Study On The Calibration Method Of Magnetometer

With the development of science and technology,navigation technology as a form of national economy and scientific research strength,national attention,navigation technology has been in the ship,including aircraft,vehicles,has been used widely.The positioning precision of the inertial navigation system will reduce with time increasing,so it is difficult for a long time work independently,so often need to introduce the magnetometer to amend the heading angle.In the actual measurement,there is an inevitable problem of error,which will affect the accuracy of the navigation system,which will affect the accuracy of the navigation system.In order to improve the measurement accuracy of the magnetic gauge,the error interference of the magnetic gauge is required to be calibrated.According to the error of the sensor error,the system installation error and carrier interference error,the error mechanism of the magnetic gauge is analyzed in detail,and the deficiency of the error calibration method is analyzed.On this basis,the sensitivity error,zero-deviation error,non-positive error,and carrier interference error are divided into two categories,such as hard iron interference error and soft-iron interference error.The mathematical model of comprehensive error is established.An improved ellipsoid fitting calibration algorithm is proposed to compensate the error interference of the magnetometer.This thesis collected magnetic meter original data in accordance with the hard iron interference error and interference soft error compensation,and then through the MATLAB of the magnetometer calibration data before and after the distribution simulation,analysis of the impact of hard iron and soft iron interference on the magnetometer,finally through the simulation to verify the validity of the calibration method of compensation.In order to verify the accuracy of the calibration method,magnetometer calibration and output heading angle values were compared,test results show that after magnetic meter after calibration the measurement precision of heading angle is increased.In this paper,the calibration method of magnetometer is better than the traditional method,the error model is more perfect,the equation is simple,and the computational complexity is reduced...