US3670337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation beacon utilizing a commutator which supplies radio frequency in succession to several aerials
Assignee: International Standard Electric Corp
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Filing: 1970-01-21
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Granted: 1972-06-13
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Expires: 1990-01-21
Abstract
Abstract A radio navigation beacon is provided having a linear array of equally spaced aerials and means which commutate radio-frequency to each said aerial in succession so as to produce bi-directional constant-velocity scanning of the array. Further means including an aerial for radiating radio-frequency energy of a frequency which differs by a fixed amount from the radio frequency which is commutated to the array. The sign of frequency difference is changed at each half period of commutation to the array.
Inventors
- 👤 Charles William Earp
- 👤 Francis Giles Overbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:58
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/38; G01S1/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A radio navigation beacon including a linear array of equally spaced aerials, means for commutating radio frequency energy to each said aerial in succession so as to produce bi-directional constant velocity scanning of the array, means including a further aerial for radiating radio-frequency energy of a frequency which differs by a fixed amount from the radiofrequency which is commutated to the array, and means for changing the commutated radio-frequency and the frequency of the signal radiated by said further aerial such that the frequency difference is positive during one half period of commutation to the array and negative during the other half period of commutation to the array.
Claim 2
Dependent Claim
108 words
A radio navigation beacon including a linear array of equally spaced aerials, means for commutating radio frequency energy to each said aerial in succession so as to produce bi-directional constant velocity scanning of the array, means including a further aerial for radiating radio-frequency energy of a frequency which differs by a fixed amount from the radiofrequency which is commutated to the array, and means for changing the commutated radio-frequency and the frequency of the signal radiated by said further aerial such that the frequency difference is positive during one half period of commutation to the array and negative during the other half period of commutation to the array.
Claim 3
Dependent Claim
24 words
A radio navigation beacon as claimed in claim 1 in which said frequency difference is an integral multiple of the aerial scanning commutation rate.
Claim 4
Dependent Claim
37 words
A radio navigation beacon as claimed in claim 1 in which the commutated radio-frequency is constant and the frequency radiated by said further aerial is changed by twice said fixed amount at each half period of commutation.
Claim 5
Dependent Claim
37 words
A radio navigation beacon as claimed in claim 1 in which the frequency radiated by said further aerial is constant and the commutated radio-frequency is changed by twice said fixed amount at each half period of commutation.
Claim 6
Dependent Claim
30 words
A radio navigation beacon as claimed in claim 1 in which the commutated radio-frequency and the frequency radiated by said further aerial are interchanged at each half period of commutation.
Claim 7
Dependent Claim
59 words
A radio navigation beacon as claimed in claim 5 including means for causing a phase change of the commutated radio-frequency energy between each successive bi-directional scan of the array, and in which successive phase changes are of equal magnitude and in the same direction, so that the same phase relation repeats at intervals of a number of said scans.
Claim 8
Dependent Claim
31 words
A radio navigation beacon as claimed in claim 5 in which there is an equal period of radiation of the commutated radio-frequency energy from each of the aerials of the array.
Claim 9
Dependent Claim
15 words
A radio navigation beacon as claimed in claim 1 in which the array is vertical.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |