초록 ▼

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 anten

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.

대표청구항 ▼

A radar test assembly of low radiation cross section for rotatably supporting a test subject to be illuminated by a radar signal from the antenna of a radar set comprising: a fixture, first rotator means for rotating the fixture, a platform for supporting the test subject, means for mounting said pl

A radar test assembly of low radiation cross section for rotatably supporting a test subject to be illuminated by a radar signal from the antenna of a radar set comprising: a fixture, first rotator means for rotating the fixture, a platform for supporting the test subject, means for mounting said platform on said fixture, second rotator means for rotating the platform relative to the fixture, said fixture including a shield extending outwardly from an edge of the platform to form an envelope enclosing said first rotator and the platform and including an opening therein for receiving a test subject to be attached to the platform, the shield having electrically conducting surfaces inclined relative to a direction of propagation of radiation from the antenna for directing reflections of radiation emanating from the fixture away from the antenna, the fixture extending in curved fashion to form a body enclosing the rotator and the platform; and a radiation seal extending from the edge of the opening in the fixture to interface between a surface of the fixture and the platform.