Communication system and device having unit locating feature

Details Communication system and device having unit locating feature Communication system and device having unit locating feature

1997-11-21

1999-12-14

Le, Amanda T.

Communications: electrical

Continuously variable indicating

With meter reading

375377, H04L 2300

Patent

active

060023422

ABSTRACT:
A communication system (700) comprises a plurality of base sites (702-708) which include a first antenna (712) for transmitting a synchronous communication protocol such as a paging protocol and a second antenna (714) for transmitting a rotating phase signal. A communication device (250) takes the synchronous communication protocol and develops a reference signal (220) from the received protocol. The communication device (250) takes the reference signal (220) and the received rotating phase signal (214) and uses a phase detector (216) to produce a phase difference signal (232) which is substantially equal to the angle of the communication device (250) with respect to the particular base site (702-708) which transmitted the signals. In order to determine the location of the communication device at least two such phase difference signals (232), one phase difference signal from at least two different base sites is determined. In the preferred embodiment, the phase difference signals (232) are transmitted by the communication device (250) to a paging system controller (710) for calculation of the proximate location of the communication device (250).

REFERENCES:
patent: 3680121 (1972-07-01), Anderson et al.
patent: 4816783 (1989-03-01), Leitch
patent: 5010343 (1991-04-01), Anderson
patent: 5095500 (1992-03-01), Tayloe et al.
patent: 5128665 (1992-07-01), Deluca et al.
patent: 5327144 (1994-07-01), Stilp et al.
patent: 5379047 (1995-01-01), Yokev et al.
patent: 5555183 (1996-09-01), Willard et al.

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