Acta Geodaetica et Cartographica Sinica ›› 2024, Vol. 53 ›› Issue (9): 1748-1760.doi: 10.11947/j.AGCS.2024.20240093

• Geodesy and Navigation • Previous Articles    

Multi-star tracker angular velocity reconstruction method considering temperature effect correction

Danyi HU1,2(), Yunlong WU1,3(), Yun XIAO4,5, Yue QIU6, Xiaohui WU1, Yulong ZHONG1   

  1. 1.School of Geography and Information Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China
    2.National Precise Gravity Measurement Facility, Huazhong University of Science and Technology, Wuhan 430074, China
    3.Hubei Key Laboratory of Regional Ecology and Environmental Change, China University of Geosciences(Wuhan), Wuhan 430074, China
    4.Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China
    5.State Key Laboratory of Geo-Information Engineering, Xi'an 710054, China
    6.DFH Satellite Co., Ltd., Beijing 100094, China
  • Received:2024-03-07 Published:2024-10-16
  • Contact: Yunlong WU E-mail:hudanyi@cug.edu.cn;wuyunlong@cug.edu.cn
  • About author:HU Danyi(2001—), female, postgraduate, majors in satellite gradiometry data processing. E-mail: hudanyi@cug.edu.cn
  • Supported by:
    The National Natural Science Foundation of China(42274111);The National Precise Gravity Measurement Facility 2024 Open Topic Support Project(PGMF-2024-P006);The Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan)(2024XLB13)

Abstract:

High-precision satellite attitude control is an important data preprocessing aspect of satellite gravity mission operation. The key payload star trackers onboard the gravity field and steady-state ocean circulation explorer (GOCE) satellite inevitably experience temperature variations in its low orbit, leading to inter-boresight angles (IBA) deviations ranging from 2 to 14 arcseconds, directly impacting the accuracy of satellite attitude. Quantitative analysis of temperature effects on satellite attitude and precise determination of satellite angular velocities are essential steps in the satellite data preprocessing workflow, directly influencing the accuracy of high-precision gravity gradient component reconstruction. In this study, based on the characteristics of the GOCE satellite mission, we develop a temperature effect correction method for joint attitude quaternion reconstruction using multiple star trackers. This method involves constructing a linear function of temperature-related relative attitude offsets between star trackers, establishing a weighted matrix considering the precision differences among sensor axes, and obtaining the optimal quaternion reconstruction of attitude velocities based on the principle of least squares. Additionally, in the original attitude data processing, we propose a logarithmic quaternion Hermite hypersurface interpolation method for data optimization. The research results demonstrate that the corrected attitude quaternions calculated from star tracker data exhibit no significant deviation when compared with reference frame information. Moreover, after temperature effect correction, the noise level of angular velocity for each tracker axis significantly decreases by approximately two orders of magnitude, achieving an accuracy of 10-10 rad·s-1 and significantly improving the precision of velocity reconstruction. Additionally, the angular velocity accuracy of each tracker axis maintains good consistency.The power spectral density of the gravity gradient trace calculated based on this method shows a more significant improvement in the whole frequency domain.

Key words: star tracker, inter-boresight angles, attitude quaternion, temperature effect, Hermite hypersurface interpolation

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