Personal location system
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United States of America Patent
Stats
-
Jan 2, 2001
Grant Date -
N/A
app pub date -
Apr 15, 1999
filing date -
Apr 28, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A monitoring and location system comprising a service center from which movement to and from a prescribed local area and a prescribed wide area is to be monitored. Each member of a class being monitored is provided with a personal RF transponder unit (RFTU). Each RF transponder unit has a digital electronic identification number (DEIN) embedded therein for transmission by RF upon request. RF transceiver interrogation units define specific egress/ingress zones for the prescribed areas. Each interrogation unit being connected to the service center to god signal (1) when an RFTU has egressed or ingressed a prescribed area and (2) the DEIN embedded therein. The RF transceiver interrogation units can determine distance and bearing to a given RFTU and DEIN. When there are a plurality of cell sites encompassing the prescribed areas, an RF transceiver interrogation unit at each of the cell sites, respectively, are connected to the service center. Each RFTU has an emergency signalling component which, when activated, causes a range and bearing measurement to that RFTU to be made and sent to the service center for action.
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Family
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