低轨磁测卫星干扰磁场标定方法研究

为了提高空间磁场探测精度，磁测卫星一般将磁强计安装在长伸杆的顶端，同时通过整星磁洁净控制，来减小磁强计安装位置的磁场干扰量.针对低轨磁测卫星的特点，提出零磁场环境下卫星极弱干扰磁场的高精度测量方法，模拟在轨地磁场环境下卫星感应磁场的标定方法，以及磁力矩器剩磁不确定量的处理方法.通过以上方法对卫星本体产生的干扰磁场实施严格的标定和数据修正，可有效减小其影响，极大提升空间磁场探测精度.该方法已应用于电磁监测卫星，将整星的磁场干扰不确定量降低一个量级，达到优于0.3 nT的水平.

Calibration methods of the interference magnetic field for Low Earth Orbit (LEO) magnetic satellite

In order to improve the accuracy of space magnetic field detection, the magnetometer of magnetic satellite is usually installed on the top of its long boom, meanwhile the magnetic field interference on magnetometer position is reduced by controlling satellite magnetic cleanliness. Based on the characteristics of LEO magnetic satellite, a series of methods are proposed, including high-precision measurement for the extremely weak interference magnetic field in the zero magnetic field environment, calibration of the satellite induced magnetic field in the orbital magnetic and processing uncertain quantity of the remaining magnetic field. The accuracy of space magnetic field detection can be effectively improved by implementing strict calibration and correcting data by virtue of these methods. These methods have been applied to the seismo-electromagnetic satellite, reducing the uncertain value of magnetic field interference of the satellite by one order of magnitude, which reaches above 0.3 nT.