Patent ID: 7978127

Claim:
A mobile-unit positioning device in which phases of pseudo noise codes carried on satellite signals from a plurality of satellites are observed at a mobile unit to measure a position of the mobile unit, comprising: a pseudo-distance measuring part measuring a pseudo distance for every satellite between one of the plurality of satellites and the mobile unit during a stop of the mobile unit using an observed value of the pseudo noise code phase acquired during a stop of the mobile unit; an error-index-value computing part computing an error index value for every satellite indicating an error of the measured pseudo distance, based on the pseudo distances measured by the pseudo-distance measuring part at a plurality of points in time during a stop of the mobile unit; a weighting-factor determining part determining a weighting factor for every satellite based on the error index value for every satellite computed by the error-index-value computing part; and a positioning computation part performing a weighted positioning computation using the weighting factor for every satellite determined by the weighting-factor determining part, to determine a position of the mobile unit during movement using an observed value of the pseudo noise code phase acquired during movement of the mobile unit.