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Effective Use of Magnetometer Feedback for Smart Projectile Applications

机译：有效利用磁强计反馈实现智能弹丸应用

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摘要

The use of magnetometers for orientation estimation on rapidly-spinning flight bodies is analyzed. Specifically, the effect of spin-induced magnetic field distortion is discussed, with particular attention to its implications for magnetometer-based orientation estimation. First, the nature of spin-induced field distortion is described and it is shown that, if not properly accounted for, distortion can lead to significant estimation errors in artillery projectiles. Then, an orientation estimator is constructed driven by magnetometer, gyroscope, and GPS feedback. A novel feature of this algorithm is its compensation for spin-induced distortion of the Earth's field. The algorithm also incorporates in-flight magnetometer calibration performed simultaneously with projectile orientation estimation. The comprehensive algorithm is built as a coupled set of Extended Kalman filters. Observability of the estimation problem is discussed and unobservable modes are identified. Finally, example results and Monte Carlo simulations compare estimation performance to algorithms which neglect spin-induced distortion effects or do not perform in-flight calibration. These results demonstrate that magnetometer-based systems on-board spinning projectiles should incorporate corrections for field distortion, and that overall accuracy is greatly enhanced by performing in-flight calibration.
机译：分析了磁力计在快速旋转飞行器上的方位估计中的使用。具体地说，讨论了自旋感应磁场畸变的影响，并特别注意了其对基于磁力计的方位估计的影响。首先，描述了自旋感应场畸变的性质，结果表明，如果不适当解决，畸变会导致炮弹的估计误差很大。然后，由磁力计，陀螺仪和GPS反馈驱动构造方向估计器。该算法的一个新功能是对自旋引起的地球场失真进行补偿。该算法还结合了飞行中的磁力计校准，同时执行了弹丸方向估计。该综合算法构建为扩展卡尔曼滤波器的耦合集合。讨论了估计问题的可观察性，并确定了不可观察的模式。最后，示例结果和蒙特卡洛模拟将估计性能与忽略自旋引起的失真效应或不执行飞行中校准的算法进行了比较。这些结果表明，基于磁力计的系统在机载旋转弹丸上应包含场畸变的校正，并且通过执行飞行中校准可以大大提高整体精度。

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  • 来源
    《Navigation》 |2011年第3期|p.203-219|共17页
  • 作者

    JONATHAN ROGERS; MARK COSTELLO; THOMAS HARKINS; MOSHE HAMAOUI;

  • 作者单位

    Georgia Institute of Technology, Atlanta, GA, 30332;

    Georgia Institute of Technology, Atlanta, GA, 30332;

    US Army Research Laboratory, Aberdeen, MD, 21001;

    Data Matrix Solutions, Inc., Aberdeen, MD, 21001;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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