| 摘要 |
The monitoring assembly (10) monitors the location of mobile objects (12), i.e., personnel, within a structure (18). The object (12) carries a transponder (14) which periodically transmits status signals and receives command signals. Transceivers (16) are fixed at locations about the structure (18) for receiving the status signal producing the location signals, and transmitting commands to the transponders. The transmissions and reception occur during prescribed time windows. A central controller (20) is connected to each transceiver (16) and monitors the location of transponders (14) and communication therethrough. The transponders (14) have audio capability of producing audio messages directly to the person thereof, especially during emergency conditions for assistance. The controller (20) transmits synchronizing signals to the transceivers (16), which in turn synchronize themselves and transmit the synchronizing signal to the transponders (14) for synchronizing.
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