首页|顾及温度效应改正的多星敏感器角速度重建方法

顾及温度效应改正的多星敏感器角速度重建方法

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高精度卫星姿态控制是卫星重力数据预处理的重要环节.地球重力场和海洋环流探测(GOCE)卫星搭载的关键荷载星敏感器在低轨运行状态中,不可避免地受到空间环境的温度变化影响,导致星敏感器视轴夹角(IBA)存在2"～14"偏移,直接影响卫星姿态的精度.定量分析温度效应对卫星姿态的影响,精确测定卫星角速度,是卫星数据预处理流程中的重要环节,直接影响高精度重力梯度分量构建的精度.本文基于GOCE卫星任务的特性,构建了一种多星敏感器联合姿态四元数的温度效应改正方法,包括星敏感器之间的相对姿态偏移量构建为温度相关线性函数,结合星敏感器各轴的精度差异建立加权矩阵,依据最小二乘原理得到最优姿态四元数重建角速度.同时,在原始姿态数据的解算中,构建一种对数四元数Hermite超曲面内插方法进行数据优化处理.研究结果表明,改正后的星敏感器姿态四元数计算出的IBA与参考框架信息对比无明显偏移.且经过温度效应改正后,星敏感器各轴角速度噪声水平大幅下降了约两个量级,精度达到10-10 rad·s-1,显著提高了角速度重建的精度,各轴角速度精度保持良好一致性.基于本文方法计算得到的重力梯度迹的功率谱密度,在整个频域内有较为明显的改善.
Multi-star tracker angular velocity reconstruction method considering temperature effect correction
High-precision satellite attitude control is an important data preprocessing aspect of satellite gravity mission opera-tion.The key payload star trackers onboard the gravity field and steady-state ocean circulation explorer(GOCE)satellite inevi-tably 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.

star trackerinter-boresight anglesattitude quaterniontemperature effectHermite hypersurface interpolation

胡丹怡、吴云龙、肖云、仇越、吴晓辉、钟玉龙

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中国地质大学(武汉)地理与信息工程学院,湖北武汉 430074

华中科技大学精密重力测量研究设施,湖北武汉 430074

中国地质大学(武汉)区域生态过程与环境演变湖北省重点实验室,湖北武汉 430074

西安测绘研究所,陕西西安 710054

地理信息工程国家重点实验室,陕西西安 710054

航天东方红卫星有限公司,北京 100094

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星敏感器 视轴夹角 姿态四元数 温度效应 Hermite超曲面内插

国家自然科学基金国家自然科学基金国家自然科学基金国家精密重力测量科学中心2024年度开放课题支持项目中国地质大学(武汉)中央高校基本科研业务员

422741114193107442374032PGMF-2024-P0062024XLB13

2024

10.11947/j.AGCS.2024.20240093

测绘学报
中国测绘学会

测绘学报

CSTPCD北大核心
影响因子：1.602
ISSN：1001-1595
年,卷(期)：2024.53(9)
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