| 摘要 |
PROBLEM TO BE SOLVED: To improve calculation precision of a current position due to satellite navigation in simpler hardware configuration than the conventional one. SOLUTION: A navigation device calculates an estimation position in receiving timing from a GPS satellite due to estimation navigation (step 110), and specifies the current position of an own vehicle (step 170) by using pseudo distance data (step 120) based on signals received from a plurality of the GPS satellites in the receiving timing. However, the navigation device specifies the GPS satellite shielded on obstacles based on three-dimensional shape data of structures in map data and the GPS satellite whereby a vehicle 2 is reached by reflection waves (steps 140, 150, 160), and excludes signals from the former GPS satellite from a use object for measuring the current position (step 155). The navigation device makes weighing concerning the later GPS satellite a smaller value than weighing concerning the GPS satellites of other use objects (step 165). COPYRIGHT: (C)2009,JPO&INPIT |
