Communication system

Details Communication system Communication system

1990-04-27

1991-10-29

Eisenzopf, Reinhard J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

34082549, 359142, H04B 1010

Patent

active

050621513

ABSTRACT:
Personnel locating system for use in a facility having a plurality of rooms having doorways therein comprised of a plurality of portable transmitters. Each of the transmitters includes a battery and each generates an infrared signal. The system also comprises a plurality of fixed receivers positioned to cover different rooms at a facility. Each room has a receiver therein positioned to accept infrared radiation from a substantial portion of the volume of the room. Each receiver is capable of sensing and storing any of the infrared signals generated by the transmitters during any time the transmitters are located anywhere in the facility including when located within a room. The system also includes apparatus for polling the receivers to determine the location of any transmitter independent of the previous location of the transmitter.

REFERENCES:
patent: 3403381 (1968-09-01), Haner
patent: 3478344 (1969-11-01), Schwitzgebel et al.
patent: 3492587 (1970-01-01), Hutton
patent: 4225953 (1980-09-01), Simon et al.
patent: 4275385 (1981-06-01), White
patent: 4601064 (1986-07-01), Shipley
Gfeller et al.--"Wireless In-House Data Communication"--Proc. of the IEEE--vol. 67, No. 11--Nov. 1979--pp. 1474-1486.

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