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. 16, 2010
Filed:
Jun. 12, 2007
Shigeru Imafuku, Shiojiri, JP;
Mikio Nagahara, Matsumoto, JP;
Shunichi Mizuochi, Matsumoto, JP;
Akifumi Hayashi, Azumino, JP;
Tomoyuki Kurata, Matsumoto, JP;
Shigeru Imafuku, Shiojiri, JP;
Mikio Nagahara, Matsumoto, JP;
Shunichi Mizuochi, Matsumoto, JP;
Akifumi Hayashi, Azumino, JP;
Tomoyuki Kurata, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A terminal device includes a plurality of search channel sections which search for a positioning satellite, a candidate reception frequency calculation section which calculates a candidate reception frequency of a first acquisition target satellite by causing the search channel sections to perform the correlation accumulation process for a first accumulation time, a candidate frequency confirmation section which confirms reliability of the candidate reception frequency by causing the search channel sections to perform the correlation accumulation process for a second accumulation time longer than the first accumulation time, a final frequency calculation section which calculates a final frequency by causing the search channel sections to perform the correlation accumulation process for a third accumulation time longer than the second accumulation time, and a first difference calculation section which calculates a difference between an estimated synchronization frequency corresponding to each first acquisition target satellite and the final frequency.