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:
Apr. 08, 2003
Filed:
Jul. 31, 2001
Eiichi Tanaka, Kanagawa, JP;
Akira Shinada, Tokyo, JP;
Masayasu Ito, Chiba, JP;
Makoto Sasaki, Chiba, JP;
Shigeru Tanaka, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
Providing a car navigation apparatus which can always detect a position of a car with high accuracy, and can obtain traffic information in a practical manner. The car navigation apparatus according to the present invention obtains the DGPS correction data from a base station nearest the car in two-way radio communication instead of obtaining the DGPS correction data by receiving the FM broadcasting. Accordingly, the current position of the car can always be detected with high accuracy. Furthermore, the car navigation apparatus according to the present invention obtains traffic information by having access to a traffic information providing system in two-way radio communication instead of obtaining traffic information by receiving the FM broadcasting. So, the car navigation apparatus can obtain traffic information near the current position selectively or according to the priority. Accordingly, the car navigation apparatus can promptly obtain traffic information when necessary, and can obtain necessary traffic information promptly.