Patent ID: 6959240
Filing Date: 2005-10-25
Classification: G01C

Abstract:
1. A correction device for correcting acceleration data, correction being achieved by determining, via calculation, an offset value of an acceleration sensor which detects the acceleration of a mobile body and delivers the detection result as output, and by correcting acceleration data determined based on output from the acceleration sensor using the offset value, comprising: real acceleration calculating section for determining, by calculation, a real acceleration of the mobile body based on a signal changing in association with the moving velocity of the mobile body; velocity data acquiring section for acquiring horizontal and vertical velocity components by receiving radio waves from plural artificial satellites, and using a frequency change of received radio waves evoked as a result of Doppler effect; gradient angle calculating section for calculating a gradient angle between a horizontal plane passing through the mobile body and a plane towards which the mobile body is moving, based on the horizontal and vertical velocity components acquired by the velocity data acquiring section; gravitational acceleration sine of gradient angle calculating section for determining, by calculation, a gravitational acceleration sine of the gradient angle determined by the gradient angle calculating section; reference value calculating section for determining, by calculation, reference acceleration data based on the real acceleration provided by the real acceleration calculating section and on the gravitational acceleration sine of the gradient angle provided by the gravitational acceleration sine of the gradient angle calculating section; and correcting section for correcting the offset based on the reference acceleration data provided by the reference value calculating section.