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

ZHANG Songhao; CUI Min; ZHANG Peng

doi:10.20193/j.ices2097-4191.2024.04.005

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Integrated Circuits and Embedded Systems ›› 2024, Vol. 24 ›› Issue (4) : 30-36. DOI: 10.20193/j.ices2097-4191.2024.04.005

Research Paper

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

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Abstract

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.

Key words

ellipsoidal correction / least square method / tunnel magnetoresistance / three-dimensional digital compass / azimuth accuracy

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ZHANG Songhao , CUI Min , ZHANG Peng. Design of three-dimensional TMR digital compass system based on least squares method[J]. Integrated Circuits and Embedded Systems. 2024, 24(4): 30-36 https://doi.org/10.20193/j.ices2097-4191.2024.04.005

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