| 摘要 |
A location system (100) includes a plurality of beacon transmitters (20A-20D) each including a plurality of antennas (1-4) positioned in a generally circular arrangement. Each beacon transmitter (20A-20D) is configured to transmit an identification signal having a plurality of reference data and to transmit a directional signal from the plurality of antennas (1-4) by selecting one of the antennas (1-4) at a time in sequence around the circular arrangement to simulate a rotating antenna. The location system (100) further includes a receiver (30) configured to receive the identification signals and a plurality of Doppler-shifted directional signals each corresponding to one of the directional signals, wherein the receiver (30) is configured to generate a plurality of time data for each received Doppler-shifted directional signal, and wherein the receiver is configured to determine a location of the receiver (30) using each received Doppler-shifted directional signal, each time data, and each identification signal. <IMAGE>
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