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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2019, Vol. 40 ›› Issue (10): 323163-323163.doi: 10.7527/S1000-6893.2019.23163

• Electronics and Electrical Engineering and Control • Previous Articles     Next Articles

Online estimation of low frequency error for star tracker based on vertical filter

YE Lijun1,2,3, LIU Fucheng2,3, YIN Haining2,3, XU Ying2,3, BAOYIN Hexi1,3   

  1. 1. School of Aerospace Engineering, Tsinghua University, Beijing 10084, China;
    2. Shanghai Aerospace Control Technology Institute, Shanghai 201109, China;
    3. Shanghai Key Laboratory of Aerospace Intelligent Control Technology, Shanghai 201109, China
  • Received:2019-05-16 Revised:2019-07-10 Online:2019-10-15 Published:2019-08-12

Abstract: It's an efficient way to enhance the attitude measurement accuracy by data fusion of multi-sensors, and the sensor's Low Frequency Error (LFE) should be calibrated before data fusion. First, the generating mechanism of the star tracker's LFE is introduced, and the reason why the LFE should be estimated online is explained. Second, considering the deficiency of the traditional algorithm in LFE estimation, the way of LFE estimation based on vertical filter is proposed. The proposed method turns the estimation of LFE into several constant errors, improving the accuracy of the estimation. Third, the detailed operation steps are given, and the physical significance and the se-lection principle of related parameters are explained. Theoretical analyses and simulations show that the error of this algorithm could be ignored. In-orbit data simulation shows that the orbital period LFE of the star tracker could be eliminated.

Key words: low frequency error, orbital period, vertical filter, online estimation, star tracker, data fusion

CLC Number: