基于矢量磁传感器模型的扩充T-L航磁补偿方法

An extended T-L aeromagnetic compensation method based on vector magnetic sensor model

关键词:  航磁补偿  扩充T-L航磁补偿方法  非线性  磁滞  灵敏度

Key words:  Aeromagnetic compensation  Expansion of T-L aeromagnetic compensation method  Nonlinear  Hysteresis  Sensitivity

摘要:

传统的Tolles-Lawson（T-L）磁补偿模型基于磁通门能够进行精确测量的假设。然而，该模型忽略了三轴磁通门的测量误差和非线性干扰，导致T-L补偿模型存在原理性误差。针对上述问题，在传统的T-L磁补偿模型的基础上，引入因磁滞效应引起的磁通门输出信号和灵敏度的非线性变化因素。通过量化磁滞效应及灵敏度变化引起的非线性，进一步完善了磁补偿模型。仿真实验结果表明，基于矢量磁传感器模型的扩充T-L航磁补偿方法相较于传统T-L模型，精度提升了58%；在无人机机载实验中，精度提升了49%。这一结果验证了扩充T-L磁补偿方法在抑制磁通门非线性干扰方面的有效性，将有助于提高航磁补偿性能，从而实现地磁场信息的准确获取。

Abstract:

The conventional Tolles-Lawson (T-L) magnetic compensation model is based on the assumption that fluxgates are capable of making accurate measurements. However, the model ignores the measurement errors and nonlinear disturbances of the three-axis fluxgate, which leads to a principle error in the T-L compensation model. To solve the above problems, the nonlinear variation factors of the fluxgate output signal and the sensitivity due to hysteresis effect are introduced based on the conventional T-L magnetic compensation model. The magnetic compensation model is further improved by quantifying the nonlinearity caused by the hysteresis effect and sensitivity change. The results of the simulation experiments show that the accuracy of the extended T-L aeromagnetic compensation method based on the vector magnetic sensor model is improved by 58% compared with the conventional T-L model, and the accuracy is improved by 49% in the unmanned aircraft flight experiments. This result verifies the effectiveness of the extended T-L magnetic compensation method in suppressing the fluxgate nonlinear interference, which will help to improve the aeromagnetic compensation performance and thus realize the accurate acquisition of geomagnetic field information.