Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system
Patent
1988-07-06
1989-11-07
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
G01S 740
Patent
active
048795607
ABSTRACT:
Measurement of radar cross section is provided by a rotatable platform which supports a test subject to be measured, the rotatable platform and a rotator thereof being enclosed within a fixture configured as a body shaped as an airfoil. A second rotator rotates the fixture body to face a radar antenna which illuminates the test subject, the orientation of the fixture body being selected to minimize a radar cross section of the fixture body. The configuration of the generally airfoil shape minimizes radar cross section in a preferred direction of the body. A metallic seal in the form of a thin foil overlays an interface between the rotatable platform and a surface of the fixture in the manner of a fairing which reduces spurious reflections from the vicinity of the rotator, the seal being formed of a foil having a thickness substantially less than one-quarter wavelength of radiation of the antenna to inhibit generation of reflections from the seal. This permits measurement of very low radar cross sections of the test subject.
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Anderson Terry J.
Block Robert B.
Northrop Corporation
Sotomayor John B.
Tarcza Thomas H.
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