星敏与磁强计安装矩阵的户外标定

Calibration of Installing Matrix Between Magnetometer and Star Sensor

关键词:  星敏  三轴磁强计；安装矩阵  标定  误差模型

Key words:  Star sensor  Three-axis magnetometer  Installing matrix  Calibration  Error model

摘要:

为了提高卫星测量地磁场参数的精度，必须提高卫星上星敏与磁强计安装矩阵的测量精度，因此，提供了一种借助地磁场与地面观星对星敏与磁强计安装矩阵进行户外地面标定的方法。首先建立了三轴磁强计的误差模型，利用磁强计在地磁场中进行翻滚试验标定了误差模型系数，同时给出了3个敏感轴矢量在地理坐标系下的表示。其次利用星敏观星，测量了星敏光轴单位矢量相对地理坐标系的表示。最后以地理坐标系为桥梁，给出了星敏与磁强计之间的安装矩阵。对该方法进行了仿真，结果表明其能有效准确地辨识出磁强计误差模型中的各项误差系数以及星敏与磁强计安装矩阵。

Abstract:

In order to enhance the measurement accuracy of the parameters of the geomagnetic field,the installing matrix between three star sensors and three-axis magnetometer must be precisely measured.The method of measuring the matrix was put forward by way of the geomagnetic field and observing the stars in outdoor open field.The error model about the three-axis magnetometer was established at first,through tumble test in the geomagnetic field,the coefficients of the error model was calibrated and the representations of three unit vectors of magnetometers sensitive axes in the geography coordinate system were achieved.3 unit vectors’ denotations of star sensors in the geography coordinate system were also gained by observing stars.Using geography coordinate system as a bridge,the installing matrix between star sensors and magnetometer was attained.It is proved that the installing matrix is identified effectively and precisely by simulation calculation.