To exactly correct an error of a positioning data caused by an an ionized laler lag and an atmospheric layer lag to provide accurate positional information.
This mobile station 1 receives correction data from plural reference DGPS stations 5a, 5b,..., 5n transmitted via a center station 9 and a broadcasting station 11 together with the position information, to correct the correction data by a weighted mean method in response to distances from the respective DGPS reference stations 5 to calculate a true correction amount, and receives GPS signals from plural GPS satellites 3a, 3b,..., 3m to correct a calculated position of the mobile station 1 itself using the true correction amount, so as to provide the accurate positional information of the mobile station 1 itself.
TSURUMARU SHOKON
ISHIGAKI TOSHIHIRO
MATSUSHITA COMMUNICATION IND
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