电子罗盘的标定方法研究

Research of calibration method for electronic compasses

分析了对基于MEMS加速度计和磁强计的电子罗盘进行误差系数标定的重要性,介绍了MEMS惯性器件误差来源及其类型,着重分析了静态误差的来源,并建立了相应的静态误差模型。在此基础上,分别给出了MEMS加速度计和磁强计的误差因子标定方法,并详述了标定的步骤。设计的MEMS加速度计静态误差标定方法,结合位置转台,仅需6位置即可同时实现加速度计多种静态误差系数的标定,而磁强计的标定则要分不同的误差类型依次进行,数学实现方便快捷可靠,可满足一般性手持设备的导航精度要求。

The importance of error coefficient calibration of electronic compass based on MEMS accelerometer and magnetometer is analyzed in this paper. The origins and styles of the errors of MEMS inertial components are introduced with emphases on the origins of static errors, and then the static error mathematical models are established, On the base of the forward discussions, the calibration methods for the error coefficients of MEMS accelerometer and magnetometer are presented, and the steps of the calibration process are described in detail. Depending on the position turntable, the given calibration method for the static errors of MEMS accelerometer only needs six positions to be measured to complete the whole static calibration of accelerometer at the same time. And the calibration of magnetometer is completed in turn according to the error style. The calibration methods presented in this paper are convenient and reliable, and can meet requirements of the common handheld devices for the navigation accuracy.