Patent ID: 7945384
Filing Date: 2011-05-17
Classification: G01C

Abstract:
1. A navigation apparatus comprising: a main unit to be attached to a mobile object through a predetermined base section on which the main unit is mounted, the main unit detecting a current position of the mobile object based on positioning information supplied from a predetermined positioning unit; an acceleration calculation unit for calculating acceleration applied to the mobile object based on the mobile object's speed calculated based on the positioning information; an acceleration sensor for observing acceleration applied to the main unit; an attachment inclination calculation unit for calculating an attachment inclination of the acceleration sensor with respect to the mobile object, based on the mobile object's acceleration and the observed acceleration; a speed estimate unit for estimating, while the positioning information is not being supplied, a speed and position of the mobile object, based on the observed acceleration and the attachment inclination; a mounting detection section for detecting whether the main unit is mounted on the base section; and a speed estimate control unit for forcing the speed estimate unit to stop estimating the speed when the mounting detection section detects that the main unit is not mounted on the base section.