| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of a position of a positioning object estimated by satellite navigation.SOLUTION: A reliability derivation device compares a positioning error variance value which is calculated on the basis of positioning errors for a positioning object included in positioning information obtained from signals successively received from a satellite and represents a variance value of the positioning errors, with a first threshold. The reliability derivation device compares speed information of the positioning object which is calculated on the basis of a ground speed of the positioning object included in the positioning information, with a second threshold. The reliability derivation device updates a determination threshold on the basis of the comparison result of the positioning error variance value and the comparison result of the speed information. The reliability derivation device compares the positioning errors with the determination threshold to determine a reliability showing the degree of reliability of the positioning information. |
