Radio searching system

Details Radio searching system Radio searching system

1996-07-29

1998-11-10

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340569, 340539, G08B 2100

Patent

active

058350179

ABSTRACT:
In a radio searching system, a present position of an object under search such as a mentally handicapped aged person and a mountain climber is correctly defined and displayed by utilizing the characteristics of the radio signals. The radio searching system is comprised of a portable radio unit for transmitting a radio signal having a predetermined frequency, searching radio units provided at a plurality of searching points, for receiving the radio signal transmitted from the portable radio unit, a position defining unit for defining a position of an object under search on which the portable radio unit is mounted based on the transmission direction of the radio signal received by the searching radio unit, and an image display unit for displaying on an image, the position of the object under search defined by the position defining unit.

REFERENCES:
patent: 4918425 (1990-04-01), Greenburg
patent: 5014040 (1991-05-01), Weaver
patent: 5218344 (1993-06-01), Ricketts
patent: 5289163 (1994-02-01), Perez
patent: 5396224 (1995-03-01), Dukes

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