北京航空航天大学学报 ›› 2019, Vol. 45 ›› Issue (4): 827-833.doi: 10.13700/j.bh.1001-5965.2018.0470

• 论文 • 上一篇    下一篇

光电二极管的地球反照光校正及卫星姿态估计

褚理想, 樊巧云   

  1. 北京航空航天大学 仪器科学与光电工程学院, 北京 100083
  • 收稿日期:2018-08-10 出版日期:2019-04-20 发布日期:2019-04-26
  • 通讯作者: 樊巧云 E-mail:fqy@buaa.edu.cn
  • 作者简介:褚理想,男,硕士研究生。主要研究方向:微型太阳敏感器;樊巧云,女,博士,副教授,硕士生导师。主要研究方向:光电精密测量、天体敏感器及天文导航、机器视觉。
  • 基金资助:
    国家自然科学基金(61475012)

The earth's albedo correction of photodiodes and satellite attitude estimation

CHU Lixiang, FAN Qiaoyun   

  1. School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100083, China
  • Received:2018-08-10 Online:2019-04-20 Published:2019-04-26
  • Supported by:
    National Natural Science Foundation of China (61475012)

摘要: 光电二极管作为体积小、成本低的太阳敏感器,可以结合地球敏感器进行卫星三轴姿态估计,但是地球反照光对其具有严重的影响,从而限制了其应用,然而地球反照光数学模型应用复杂。针对此问题,首先建立了一种简化的光电二极管量测模型,将地球反照光设成动态偏置项补偿在光电二极管模型中,并将误差建模为混合高斯噪声。然后应用滑窗估计和随机权重策略动态估计和更新模型中的参数。同时,采用多比例因子分别估计各光电二极管的地球反照光影响,并引入Huber影响函数处理异常值,从而提高了算法鲁棒性和参数估计精度。实验结果表明,采用地球反照光校正的光电二极管量测模型和无迹卡尔曼滤波(UKF)算法可实现卫星的高精度姿态估计,三轴姿态精度能达到0.2°~0.3°。

关键词: 光电二极管, 地球反照光, 混合高斯噪声, 多比例因子, Huber影响函数

Abstract: As a small and low-cost sun sensor, the photodiode, combined with the earth sensor, can determinate full three-axis satellite attitude. However, the photodiode is sensitive to the surrounding light sources, such as the earth, which limits its application. The mathematical model of the earth's albedo is complicated. To solve this problem, a simplified measurement model of the photodiode, describing the effects of the earth's albedo as the dynamic bias and deviation as the mixed-Gaussian noise, is established first. Then parameters in the model are online estimated and updated with windowing and random weighting strategies. To improve the accuracy of the parameter estimation and robustness of the algorithm, the multi-scale factors are used to estimate the influence of albedo on each photodiode, and the Huber function is introduced to prevent the outliers. The experimental results show that the high-precision satellite attitude estimation can be achieved by the new measurement model and the unscented Kalman filter (UKF) algorithm, and the three-axis attitude accuracy can arrive at 0.2°-0.3°.

Key words: photodiodes, earth's albedo, mixed-Gaussian noise, multi-scale factors, Huber function

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