US3634862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision approach and landing system
Assignee: Westinghouse Electric Corp
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Filing: 1969-05-19
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Granted: 1972-01-11
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Expires: 1989-05-19
Abstract
Abstract A precision approach and landing system (PAALS) utilizing phase interferometers disposed perpendicular to each other and each including two antenna elements separated by a predetermined distance. Carrier signals are radiated from the antennas in timed sequence to allow separation of the signals emitted from the various ground antenna elements. The use of timed signals allows simpler hardware and more accurate implementation than heretofore available.
Inventors
- 👤 Harold C Hiscox
- 👤 Larry R Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:22
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S1/00; G01S1/02; G01S1/08; G01S1/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
A precision approach and landing system comprising, in combination: phase interferometer means including spaced apart antennas; means for radiating a first carrier signal from one of said antennas and a second carrier signal from the other of said antennas; means for delaying said second carrier from said first carrier signal; receiver means responsive to the difference in phase of the received carrier signals for locating a position disposed from saId interferometer means.
Claim 2
Dependent Claim
72 words
A precision approach and landing system comprising, in combination: phase interferometer means including spaced apart antennas; means for radiating a first carrier signal from one of said antennas and a second carrier signal from the other of said antennas; means for delaying said second carrier from said first carrier signal; receiver means responsive to the difference in phase of the received carrier signals for locating a position disposed from saId interferometer means.
Claim 3
Dependent Claim
31 words
The combination of claim 1 including means for providing a second reference signal following said carrier signals, said second reference signal together with said preceding reference signal bracketing said carrier signals.
Claim 4
Dependent Claim
74 words
A precision approach and landing system comprising, in combination: phase interferometer means including a glide slope interferometer and a localizer interferometer each including at least two point antennas; means for radiating a pair of carrier signals from said glide slope interferometer which are displaced in time; and means for radiating a pair of carrier signals from said localizer interferometer which are displaced in time from each other and said other pair of carrier signals.
Claim 5
Dependent Claim
74 words
A precision approach and landing system comprising, in combination: phase interferometer means including a glide slope interferometer and a localizer interferometer each including at least two point antennas; means for radiating a pair of carrier signals from said glide slope interferometer which are displaced in time; and means for radiating a pair of carrier signals from said localizer interferometer which are displaced in time from each other and said other pair of carrier signals.
Claim 6
Dependent Claim
19 words
The combination of claim 3 including means for preceding said respective pairs of carrier signals by a reference pulse.
Claim 7
Dependent Claim
19 words
The combination of claim 4 including means for following said respective pairs of carrier signals by a reference pulse.
Claim 8
Dependent Claim
38 words
The combination of claim 4 including receiver means for detecting the phase difference between said first pair of carrier signals to determine the angle of elevation of said receiver means from the location of said glide slope interferometer.
Claim 9
Dependent Claim
20 words
The combination of claim 3 including receiver means for detecting the phase difference between each pair of said carrier signals.
Claim 10
Dependent Claim
43 words
The combination of claim 7 wherein said receiver means includes delay means for coinciding in point of time each of said signals comprising said first pair and coinciding in point of time each of the signals of said second pair of carrier signals.
Claim 11
Dependent Claim
14 words
The combination of claim 8 wherein said delay means is a narrow band filter.
Claim 12
Dependent Claim
21 words
The combination of claim 9 wherein said narrow band filter has a bandwidth of 1/20th or less than the carrier bandwidth.
Claim 13
Dependent Claim
22 words
The combination of claim 10 wherein said narrow band filter provides an impulse signal which rings in phase with the carrier signal.
Claim 14
Dependent Claim
52 words
The combination of claim 7 wherein said receiver means includes variable phase shifter means for each pair of carrier signals to bias for a desired course and phase detector means for comparing said phase difference with the bias phase to obtain an error signal proportional to the deviation from the desired course.
References Cited (Backward Citations)
US3351941A
Cited
US3115634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |