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:
Nov. 13, 2007
Filed:
Mar. 04, 2005
Kotaro Wakamatsu, Iwaki, JP;
Kotaro Wakamatsu, Iwaki, JP;
Alpine Electronics, Inc., Tokyo, JP;
Abstract
Available-satellite data indicating satellites available for satellite positioning is obtained from a GPS receiver, and satellites continuously available for satellite positioning in the current instance and the previous n times are extracted as candidate satellites referring to available-satellite record data. Four of the candidate satellites are selected so that the satellites used for satellite positioning the previous time are selected with priority as the satellites to be used for satellite positioning in the current instance, and the selected satellites are set in designated-satellite data. The GPS receiver performs three-dimensional positioning using the four satellites designated by the designated-satellite data. If the number of extracted candidate satellites is three, these three extracted candidate satellites are selected as the designated satellites and are set in the designated-satellite data. The GPS receiver performs two-dimensional positioning using these three designated satellites. If the number of extracted candidate satellites is smaller than three, satellite positioning is not performed.