Distance measurement using microwaves

Details Distance measurement using microwaves Distance measurement using microwaves

1973-03-06

1977-08-23

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 928

Patent

active

040443540

ABSTRACT:
A distance measuring system, particularly suitable for targets which are moving slowly relative to a fixed reference point, such as the upper surface of the burden in a blast furnace. A doubly modulated microwave beam is directed at the target, and the reflected beam is mixed with part of the original beam, which part has its phase varied sinusoidally at a frequency lower than the modulating frequencies. The difference frequency detected between the phase-varied signal and the reflected signal is directly proportional to the distance to the target.

REFERENCES:
patent: 3068471 (1962-12-01), Erst
patent: 3112481 (1963-11-01), Goldberg
patent: 3167766 (1965-01-01), Norris, Jr.
patent: 3197773 (1965-07-01), Black et al.
patent: 3403398 (1968-09-01), Engholm et al.
patent: 3680085 (1972-07-01), Signore

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