| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of parallel reception circuits by performing reception processing of only a part of visible satellites, in a satellite navigation device for determining the position, the speed or the like of a user by receiving satellite signals from satellites in a single or a plurality of satellite navigation systems. SOLUTION: Satellites in a single or a plurality of satellite navigation systems are selected so that a distribution of each satellite in the sky has a closest shape at the equal interval, to thereby reduce a deterioration state of DOP (Dilution of Precision) caused by shielding the selected satellites by an obstacle. Each reception time rate of the selected satellites is always measured, and, concerning satellite selection of time, a satellite having a high reception time rate is left as it is, and a satellite having a low rate is removed. COPYRIGHT: (C)2010,JPO&INPIT |
