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:
Jul. 31, 2001
Filed:
Mar. 08, 2000
Robert Leonard Nelson, Jr., Austin, TX (US);
Trimble Navigation LTD, Sunnyvale, CA (US);
Abstract
Method and system for determining a position of a platform using a set of range measurements between the platform and a set of known positions that avoids the frequent recalculation of square-roots in range predictions. The platform state estimate is updated by substituting the difference between the square of the range measurement and the square of the distance from the assumed position of the platform to the known position to which the range measurement corresponds scaled by the inverse twice distance between the predicted position of the platform and the known position, for each of the measurement residuals. The predicted state of the platform is updated until the platform state converges on a limit to a desired accuracy.