US5043726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectral analyzer and direction indicator for laser guided aircraft landing system
Assignee: Raytheon Co
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Filing: 1985-05-23
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Granted: 1991-08-27
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Expires: 2005-05-23
Abstract
Abstract A spectral analyzer and direction indicator system (10) is disclosed and includes optical channels (20,30,40) for providing detected optical information indicative of incidence direction and spectral content of incident radiation. Each optical channel includes a reflector element (11,17,23) having a non-ruled section (11a, 17a, 23a) and a spectrally dispersing ruled section (11b, 17b, 23b); an analytical optical system (13,19,25); and a detector array (15,21,27). For each reflector element the non-ruled section is tilted in one or two directions relative to the ruled section. The disclosed spectral analyzer and direction indicator system is advantageously utilized as an aircraft based sensor in an aircraft landing system having ground based lasers (29L, 29R, 33L, 33R, 37L, 37R) directed into the landing approach path.
Inventors
- 👤 Gordon A. Shifrin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:35
CPC Classifications
G; G01; G01J; G01J9/00; B; B64; B64F; B64F1/00; B64F1/18; B64F1/20; G01S; G01S3/00; G01S3/78; G01S3/782; G01S3/783; G01S3/784; G01J3/00; G01J3/28; G01J3/2803
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
An aircraft landing system comprising: a plurality of laser sources in the proximity of a runway for radiating laser radiation indicative of the location of the runway, said laser radiation being radiated in a fixed non-scanning predetermined pattern with at least two simultaneously radiating sources; and sensing means carried by an aircraft for detecting in staring fashion the spectral content and incidence directions of the laser radiation radiated by said laser sources to provide azimuth, elevation, and range information indicative of aircraft position relative to the runway.
Claim 2
Dependent Claim
87 words
An aircraft landing system comprising: a plurality of laser sources in the proximity of a runway for radiating laser radiation indicative of the location of the runway, said laser radiation being radiated in a fixed non-scanning predetermined pattern with at least two simultaneously radiating sources; and sensing means carried by an aircraft for detecting in staring fashion the spectral content and incidence directions of the laser radiation radiated by said laser sources to provide azimuth, elevation, and range information indicative of aircraft position relative to the runway.
Claim 3
Dependent Claim
18 words
The aircraft landing system of claim 1 wherein said sensing means comprises a spectral analyzer and direction indicator.
Claim 4
Dependent Claim
20 words
The aircraft landing system of claim 1 wherein said radiating means comprises plurality of lasers selectively positioned adjacent the runway.
Claim 5
Dependent Claim
24 words
The aircraft landing system of claim 3 wherein said plurality of lasers includes a pair of lasers located on each side of the runway.
Claim 6
Dependent Claim
47 words
The aircraft landing system of claim 3 wherein said plurality of lasers includes a first pair of lasers located on each side of the runway nearer to an approaching aircraft, and a second pair of lasers on each side of the runway further from the approaching aircraft.
Claim 7
Dependent Claim
23 words
The aircraft landing system of claim 1 wherein said sensing means includes display means for visually displaying said azimuth, elevation and range information.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |