一种顾及舱内OBE干扰的改进航磁补偿方法  

A modified aeromagnetic compensation methodrobust to in-cabin OBE interferences

作　　者：刘宇欣 李雯 魏东岩 申戈 LIU Yuxin;LI Wen;WEI Dongyan;SHEN Ge(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《导航定位与授时》2024年第4期38-46,共9页Navigation Positioning and Timing

基　　金：中国科学院青年创新促进会基金(E13314010D)。

摘　　要：航磁干扰补偿是飞行器地磁导航的必要环节,目前在航空磁探等领域广泛应用的Tolles-Lawson(T-L)模型需要辅以延伸杆或拖拽等方式,难以满足地磁导航对于不改变飞行器气动外观的应用需求。因此,提出了一种能够适应磁力计舱内安装的航磁补偿方法。该方法在T-L模型的基础上,扩展了机载电子设备(OBE)干扰项。同时,针对舱内磁干扰频域分布未知和干扰来源复杂的问题,设计了基于频谱拐点计算的滤波器截止频率确定方法和基于电流及电压相关性贡献度的模型输入特征选择方法。最后,采用主成分分析(PCA)降低模型复共线性的影响。通过一组开源的有人机实飞磁测数据对方法进行了验证,实验结果表明该方法对舱内磁测数据的补偿精度优于其他方法,最佳补偿结果与真值之间的均方根误差为1.71 nT,基本满足地磁导航终端的精度要求。It is a necessary link for aeromagnetic interference compensation in aircraft geomagnetic navigation.At present,the Tolles-Lawson(T-L)model widely used in aeromagnetic exploration needs extension rods or dragging,which makes it difficult to meet the application requirements of geomagnetic navigation without changing the aerodynamic appearance of the aircraft.An aeromagnetic compensation method which can adapt to the in-cabin installation of magnetometer is proposed.The method extends on-board electronic systems(OBE)interference term based on the T-L model.Meanwhile,to solve the problem of unknown frequency domain distribution and the complex interference sources,a filter cutoff frequency determination method is proposed based on knee point calculation of frequency spectrum and a model input feature selection method is designed based on correlation contribution calculation of current and voltage.Finally,the principal component analysis(PCA)is used to reduce the impact of multicollinearity of the model.The effectiveness of the method is verified through a set of open-source manned aircraft magnetic measurement flight data,and the results show that this method has better compensation accuracy for in-cabin magnetic measurement data than other methods.The root mean square error between the optimal compensation result and the true value is 1.71 nT,which can basically meet the accuracy requirements of geomagnetic navigation terminals.

关 键 词：航磁干扰补偿 磁干扰模型 机载电子设备干扰 地磁导航 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]