US4713667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Target support apparatus
Assignee: United States Department of the Air Force
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Filing: 1987-03-26
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Granted: 1987-12-15
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Expires: 2007-03-26
Abstract
Abstract Target support structure for making bistatic radar cross section measurements. The support structure includes two parallel columns of circular cross section that may be coated with radar absorbing material. The rotational angle of the columns and the spacing therebetween are each adjustable to allow the bistatic reflections from each column to be phased to cancel each other at a selected bistatic angle and thereby minimize the background signal from the support structure.
Inventors
- 👤 J. Leon Poirier
- 👤 Robert V. McGahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:53
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/003; G01S7/00; G01S7/02; G01S7/41; G01S7/411
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
Apparatus for supporting a target undergoing radar measurements comprising: a base assembly; azimuthal positioner means coupled to said base assembly for rotating said base assembly in an azimuthal plane; a first and a second column being parallel and attached perpendicular to said base assembly; column separation adjusting means for adjusting the spacing between said first column and said second column; target attitude positioning means affixed to the distal end of said first column; and means for affixing a target to said target attitude positioning means.
Claim 2
Dependent Claim
85 words
Apparatus for supporting a target undergoing radar measurements comprising: a base assembly; azimuthal positioner means coupled to said base assembly for rotating said base assembly in an azimuthal plane; a first and a second column being parallel and attached perpendicular to said base assembly; column separation adjusting means for adjusting the spacing between said first column and said second column; target attitude positioning means affixed to the distal end of said first column; and means for affixing a target to said target attitude positioning means.
Claim 3
Dependent Claim
24 words
Apparatus as defined in claim 1 and further comprising: stabilizer means orthogonally bridging said first and said second column and permitting parallel movement therebetween.
Claim 4
Dependent Claim
32 words
Apparatus as defined in claim 2 wherein said means for affixing said target to said target attitude positioning means includes a shaft coupled between said target and said target attitude positioning means.
Claim 5
Dependent Claim
25 words
Apparatus as defined in claim 3 wherein said first column is attached to said base assembly at the azimuthal rotational axis of said base assembly.
Claim 6
Dependent Claim
26 words
Apparatus as defined in claim 4 wherein said first column and said second column each have a cylindrical cross section and are formed of metallic material.
Claim 7
Dependent Claim
21 words
Apparatus as defined in claim 5 wherein said first column and said second column are each covered by radar absorbing material.
Claim 8
Dependent Claim
19 words
Apparatus as defined in claim 6 wherein said first column and said second column have the same outer diameter.
Claim 9
Dependent Claim
21 words
Apparatus as defined in claim 4 wherein said first column and said second column are each formed of fiber glass material.
References Cited (Backward Citations)
US2602924A
Cited
US3274597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |