一种手持式MEMS磁力计的罗差校正方法

Error Calibration Method of Magnetic Deviation for Hand-Held MEMS Magnetometer

针对手持式MEMS磁力计使用过程中航向精度低的问题,在分析磁力计误差的基础上,建立了罗差校正模型,推导了罗差系数的计算公式,采用椭圆假设、约束最小二乘法、解卷绕和滑动窗口滤波等方法降低磁力计航向误差。该校正过程简单方便,只需手持MEMS传感器组旋转一周。实验结果表明,该校正方法具有良好的抗噪声性能,校正后的磁力计航向精度优于1°。

Due to the limitation of heading accuracy in Hand-held MEMS magnetometer,a magnetometer error model was established to improve its accuracy,which is based on the analysis of magnetometer error,meanwhile,the formula of magnetic deviation coefficient was deduced. Some methods of dealing with the data,which included elliptic assumption,least square method,unwrapping and smoothing window filter,were adopted to reduce the heading error of magnetometer. The experiment shows that the operation is simple. Just holding a set of MEMS sensor and rotating it around the whole operation is completed. This method is of stronger anti-noise ability,whose corrected accuracy of heading angle is better than 1°.