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:
Sep. 21, 2010
Filed:
Sep. 19, 2008
Shigeru Sato, Tokyo, JP;
Juei Igarashi, Kanagawa-Ken, JP;
Akira Kamiya, Kanagawa-Ken, JP;
Tsutomu Yamate, Kanagawa-Ken, JP;
Shigeru Sato, Tokyo, JP;
Juei Igarashi, Kanagawa-Ken, JP;
Akira Kamiya, Kanagawa-Ken, JP;
Tsutomu Yamate, Kanagawa-Ken, JP;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
A method and system for azimuth measurements using one or more gyro sensors is disclosed. The method includes acquiring a first data from each of the gyro sensors with an input axis aligned to a first angular orientation and acquiring a second data from each of the gyro sensors with the input axis flipped to a second angular orientation opposite to the first angular orientation. An earth rate component at the first angular orientations is determined based on a difference between the first data and the second data to cancel out bias of each of the gyro sensors. The method may include acquiring a third data of the gyro sensor with the input axis aligned to the same angular orientation as the first angular orientation. An average of the first data and the third data may be used instead of the first data for determining the earth rate component.