中文说明：
matlab下m文件，能够提取compass三轴原始数据，并自动进行拟合矫正，得到其变换矩阵。将椭圆自动校正为圆心在原点的正圆。专门用于磁力计和重力计的自动校正。
English Description：
Matlab m file can extract the original data of compass triaxial, and automatically carry out fitting correction to get its transformation matrix. The ellipse is automatically corrected to be a circle whose center is at the origin. It is specially used for automatic calibration of magnetometer and gravimeter.