【発明の名称】受動レーダ目標物

Japanese Patent JPH03501313

A

PCT No. PCT/GB88/00489 Sec. 371 Date Mar. 12, 1990 Sec. 102(e) Date Mar. 12, 1990 PCT Filed Jul. 10, 1987 PCT Pub. No. WO89/00773 PCT Pub. Date Jan. 26, 1989.A passive radar target comprises a sond lens (50) of substantially uniform dielectric constant, having a reflecting surface (51) integrally formed therewith, the lens being constructed of particulate material having a dielectric constant selected such that radar waves striking the surface of the surface of the lens are focussed on the reflecting surface. In one form the particulate material comprise silica flour (91, 101) contained within a thin radar transparent polycarbonate shell. The shell is formed of two similar halves (102, 103) with a pressed aluminum reflective lining (92, 106) in one half. By making the lens axially symmetrical such that the forward and rearward surfaces have a radius of curvature that decreases with distance from the axis of symmetry (102, 103) the lens-reflector can be made to operate over a wide solid angle. In addition the paths of the reflected energy can be made slightly divergent since this has been found to optimise the reflected intensity and to provide the capability for detection of the target by a receiver spaced from the transmitter. Two such lens-reflectors back-to-back will provide substantially omnidirectional operation. In an alternative arrangement back-to-back concave reflecting surfaces (114, 115) are centrally located within a single spherical shell (117) filled with particular material (116). In some applications a particulate filler such as powdered slate is held by means of a polyurethane foam.

Ritsuji, Leslie Derek
Ritux, Cliff Aude

JP50419387A

March 22, 1991

July 10, 1987

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United Kingdom

H01Q15/08; H01Q15/23; (IPC1-7): H01Q15/08; H01Q15/23

Yoshio Kawaguchi (2 outside)

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