Patent US3906499A successfully refreshed from Google Patents.
US3906499A
Expired / Lapsed
US
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Scanner projector system
Assignee: United States Department of the Army
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Filing: 1974-05-22
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Granted: 1975-09-16
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Expires: 1994-05-22
Abstract
Abstract A scanner projector system for simulating land, weather, chaff clouds, or other background conditions surrounding a target to a radar system is described. The projector system includes a laser beam generator having an external feedback loop and a traveling wave scanner for deflecting a portion of said laser beam through a recorded scenario film including a density pattern corresponding to the background conditions surrounding at target. The traveling wave scanner simulates the manner in which an actual radar beam scans a test scenario while the scenario film simulates the reflectivity of the background conditions.
Inventors
- 👤 Charles M Redman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:32
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/54; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S7/4082
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
A scanner projector system for simulating to a radar system background conditions of a test scenario comprising in combination: a. means for generating a laser beam; b. travelling wave scanner means; c. means for directing said laser beam through said travelling wave scanner means; d. means for transmitting a radar signal through said travelling wave scanner in a direction transverse to said laser beam, said radar signal selectively deflecting a portion of said laser beam; e. means for directing said deflected portion of said laser beam along a predetermined path; and f. scenario film means disposed in said predetermined path, said scenario film comprising a recorded variable density representation of the background conditions of said test scenario; whereby said travelling wave scanner simulates the manner in which an actual radar signal scans said test scenario and said scenario film simulates the reflectivity of the background in said test scenario.
Claim 2
Dependent Claim
149 words
A scanner projector system for simulating to a radar system background conditions of a test scenario comprising in combination: a. means for generating a laser beam; b. travelling wave scanner means; c. means for directing said laser beam through said travelling wave scanner means; d. means for transmitting a radar signal through said travelling wave scanner in a direction transverse to said laser beam, said radar signal selectively deflecting a portion of said laser beam; e. means for directing said deflected portion of said laser beam along a predetermined path; and f. scenario film means disposed in said predetermined path, said scenario film comprising a recorded variable density representation of the background conditions of said test scenario; whereby said travelling wave scanner simulates the manner in which an actual radar signal scans said test scenario and said scenario film simulates the reflectivity of the background in said test scenario.
Claim 3
Dependent Claim
39 words
The projector system of claim 1 wherein said means for generating a laser beam comprises a source of laser radiation and an external feedback loop through said traveling wave scanner and back to said source to sustain laser action.
Claim 4
Dependent Claim
37 words
The projector system of claim 1 wherein said traveling wave scanner comprises a crystal means which normally transmits optical radiation without deflection but which permits the deflection of said optical radiation by an acoustic traveling wave therein.
Claim 5
Dependent Claim
24 words
The projector system of claim 3 wherein said radar signal is an acoustic signal and said laser beam includes radiation in the infrared range.
Claim 6
Dependent Claim
39 words
The projector system of claim 1 wherein said means for directing said laser beam through said travelling wave scanner comprises means for fanning out said beam and means for collimating said fanned out beam into an elongated narrow beam.
Claim 7
Dependent Claim
15 words
The projector system of claim 5 wherein said collimating means comprises a first parabolic reflector.
Claim 8
Dependent Claim
29 words
The projector system of claim 1 wherein means are provided in the path of said deflected radiation for collimating said radiation before said radiation passes through said scenario film.
Claim 9
Dependent Claim
31 words
The projector system of claim 7 wherein beam expander means is provided in said deflected beam path for fanning out said collimated radiation before said radiation passes through said scenario film.
Claim 10
Dependent Claim
41 words
The projector system of claim 1 wherein said radar signal wobbles from a low to high frequency causing the angle of deflection of said deflected radiation to vary and means are provided for correcting for the wobble of said radar signal.
Claim 11
Dependent Claim
27 words
The projector system of claim 9 wherein said correcting means comprises fiber optical means disposed in the deflected beam path for properly aligning said deflected radiation beams.
Claim 12
Dependent Claim
27 words
The projector system of claim 1 wherein said means for directing said deflected portion of said laser beam along a predetermined path comprises a second parabolic reflector.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |