Detection method and system

Details Detection method and system Detection method and system

1993-04-28

1995-06-13

Hellner, Mark

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

Presence detection only

By motion detection

342 27, G01S 1300

Patent

active

054247454

ABSTRACT:
The invention provides a method and a system for the detection of an object moving relative to another object. The object possibly being a person, an element, an installation, a tool, a surface, etc. According to the invention, a UHF wave is generated in a slotted antenna and the rays exiting from the slots are directed onto the area to be monitored. The reflected waves are detected and this frequency is compared with the frequency of the transmitted waves.

REFERENCES:
patent: 3392388 (1968-07-01), Nakahara et al.
patent: 3680085 (1972-07-01), Del Signore
patent: 3713156 (1973-01-01), Pothier
patent: 3890615 (1975-06-01), Moran
patent: 4180817 (1979-12-01), Sanford
patent: 4991146 (1991-02-01), Ransdell et al.
patent: 5192954 (1993-03-01), Brockelsby et al.
"Obstacle Detecting System"; Patent Abstracts of Japan; Mar. 29, 1979.

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