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:
Aug. 15, 1995
Filed:
Oct. 07, 1993
Shingo Kuwahara, Kawagoe, JP;
Satoshi Odagawa, Kawagoe, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A navigation apparatus is provided with: a measurement unit for measuring a self-position and outputting self-position data; a memory unit for storing map data which includes crossing data and road data; a map-matching unit, for map-matching the self-position data with respect to the road data; and a displaying unit for displaying the map-matched self-position data and the road data on the map data. The map-matching unit is provided with a first crossing searching unit for searching crossing data corresponding to a first crossing connected to a road, to which the self-position data is presently map-matched, and located within a first predetermined distance from the self-position. The first crossing searching unit outputs first candidacy crossing data. The map-matching unit is also provided with a second crossing searching unit for searching crossing data corresponding to a second crossing located within a second predetermined distance from the first crossing. The second crossing searching unit outputs second candidacy crossing data. The map-matching unit is further provided with a map-matching control unit for map-matching the self-position data with respect to the road data corresponding to roads connected to the first and second crossings indicated by the first and second candidacy crossing data.