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. 11, 2011
Filed:
Jun. 17, 2009
Takashi Fukagawa, Kanagawa, JP;
Hirohito Mukai, Tokyo, JP;
Yoichi Nakagawa, Tokyo, JP;
Tadao Inoue, Hyogo, JP;
Takashi Fukagawa, Kanagawa, JP;
Hirohito Mukai, Tokyo, JP;
Yoichi Nakagawa, Tokyo, JP;
Tadao Inoue, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A wireless distance measurement system and a wireless distance measurement method that measure the distance between a base station and a terminal without clock synchronization between a plurality of base stations, and without requiring input of the position relationships between a plurality of base stations. Clock phase shift section () shifts a clock that is used to generate transmission pulses is phase-shifted by a specific amount every 100 nanoseconds, and A/D conversion section () converts a signal re-radiated from terminal () to a digital signal using the shifted clock. Correlation calculation section () performs correlation calculation between the digital signal and the transmission pulse and creates a delay profile by adding digital signals in the shifted phases between same phases, and incoming wave detection section () detects peaks of the pulses in the delay profile. Distance calculation section () calculates the distance to terminal () based on the timings to transmit the pulses and the timings to detect peaks of the pulses.