基于最小二乘法的三维TMR数字罗盘系统设计  

Design of three-dimensional TMR digital compass system based on least squares method

作　　者：张松浩 崔敏 张鹏 ZHANG Songhao;CUI Min;ZHANG Peng(School of Instrument and Electronics,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器与电子学院,太原030051

出　　处：《集成电路与嵌入式系统》2024年第4期30-36,共7页INTEGRATED CIRCUITS AND EMBEDDED SYSTEMS

基　　金：国防基金项目(2021-JJ-0726)

摘　　要：针对市面上现有的三维数字罗盘在进行地磁场检测时极易受到外界磁场的干扰进而导致测量精度低的问题,设计了一款基于最小二乘法的三维TMR(隧道磁阻效应)数字罗盘系统。对其在现实中的误差特点开展研究,在由椭球拟合法处理校正后,运用了最小二乘法开展误差补偿,补偿前其方位角精度为4.18°,补偿后其方位角精度为0.46°,结果显而易见,在精度方面拔高了一个数量级,降低了三维数字罗盘系统的方位角误差。实验结果显示,最小二乘法可以极大地提高三维数字罗盘系统的精度,该方法具有较高的工程应用价值。To resolve the issue concerning the susceptibility of the prevailing three-dimensional digital compasses in the market to external magnetic field interference during the detection of Earth's magnetic field,resulting in diminished measurement precision,a three-dimensional digital compass system employing the Tunnel Magnetoresistance(TMR)effect and grounded in the least squares method has been devised.The error characteristics of a three-dimensional digital compass in practical environments is studied.After being corrected by ellipsoidal fitting,the least squares method is used for error compensation.The azimuthal precision prior to compensation stood at 4.18°,whereas post-compensation,it reached 0.46°.This reflects a tenfold enhancement in accuracy,substantially mitigating azimuthal discrepancies within the three-dimensional digital compass.The empirical findings demonstrate that the utilization of the least squares approach substantially heightens the precision of three-dimensional digital compass systems,underscoring its substantial utility in engineering applications.In addition,given the high sensitivity characteristics of TMR sensors,they are extremely suitable for use in space,indicating that the system has extremely high application value.

关 键 词：椭球校正 最小二乘法 隧道磁阻效应 三维数字罗盘 方位角精度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]