Patent US4053892A successfully refreshed from Google Patents.
US4053892A
Expired / Lapsed
US
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System for enabling coherent signal processing at a remote receiving station
Assignee: International Standard Electric Corp
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Filing: 1976-03-01
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Granted: 1977-10-11
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Expires: 1996-03-01
Abstract
Abstract A system involving a mechanically or electronically scanned beam of electromagnetic energy and separate antenna means for transmitting a phase reference signal. A remote receiving station, such as on-board an aircraft on landing approach, is able to process received signals coherently to take advantage of the increased accuracy available in such processing.
Inventors
- 👤 Charles W. Earp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:59
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
218 words
In a microwave landing system of the scanning beam type in which a remote receiving station derives angular navigational information from the transmissions of a ground beacon by processing signals received from said beacon, the combination comprising: a scanning antenna within said ground beacon, all the radiating elements of which are contemporaneously excited for sweeping a collimated beam through a predetermined angular sector of space; first means for generating a first radio frequency signal to energize said scanning antenna; second means responsive to said first radio frequency signal for generating a second radio frequency signal therefrom, said second means being responsive to said first radio frequency signal for generating said second radio frequency with a predetermined phase relationship with said first radio frequency signal but offset therefrom in frequency, said second radio frequency signal being substantially continuous during transmission of said first radio frequency signal, and substantially independent of the transmissions and angular position of said scanning antenna; and a nonscanning second antenna arranged to provide radiation coverage at least over said sector swept by said scanning antenna, said second antenna being energized by said second radio frequency signal, said second radio frequency signal thereby providing a reference signal at said remote receiving station for coherent processing of said first radio frequency signal received at said remote station.
Claim 2
Dependent Claim
218 words
In a microwave landing system of the scanning beam type in which a remote receiving station derives angular navigational information from the transmissions of a ground beacon by processing signals received from said beacon, the combination comprising: a scanning antenna within said ground beacon, all the radiating elements of which are contemporaneously excited for sweeping a collimated beam through a predetermined angular sector of space; first means for generating a first radio frequency signal to energize said scanning antenna; second means responsive to said first radio frequency signal for generating a second radio frequency signal therefrom, said second means being responsive to said first radio frequency signal for generating said second radio frequency with a predetermined phase relationship with said first radio frequency signal but offset therefrom in frequency, said second radio frequency signal being substantially continuous during transmission of said first radio frequency signal, and substantially independent of the transmissions and angular position of said scanning antenna; and a nonscanning second antenna arranged to provide radiation coverage at least over said sector swept by said scanning antenna, said second antenna being energized by said second radio frequency signal, said second radio frequency signal thereby providing a reference signal at said remote receiving station for coherent processing of said first radio frequency signal received at said remote station.
Claim 3
Dependent Claim
19 words
A system according to claim 1 in which said scanning antenna comprises a mechanically scanned reflector and feed arrangement.
Claim 4
Dependent Claim
38 words
A system according to claim 1 in which said scanning antenna comprises an electronically scanned array for providing inertialess scanning by a technique selected from a group including frequency scanning and controlled-phase feed to provide a scanning array.
Claim 5
Dependent Claim
16 words
A system according to claim 3 in which said scanning antenna comprises a phased array scanner.
Claim 6
Dependent Claim
24 words
Apparatus according to claim 2 in which said second antenna is defined as being sited at a fixed position adjacent to said scanning antenna.
Claim 7
Dependent Claim
24 words
Apparatus according to claim 3 in which said second antenna is defined as being sited at a fixed position adjacent to said scanning antenna.
Claim 8
Dependent Claim
39 words
Apparatus according to claim 3 in which said array comprises a plurality of radiating elements, at least one of which is electrically spearate from said first radio frequency signal energization and is energized by said second radio frequency signal.
Claim 9
Dependent Claim
39 words
Apparatus according to claim 4 in which said array comprises a plurality of radiating elements, at least one of which is electrically separate from said first radio frequency signal energization and is energized by said second radio frequency signal.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |