| 摘要 |
PROBLEM TO BE SOLVED: To identify indoors the geographic position of a mobile communication device and enhance position identifying accuracy, in a wireless mobile communication system. SOLUTION: The phase difference between a known stable reference signal 11 and a known signal outputted from wireless mobile communication devices 5, 5B are judged in known several positions 1-4, 1B-4B. Then, the position of the wireless mobile communication device is judged based on the phase difference information. An approximate position of the wireless mobile communication device 5A can be estimated by sending a message in a specified power level 71 from said device and estimating that the sent massage is received where of a plurality of specified positions 1A-4A. Thereby, even if a relatively narrow bandwidth signal is used, accurate position judgment is made possible indoors.
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