一种AMR磁罗盘的误差建模与校准方法  

Error modeling and calibration method of AMR compass

作　　者：孙宏伟[1] 房建成[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《北京航空航天大学学报》2009年第1期104-107,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国防基础科研资助项目(D2120060013);国家自然科学基金重点资助项目(6736025)

摘　　要：针对传统磁罗盘硬磁校准时容易受到外界干扰,标定校准为相对值的问题,详细分析了AMR(Anisotropic Magneto Resistance,各向异性磁阻效应)磁罗盘的系统误差并建立其误差模型,提出了标量校准方法用于磁罗盘的硬磁标定校准.与传统方法相比,该方法不需要确切的航向参考值,利用任意多位置下的大量测试数据通过迭代求取校准参数的最优解,通过施加约束避免校准过程中磁干扰的影响,并且校准值为绝对矢量.经过硬磁校准,磁罗盘航向精度提高7倍.实验结果验证了该方法的有效性和实用性.During the hard magnetism calibration process of compass by traditional methods, the compass was always disturbed and the calibration parameters were relative values. Considering these problems, the errors of anisotropic magneto resistance （AMR） compass were analyzed, the error model of compass was established and a method called scalar calibration was used to calibrate the compass. Compared with the traditional calibration methods of compass, the scalar calibration method didn＇t need the reference of head direction. During the calibration of the compass by this method, a great volume test data of any different positions was used to estimate the optimal parameters by iteration. So this method could reduce magnetism disturbance influences through exerting the restraint and the calibration value is the absolute vectors. By the hard magnetism calibration, the precision of compass was improved by 7 times. The experimental result proves the validity and usability of this method.

关 键 词：磁罗盘 标量校准 硬磁误差 

分 类 号：V341.611[航空宇航科学技术]