Locating system

Details Locating system Locating system

1990-03-28

1991-09-24

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340529, 340572, 342 44, 342 51, H04B 700

Patent

active

050517414

ABSTRACT:
A locating system and method in which a network of communication stations are spread over a surveillance area. Each moveable element is provided with a transponder having an associated identification code. A paging signal sent out over the surveillance area is picked up by the transponders and the one with the identification code provided in the page responds. The response is made at a frequency different from the page. The response is picked up by the nearest communication stations. A master station communicates with the communication stations at a frequency different from that used by the paging signal or the transponder. The master station which interrogates all the communication stations locates the paged transponder to within a sector bordered by the communication stations that received the response from the transponder. The communication stations can be subdivided into three or more interspersed arrays.

REFERENCES:
patent: 4818998 (1989-04-01), Apsell et al.
patent: 4864313 (1989-09-01), Konneker

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