependent Claim
23 words
A system as recited in claim 1 including means for deriving said first signal by subtracting a third signal from said second signal.
Claim 4
Dependent Claim
29 words
A system as recited in claim 2, including phase shiftErs between said receiving means and said deriving means for inserting diurnal phase corrections to said second and third signals.
Claim 5
Dependent Claim
36 words
A system as recited in claim 3, wherein said first signal is 3,400 Hz, said second signal is 10,200 Hz, said third signal is 11,333 Hz, said three signals being included in the Omega navigation system.
References Cited (Backward Citations)
US3564425A
Cited
US3493971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |