| 摘要 |
<p>A tracking system (10) for tracking the movement of personnel around a predetermined location such as a work place, a hospital or a secure facility such as a prison includes a base station (12). The base station (12) includes a transmitter (14) for transmitting first signals (16)at a first frequency and a transceiver (18) for transmitting and receiving second signals (20) at a second, different frequency. The system (10) includes one or more tags (22), each tag (22) in use being worn by a user. Each tag (22) includes a receiver (24) for receiving the first signals (16) from the base station (12) at the first frequency and a transceiver (26) for transmitting and receiving the second signals (20) at the second frequency from and to the base station (12).</p> |
