Real-time Estimation of Time-varying Magnetometer Errors for Small Satellite Missions

通过实验，我们清楚地了解了磁强计误差随周围铁磁材料等不同误差源的时变规律。时间变化在磁力计偏置项上最为明显。将实验设置与地球上的环境影响隔离开来并模拟空间环境是获得健康实验数据的最具挑战性的任务。利用实验数据，对一种集传感器定标和姿态估计功能于一体的小卫星磁强计实时定标算法进行了评价。设计了另一种利用陀螺仪测量的姿态无关实时全磁强计标定算法。研究成果正在准备发表。

Experiments are concluded with a clear understanding about the time-variation of the magnetometer errors depending on different error sources such as ferromagnetic materials nearby. Time-variation is most observable on magnetometer bias terms. Isolating the experiment setup from the environment effects on Earth and mimicking the space environment was the most challenging task to get healthy experiment data.The experiment data is used to evaluate a real time magnetometer calibration algorithm for small satellites that integrates sensor calibration and attitude estimation functions in a single algorithm. Another attitude-independent real time full magnetometer calibration algorithm that uses gyro measurements is also designed. Research results are being prepared for journal publication.