The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 1994
Filed:
Jul. 09, 1992
Satoshi Odagawa, Kawagoe, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A direction detecting device includes the following elements. A position measurement unit receives an electric wave from a satellite and generates first direction data from the electric wave. A geomagnetic sensor generates second direction data. A memory unit, which is coupled to the position measurement unit and the geomagnetic sensor, stores the first direction data and the second direction data respectively obtained at a previous measurement timing. A correction operation unit, which is coupled to the position measurement unit, the geomagnetic sensor and the memory unit, obtains data related to a true magnetic circle from the first direction data and the second direction data stored in the memory unit and the first direction data and the second direction data respectively obtained at a current measurement timing and for correcting an error contained in the current second direction data in accordance with the data related to the true magnetic circle.