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AssigneeHughes Electronics Corporation
InventorsRongsheng Li, Yeong-Wei A. Wu, Douglas H. Hein, Garry Didinsky
Estimating the term…
A system and method of estimating the attitude of a spacecraft compares a three-axis inertial-based estimate of spacecraft attitude to a stellar-based estimate of the spacecraft attitude. A Kalman filter having some states associated with low spatial frequency errors compares the stellar-based attitude estimate to the inertial-based estimate of attitude and apportions total attitude error into two time varying matrices. A first time varying matrix is associated with star tracker low spatial frequency errors, a second time varying matrix is associated with gyro bias errors and attitude errors. The time varying matrices are used to apply corrective feedbacks to the stellar-based attitude estimate and the inertial-based estimate of spacecraft attitude, and are adaptively adjusted to minimize total estimated attitude error.
A system for correcting star tracker low spatial frequency errors in stellar-inertial attitude determination systems, comprising:
A method of correcting the low spatial frequency errors in a stellar-inertial attitude determination system, comprising the steps of:
Dependencies are inferred from the claim text.