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首页> 外文期刊>Optical engineering >Spacecraft angular velocity estimation algorithm for star tracker based on optical flow techniques
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Spacecraft angular velocity estimation algorithm for star tracker based on optical flow techniques

机译：基于光流技术的恒星跟踪器航天器角速度估计算法

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摘要

An integrated navigation system often uses the traditional gyro and star tracker for high precision navigation with the shortcomings of large volume, heavy weight and high-cost. With the development of autonomous navigation for deep space and small spacecraft, star tracker has been gradually used for attitude calculation and angular velocity measurement directly. At the same time, with the dynamic imaging requirements of remote sensing satellites and other imaging satellites, how to measure the angular velocity in the dynamic situation to improve the accuracy of the star tracker is the hotspot of future research. We propose the approach to measure angular rate with a nongyro and improve the dynamic performance of the star tracker. First, the star extraction algorithm based on morphology is used to extract the star region, and the stars in the two images are matched according to the method of angular distance voting. The calculation of the displacement of the star image is measured by the improved optical flow method. Finally, the triaxial angular velocity of the star tracker is calculated by the star vector using the least squares method. The method has the advantages of fast matching speed, strong antinoise ability, and good dynamic performance. The triaxial angular velocity of star tracker can be obtained accurately with these methods. So, the star tracker can achieve better tracking performance and dynamic attitude positioning accuracy to lay a good foundation for the wide application of various satellites and complex space missions.
机译：集成导航系统通常使用传统的陀螺仪和恒星跟踪器进行高精度导航，但缺点是体积大，重量重且成本高。随着深空和小型航天器自主导航的发展，星跟踪器已逐渐被直接用于姿态计算和角速度测量。同时，随着遥感卫星等成像卫星对动态成像的要求，如何在动态情况下测量角速度以提高恒星跟踪仪的精度是未来研究的热点。我们提出了一种用非陀螺仪测量角速度并改善星跟踪器动态性能的方法。首先，采用基于形态学的恒星提取算法提取恒星区域，并根据角距离投票的方法对两幅图像中的恒星进行匹配。通过改进的光流法测量星像的位移。最后，使用最小二乘法通过星矢计算星跟踪器的三轴角速度。该方法具有匹配速度快，抗噪能力强，动态性能好的优点。用这些方法可以准确地获得恒星跟踪仪的三轴角速度。因此，恒星跟踪仪可以获得更好的跟踪性能和动态姿态定位精度，为各种卫星和复杂空间任务的广泛应用奠定良好的基础。

著录项

  • 来源
    《Optical engineering》 |2018年第2期|023101.1-023101.11|共11页
  • 作者

    Yujie Tang; Jian Li; Gangyi Wang;

  • 作者单位

    Beihang University, Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, Haidian, Beijing, China;

    Beihang University, Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, Haidian, Beijing, China;

    Beihang University, Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, Haidian, Beijing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    star tracker; optical flow analysis; angular velocity estimation;

    机译：星追踪器光流分析;角速度估计;

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