载荷数据和对日导引律修正星敏安装矩阵算法

doi:10.7527/S1000-6893.2023.29502

Abstract

Abstract:

The mission of the Advanced Space-based Solar Observatory Satellite （ASO-S） is to observe the Sun activity. To satisfy the requirements for high precision and high stability， the extended Kalman filtering algorithm based on measurements of Star Tracker （STR） and fiber optic gyro is used for attitude determination. The reflected light coming from atmosphere of earth can affect the STR， so 3 on-board STRs will be available alternately. Because of assembling error of STRs， there will be a large attitude control error when the STR used for attitude determination changes. To reduce this control error， unification of the measurements obtained from the 3 STRs is necessary. Meanwhile， the assembling error of STR with respect to the measuring basis of payload should be calibrated for higher precision of attitude control. One of the main payloads on-board ASO-S named the White-light Solar Telescope （WST） can get full solar images shortly after entering the orbit. Then， the two-dimensional heliocentric deviation angle can be got by solar image processing. At the same time， another payload named Sun Guide Telescope （SGT） on ASO-S can directly measure the two-dimensional deviation angle between its detector center and the solar center. An on-orbit modification algorithm for installation matrix of STR is proposed by using solar observation data of payload and the guidance law of the satellite for sun pointing control. Mathematical simulation is used to validate the correctness of the proposed algorithm. In comparison with the simulation model of STR， the precision of installation matrix calculated by 10 full solar images of WST is less than 3″， and the result calculated by 300 s measurements data from SGT is less than 0.2″. The on-orbit telemetry data of ASO-S are used to validate this algorithm. The deviation error between the sun pointing control error and deviation angles measuring from SGT is less than 15″， so the assembling precision between STR and SGT is improved 1.5 times.

Key words: high-precision and high-stability, two-dimensional deviation angle, sun guide telescope, guidance law, installation matrix

CLC Number:

V448.2

Binglong CHEN, Lei WANG, Bang LIU, Heng ZHOU. Modification algorithm for installation matrix of star tracker by payloads data and sun pointing guidance[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(13): 329502-329502.

Figures/Tables 11

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偏差角	仿真设置/（″）	WST修正值/（″）	SGT修正值/（″）
Δθ_A	-180	-179.970 87	-179.885 99
Δψ_A	180	177.130 23	180.046 14
Δθ_B	-180	-180.100 09	-180.176 77
Δψ_B	-180	-182.812 30	-180.085 96
Δθ_C	180	180.020 10	180.003 26
Δψ_C	180	177.146 44	179.859 57

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Modification algorithm for installation matrix of star tracker by payloads data and sun pointing guidance

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