Ground Calibration of Chang‘E-7 Lunar Orbit Magnetometer
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摘要: 环月磁强计是安装在嫦娥七号轨道器上的矢量磁场探测载荷，由两个三分量磁通门传感器构成。根据嫦娥7号的科学任务，环月磁强计的设计量程为±128nT和±2000nT，采样率为128Hz。为了支撑未来磁场数据的应用，参照了过去多个卫星任务的标定方法，地面标定试验对载荷的性能进行全面的测试。本文介绍了环月磁强计的系统组成和设计特点，分析了在轨数据处理的基本流程，根据在轨磁场数据处理算法的输入要求，以及评估载荷性能的需求，制定了正样产品地面标定试验的方法，并通过试验标定了磁通门的频率响应、噪声、线性参数和温度效应等参数。结果表明，环月磁强计磁场探测的不确定度优于0.05nT，载荷探测准确度可以达到0.5nT。Abstract: The Lunar Orbit Magnetometer (LOM) is a vector magnetic field detection payload installed on the Chang 'e-7 orbiter, consisting of two three-component fluxgate sensors. According to the scientific mission of LOM, the range of LOM is designed to be ±128nT and ±2000nT, and the sampling rate is designed to be 128Hz. In the article, the design and components of LOM are introduced。Based on the basic data processing pipeline on orbit, the methods of the ground calibration tests of the flight model of LOM are established. The performances of lOM, such as the frequency response, noise, linear parameters and temperature effect of the fluxgate are calibrated through experiments., and the calibration results can provide support for the processing of future on orbit magnetic field data. The test results show that the uncertainty in the magnetic field detected by LOM is better than 0.05nT, and the ground calibration accuracy of LOM can reach 0.5nT.
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