| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption in a positioning device for performing positioning by a GPS and that by inertial navigation. SOLUTION: A car navigation apparatus 1 determines whether an index value indicating the reception situation of GPS satellite signals satisfies first predetermined low-level conditions, turns on a sensor for inertial navigation when it is determined that the first predetermined low-level conditions are satisfied, and turns off the sensor when it is determined that the first predetermined low-level conditions are not satisfied. When it is determined that the first low-level conditions are satisfied, it is determined whether the index value satisfies the second low-level conditions that are lower than the first low-level conditions. When it is determined that the second low-level conditions are satisfied, an inertial navigation operation processing is performed and an inertial navigation operation position is determined to be an output position. When it is determined that the second low-level conditions are not satisfied, a GPS positioning position positioned by a GPS reception section 20 is determined to be an output position. COPYRIGHT: (C)2009,JPO&INPIT |
