| 摘要 |
A method of locating an article or person comprises at least one transponding station (TS 1) having its own radio identity carried by a person or article in the radio coverage area of a radio system. The system comprises a plurality of clusters of spatially separate radio units (M1 to M7) having transceiving means and received signal strength determining means, each of the radio units having an individual identity. Each cluster is associated with a network interrogating station (NIU(1), NIU(2)) comprising transceiving means for communicating with at least the radio units in its cluster. A central station (10) has transceiving means for communicating with a plurality of the interrogating stations and storage means for storing a database comprising the locations of the radio units (M1 to M7). When it is required to determine the location of the transponding station, the central station transmits an enquiry signal to the interrogating stations which in turn broadcast the enquiry signal.
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