| 摘要 |
PROBLEM TO BE SOLVED: To reflect a positioning altitude in an excellent state in an altitude without immobilizing a movable body when the altitude is measured by using both of navigation positioning data and air pressure data.SOLUTION: A barometric altimeter 1 includes: an air pressure sensor 20; a navigation positioning data receiving section 10; an altitude change amount arithmetic section 34 for calculating an altitude change amount on the basis of an air pressure change amount; a positioning altitude arithmetic section 32 for calculating a positioning altitude of a movable body on the basis of navigation positioning data; an altitude arithmetic section 36 for calculating an altitude on the basis of the positioning altitude and the altitude change amount; and a positioning altitude variation determination section 35 for determining whether or not variations of the positioning altitude satisfy predetermined conditions. The altitude arithmetic section 36 corrects the altitude on the basis of the positioning altitude when the variations of the positioning altitude are determined to satisfy the predetermined conditions. |
