High speed gyrocompass alignment via multiple kalman filter...

Details High speed gyrocompass alignment via multiple kalman filter... High speed gyrocompass alignment via multiple kalman filter...

G - Physics

01

C

G01C 25/00 (2006.01) G01C 21/16 (2006.01) G01C 19/38 (2006.01)

Patent

CA 2590134

A method of aligning a gyro-compass comprising operating at least two Kalman filters in a set of Kalman filters to generate an error correction to at least a single navigation solution in a set of navigation solutions in order to provide coarse alignment azimuth convergence. The method further comprises selecting at least one selected Kalman filter from the set of Kalman filters and at least one selected navigation solution from the set of navigation solutions, and operating the at least one selected Kalman filter and the at least one selected navigation solution to provide fine alignment convergence to a correct azimuth. The selecting is based at least in part on the generated error correction, each navigation solution includes an azimuth different from the azimuth of each other navigation solution and each navigation solution azimuth is separated by no more than two times a small angle error assumption.

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