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. 27, 2001
Filed:
Jul. 29, 1998
James R. Huddle, Chatsworth, CA (US);
Litton Systems Inc., Woodland Hills, CA (US);
Abstract
The invention is a method and apparatus for generating navigation data. The method comprises the steps of (a) determining the position vector for one or more observation points in an earth-fixed reference frame and (b) determining either (1) the position vector for a target point in the earth-fixed reference frame from directions in either a model-based or a gravity-based reference frame from the one or more observation points to the target point or (2) the directions in either a model-based or a gravity-based reference frame from the one or more observation points to the target point from the position vector for the target point in the earth-fixed reference frame, the model-based reference frame having a vertical axis with a specified orientation with respect to a normal to an ellipsoidal model of the earth and having horizontal axes with specified orientations with respect to the earth-fixed reference, the gravity-based reference frame having a vertical axis with a specified orientation with respect to the gravity vector and having horizontal axes with specified orientations with respect to the earth-fixed reference frame. The apparatus for practicing the method for generating navigation data comprises an inertial navigation system, a GPS antenna and receiver, and direction-finding apparatus.