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:
Mar. 19, 2013
Filed:
Sep. 04, 2009
Takashi Fukagawa, Kanagawa, JP;
Yoichi Nakagawa, Tokyo, JP;
Hirohito Mukai, Tokyo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A radio arrival direction estimation device that accurately estimates the arrival direction of radio waves from a desired tag, even when there are multiple antennas disposed at short intervals. When ID detection timing is provided from a timing detector () to a switch (), relative amplitude/phase data related to the tag ID digital value '1' or '0' is obtained by an arrival direction estimation unit (). One relative amplitude/phase datum is formed for each unit cycle in a first adder (), which adds the relative amplitude/phase datum related to the tag ID digital value “1” to each element in a matrix, and a second adder (), which adds the relative amplitude/phase datum related to the tag ID digital value “0” to each element in a matrix. An OOK signal causes an arithmetic unit () to subtract the relative amplitude/phase data produced by the second adder () from the relative amplitude/phase data produced by the first adder (), and extract the phase of a signal corresponding to the phase of the digital value “1.”