US3633204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distance-measuring equipment
Assignee: International Standard Electric Corp
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Filing: 1969-12-02
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Granted: 1972-01-04
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Expires: 1989-12-02
Abstract
Abstract The rhythmic spacing between two radiating antennas or the rhythmic spacing between two receiving antennas provide dopplershifted signals which when measured in a receiver provide a measure of distance between the transmitting and receiving antennas. In a preferred embodiment, a beacon radiates a first frequency from a stationary antenna and a second frequency sequentially from a linear array of stacked antennas. At a receiver the signals received by each of a spaced antenna pair are separately processed to extract therefrom a first and second doppler frequency. The difference between said first and second doppler frequencies provides a measure of the distance. In another preferred embodiment, a first and second frequency are respectively radiated from a spaced pair of antennas. A first antenna coupled to a receiver provides a first beat frequency. A linear array of antennas sequentially coupled to said receiver provides a doppler shifted second beat frequency. The difference between said beat frequencies provides a measure of distance.
Inventors
- 👤 Charles William Earp
- 👤 Francis Giles Overbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:12
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/02; G01S11/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A distance-measuring system comprising: means for generating a first frequency signal; antenna means for transmitting said first radiofrequency signal; means for generating a second radiofrequency signal; antenna means for transmitting said second radiofrequency signal; first antenna means for receiving said transmitted first and second radiofrequency signals; means for providing a first beat frequency coupled to said first antenna means; second antenna means for receiving said transmitted first and second radiofrequency signals; means for providing a second beat frequency coupled to said second antenna means; means associated with one of said antenna means for effectively doppler-shifting said second radiofrequency signal; and means for measuring the difference in frequency between said first and second beat frequencies.
Claim 2
Dependent Claim
114 words
A distance-measuring system comprising: means for generating a first frequency signal; antenna means for transmitting said first radiofrequency signal; means for generating a second radiofrequency signal; antenna means for transmitting said second radiofrequency signal; first antenna means for receiving said transmitted first and second radiofrequency signals; means for providing a first beat frequency coupled to said first antenna means; second antenna means for receiving said transmitted first and second radiofrequency signals; means for providing a second beat frequency coupled to said second antenna means; means associated with one of said antenna means for effectively doppler-shifting said second radiofrequency signal; and means for measuring the difference in frequency between said first and second beat frequencies.
Claim 3
Dependent Claim
74 words
A distance-measuring system, according to claim 1, wherein said means for transmitting said second frequency signal includes: an array of aerials; and wherein said means for effectively doppler-shifting said second frequency signal includes means for commutating said second frequency signal to the aerials of said array to provide a rhythmic variation of the spacing between said antenna means for transmitting said first radiofrequency signal and said antenna means for transmitting said second radiofrequency signal.
Claim 4
Dependent Claim
24 words
A distance-measuring system, according to claim 2, wherein said means for generating a first radiofrequency signal includes means for generating a first frequency-modulated signal.
Claim 5
Dependent Claim
43 words
A distance-measuring system, according to claim 3, wherein said means for generating a first frequency-modulated signal includes: a first frequency generator; a second frequency generator; and means for combining the outputs of said first and second frequency generators to provide a frequency-modulated signal.
Claim 6
Dependent Claim
24 words
A distance-measuring system, according to claim 2, wherein said means for generating said second radiofrequency signal includes means for generating a second frequency-modulated signal.
Claim 7
Dependent Claim
44 words
A distance-measuring system, according to claim 5, wherein said means for generating a second frequency-modulated signal includes: a first RF generator; a second RF generator; and means for combining the outputs of said first and second RF generators to provide a second frequency-modulated signal.
Claim 8
Dependent Claim
24 words
A distance-measuring system, according to claim 5, wherein said means for generating a first radiofrequency signal includes means for generating a first frequency-modulated signal.
Claim 9
Dependent Claim
58 words
A distance-measuring system, according to claim 1, wherein said second antenna means comprises an array of aerials and wherein said means for effectively doppler-shifting said second frequency signal includes commutating means coupling said array aerials to said means for providing a first beat frequency to provide rhythmic variation of the spacing between said first and second antenna means.
Claim 10
Dependent Claim
48 words
A distance-measuring system, according to claim 8, wherein said first antenna means comprises a second array of aerials and wherein said means for effectively doppler-shifting said second frequency signal further includes commutating means coupling said second array of aerials to said means for providing a second beat frequency.
References Cited (Backward Citations)
US3098225A
Cited
US3366957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |