基于最小二乘法的三维TMR数字罗盘系统设计OACSTPCD

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.