Attitude Measurement Low Frequency Error Identification and Compensation for Star Tracker with Gyros

Abstract:

The low-frequency error (LFE) of star tracker is the most critical problems in the high accuracy attitude determination for the satellite. In this paper a novel approach is proposed to identify and compensate the attitude measurement LFE of the star trackers. The main difficulty in the attitude LFE identification is to distinguish the attitude LFE from the attitude motion. To overcome this difficulty, the gyro data, which is sensitive to the attitude motion, was used to fit the measurement attitude data to obtain the reference attitude. It is shown that, the LFE can be identified by comparing the measurement attitude and the reference attitude. The attitude LFE repeated feature is characterized well by the proposed method. By utilizing the orbital repeated feature, the LFE of the star trackers can be estimated. Finally, a LFE compensation strategy is presented base on the LFE estimation results. The validity and efficiency of the proposed approach are demonstrated by the relative Euler angle results from two test star trackers on-board the STECE satellite.

• Periodical: Applied Mechanics and Materials (Volume 664)
• Pages: 298-303
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.664.298
• Online since: October 2014
• Authors: Yu Wang Lai*, De Feng Gu, Jun Hong Liu, Wen Ping Li, Dong Yun Yi
• Keywords: Attitude Determination, EKF, Fiber Optic Gyro, Low Frequency Error, Star Tracker

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