Patent ID: 6208937
Filing Date: 2001-03-27
Classification: G01C,G01S

Abstract:
A method for generating navigation data utilizing a GPS-inertial navigation system and a direction-finding apparatus sharing a common platform, the method comprising the steps:(a) determining the position vector for one or more observation points in an earth-fixed reference frame;(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.