Title: Offset detection of acceleration sensor and navigation system
Application Number: 200610126950 Application Date: 2006.09.06
Publication Number: 1928568 Publication Date: 2007.03.14
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01P15/00;G01C21/00;G01C21/16
Applicant(s) Name: Sony Corp. Address:
Inventor(s) Name:
Attorney & Agent: dongfang yuan
Abstract:
    To accurately detect a zero gravity offset in an acceleration sensor. As an embodiment of the present invention, in the case where position information can be obtained from a GPS processing section, a velocity detecting unit performs an operation according to Expression (15), using real detected acceleration Gr that was actually obtained from the acceleration sensor, vehicle acceleration alpha P based on the position information, distance Dm, an amount of height change Dh based on pressure PR, and gravity acceleration g. Therefore, offset acceleration alpha o can be accurately calculated, and an acceleration detection signal can be converted into detected acceleration alpha G with high accuracy, based on a zero gravity offset value Vzgo by that the above offset acceleration alpha o was converted.
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