Hybrid monitoring of location of a site confinee

Details Hybrid monitoring of location of a site confinee Hybrid monitoring of location of a site confinee

1996-10-21

1999-04-06

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082549, 34087001, 340539, 340572, 340573, 34082554, 342357, 342450, 379 38, G08B 2100

Patent

active

058924540

ABSTRACT:
Method and apparatus for monitoring present location of a person ("confinee") who is to be confined to a designated site, which site can have a diameter as small as a few meters or as large as several kilometers. The present location of the confinee is checked at selected time intervals with time periods ranging from one second to thousands of seconds, as desired. The confinee wears a location-determining ("LD") unit that receives electromagnetic signals that contain information allowing determination of the present location of the LD unit, and thus of the confinee, from three or more non-collinear outdoor LD signal sources and from three or more non-collinear indoor LD signal sources. The indoor LD signal sources may be radiowave transmitters. The outdoor LD signal sources may be transmitters for a Loran, Omega, Decca, Tacan, JTIDS Relnav or PLRS or similar ground-based system, or transmitters for a satellite positioning system, such as GPS or GLONASS. The relative phases or transmission times for the signals from each indoor LD signal source are determined and provided for the LD unit. The present location or change location of the LD unit is determined and compared with the permitted site location coordinates at a sequence of selected times to determine if the confinee is present at the site at such times. The LD unit issues an alarm signal if the confinee is not on the site and has not arranged beforehand site can be redefined, for a selected time interval, to include the first permitted site, a second permitted site and a corridor extending between the first and second permitted sites for a selected time interval, after which the permitted site can be changed again to include only the first or to temporarily leave the original permitted site to seek medical attention or to attend to other needs, or to be moved permanently to the second site.! The permitted site can be redefined at any time and for any subsequent time interval. One or more exclusion sites can be designated where the confinee is not permitted to go at any time.!

REFERENCES:
patent: 4209787 (1980-06-01), Freeny, Jr.
patent: 4918425 (1990-04-01), Greenberg et al.
patent: 4918432 (1990-04-01), Pauley et al.
patent: 4924211 (1990-05-01), Davies
patent: 5014040 (1991-05-01), Weaver et al.
patent: 5196825 (1993-03-01), Young
patent: 5218344 (1993-06-01), Ricketts
patent: 5268670 (1993-12-01), Brasch et al.
patent: 5627520 (1997-05-01), Grubbs et al.

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