| 摘要 |
A location system comprises a plurality of transponders whose locations are detectable by a base system. The base system interrogates ( 51 - 55 ) the transponders one at a time in accordance with a schedule of consecutive time slots. In response to a priority request received ( 53 ) from one of the transponders, the base system interrupts the schedule and interrogates substantially immediately ( 56,57,55 ) the signalling transponder so as to determine its location with minimal latency.
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