集成电路与嵌入式系统2024，Vol.24Issue(4)：30-36,7.
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
摘要
Abstract
To resolve the issue concerning the susceptibility of the prevailing three-dimensional digital compasses in the market to exter-nal magnetic field interference during the detection of Earth's magnetic field,resulting in diminished measurement precision,a three-di-mensional 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Key words
ellipsoidal correction/least square method/tunnel magnetoresistance/three-dimensional digital compass/azimuth accuracy分类
信息技术与安全科学引用本文复制引用
张松浩,崔敏,张鹏..基于最小二乘法的三维TMR数字罗盘系统设计[J].集成电路与嵌入式系统,2024,24(4):30-36,7.基金项目
国防基金项目(2021-JJ-0726). （2021-JJ-0726）
