GE Hai lang, SHE Bo, TAO Qian

（Iustitute of Electromechanical Engineering, Suqian College, Suqian 223800, China）

Abstract: Aiming at realizing electronic compass vulnerable to interference and high cost, electronic compass structure, tilt compensation, error analysis and correction were researched, inductive error sources and correction algorithms of electronic compass, and the electronic compass system based on STM32 ARM Cotex M3 and MEMS(Micro Electro Mechanical System) sensor was proposed. After the analysis of electronic compass error sources,the electronic compass error model was established. Kalman filtering algorithms was presented to collecting and integration of magnetoresistive sensor and accelerometer data. On the basis of accelerometer tilt data compensated the electronic compass, use MATLAB handle electronic compass from PC, the attitude angle and precision of electronic compass were tested. The results indicate that electronic compass have high precision and static attitude angle.

Key words: micro eletric mechanical system; magnetoresistive sensor; electronic compass; accelerometer