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:
Jan. 23, 2007
Filed:
Mar. 24, 2005
Tomohiro Ebuchi, Hitachinaka, JP;
Dai Watanabe, Hitachi, JP;
Hiroshi Taoka, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A train position detection system which enables train position detection based on a combination of passing information obtained when a train passes over a point at which a ground marker is installed and position information about the ground marker stored in an onboard device. The onboard device, a ground marker receiver and a track digital telegram receiver are mounted on a train. A ground marker that transmits passing information to the onboard device is provided on a track circuit, and a ground device that transmits a track digital telegram containing position information about the ground marker (marker position information) to the onboard device is provided. The onboard device stores the marker position information contained in the track digital telegram, and the position of the train is determined based on the passing information transmitted from the ground marker and the position information about the ground marker stored in the onboard device.