Acta Geodaetica et Cartographica Sinica ›› 2022, Vol. 51 ›› Issue (12): 2462-2469.doi: 10.11947/j.AGCS.2022.20210388

• TH-2 Satellite System • Previous Articles     Next Articles

High-precision estimation and verification for the centroid of satellite based on error correction

CHEN Ting1, LI Wu2, WU Yuanbo1, LI Shizhong2, SHAO Long2   

  1. 1. Shanghai Institution of Satellite Engineering, Shanghai 200240, China;
    2. China Centre for Resources Satellite Data and Application, Beijing 100094, China
  • Received:2021-07-19 Revised:2022-05-17 Published:2023-01-12

Abstract: The centroid deviation of the receiving antenna is usually necessary to be modified during satellite precise orbit determination, and to correct the measurement data of the reference point to the centroid of the satellite. The deviation of the centroid in different directions has significant influence on orbit determination. Due to the large flat deployable antenna and the weight of the solar cell array as well as the ground test equipment, test methods, and the environmental factors, the centroid of the satellite under the state of on-orbit is difficult to be directly measured on the ground. At the same time, the centroid of satellite can be affected by other deployable components of satellite. All these factors directly increase the difficulties for predicting the centroid of the satellite. Aiming at the influence of the satellite centroid error on the baseline measuring accuracy of distributed SAR satellite, a satellite centroid prediction technology based on the existing centroid measurement technology to improve the estimation accuracy of satellite centroid is proposed in this paper. Based on the theory of error correction, the method of calculating the centroid of a satellite with second-order precision is realized by combining the calculation of the centroid with the measured data based on enough mass and centroid information of measurable parts. The errors of the centroid a on-orbit satellite are analyzed by this method, and the results show that the method achieves the expected results after the on-orbit test calibration.

Key words: centroid of satellite, high-precision estimation, error of centroid, error correction

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