The Study Of Electronic Compass Based On Magnetoresistance Effect

Since ancient times compass had been an important tool in orientation.With the development of science and technology,the electronic compass gradually replace the traditional compass in navigation,aerospace,exploration and other fields.Today,with the rapid development of all kinds of navigation technology,the electronic compass is still widely used as a basic tool in the field of navigation.Based on this background,this paper uses the AMR sensor as the magnetic sensitive element to study the electronic compass system.The main research contents showed below:This paper aims to achieve a miniaturization,portable,precision within 3 °,to meet the general needs of the electronic compass.Firstly,based on the principle of electronic compass measurement,according to the expected performance index of the compass system,the design of the structure,chip selection,circuit design,function verification and parameter adjustment are carried out in the hardware,which is necessary to calculate the heading angle of the electronic compass.Secondly,in order to match the hardware design,software and data extraction to carry out the implementation of software filtering algorithm,error compensation correction algorithm and heading angle calculation work.After the software filtering algorithm is processed,the interference component in the data is suppressed and the sampling curve is smooth.The data compensation algorithm significantly improves the accuracy of the heading angle output.Finally,an electronic compass prototype based on anisotropic sensor is designed.The electronic compass system has an average error of 2 ° in the rotation angle range of 0 ° ~ 360 °,and in the dip angle range of ± 30 °,the compass still work and meet the accuracy requirements.