| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems such that in a device which measures the distance between a terminal and a signal generation source or receiver in a radio communication and computes the position of the terminal from the result of that distance measurement, a base station being a transmission source can not be determined by a one-to-one correspondence definitely with respect to an estimated propagation time of a base-station signal, and erroneous recognition of a base station occurs in some cases, as a result, positioning accuracy deteriorates. SOLUTION: A sending-source specifying means which specifies a sending source of a received signal, or makes it clear to be incapable of its sending source specification, and an information selecting means which enables acquired information and estimated information on base stations which can not be specified, are used. Consequently, deterioration of the positioning accuracy is prevented. COPYRIGHT: (C)2004,JPO
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