AN IMPROVED NAVIGATION SYSTEM COMBINING SELF-CONTAINED NAVIGATION WITH RADIO NAVIGATION

摘要

Complementing each other with radio navigation and independent navigation, there is always provided a navigation apparatus capable of determining a current position with a certain level or more of reliability. The vehicle speed sensor 203 and the gyro 202 obtain a first pseudo current position of the moving object. The second pseudo current position can be obtained by correcting the first pseudo current position based on the road map information stored in the CD-ROM. The third pseudo current position can be obtained from the received information of the GPS receiver 205. If the second and third pseudo current positions are within a certain distance, the second pseudo current position is determined as the final current position. If the second and third pseudo current positions are separated by a predetermined distance or more, the speed and orientation of the moving object obtained from the received information of the GPS receiver 205 can be obtained, which is the speed and orientation by the sensor 203 and the gyro 202. Is compared with. If the degree of matching is high, the final current position is determined based on the third pseudo current position. If the degree of matching is low, the radionavigation is determined to be low in reliability, and the final current position is determined based on the second pseudo current position.