Trihedral radar reflector

Details Trihedral radar reflector Trihedral radar reflector

1987-11-16

1989-06-27

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Radar reflector

Corner

H01Q 1518

Patent

active

048433969

ABSTRACT:
A new type of passive trihedral corner reflector is described which rotates the polarization of a reflected microwave beam by 90.degree. and thereby permits a reflected radar beam to be more easily distinguished by the interrogating radar system from the random reflections from nearby objects, i.e., clutter. Rotation of the incident beam is provided by locating a passive polarizing or "twist" grid of closely spaced thin parallel wires spaced above one conducting surface by air or by a dielectric to give an electric spacing from the surface of about 0.25 .lambda.. The spacing of the wires is less than 0.25 .lambda. so that the wires constitute a reflecting surface for signals polarized parallel to the wires. The reflector can have triangular or square sides which are mutually orthogonal. In a preferred embodiment the reflector is tipped forward by 35.degree. from a reference horizontal plane and tilted clockwise in a vertical reference plane by 15.degree. to optimize reflections. The reflector has particular application to navigation systems, especially to maritime navigation systems.

REFERENCES:
patent: 2472782 (1949-06-01), Albersheim
patent: 2697828 (1954-12-01), Heintz
patent: 2786198 (1957-03-01), Weil et al.
patent: 2872675 (1959-02-01), Kennaugh
patent: 3161879 (1964-12-01), Hannan et al.
patent: 3167769 (1965-01-01), Boyer
patent: 3309705 (1967-03-01), Blank et al.
patent: 3417398 (1968-12-01), Lewis et al.
patent: 3737904 (1973-06-01), Mori et al.
patent: 4724436 (1988-02-01), Johansen et al.
Microwave Journal, (Jul. 1983), "Polarimetric Techniques in Radar Signal Processing", S. R. Cloude, pp. 119-127.
Principals of Radar, (1952), Section 9.4, "Navigation and Pilotage"-Corner Reflectors, Reintjes, et al., pp. 324-331.
Antenna Engineering Handbook, (1961), Chapter 13, "Passive Reflectors", Jakes et al, pp. 13-1-13-14.
Antenna Engineering Handbook, (1961), Chapter 25, "Radar Antennas", R. L. Mattingly, pp. 25-1-25-8.
Bell System Technical Journal, (Oct. 1947) vol. 26, "Targets for Microwave Radar Navigation", S. D. Robertson, pp. 852-869.
Principals of Radar, (1952), Section 1.3, "Design Considerations", Reintjes et al., pp. 14-19.

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