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基于轨迹约束的地磁场测量误差修正方法
引用本文:刘玉霞,周军,葛致磊.基于轨迹约束的地磁场测量误差修正方法[J].中国惯性技术学报,2012,20(2):205-210.
作者姓名:刘玉霞  周军  葛致磊
作者单位:西北工业大学精确制导与控制研究所,西安,710072
基金项目:国家自然科学基金,西北工业大学基础研究基金,航天科技创新基金
摘    要:根据磁强计综合误差的数学模型,提出了一种基于轨迹约束的地磁场测量误差修正的方法,同时也对该方法的有效性进行了分析.该方法首先由磁强计的测量数据,根据椭球轨迹的约束,采用最小均方估计作为判断准则,估计12个误差参数,然后利用此参数获得准确的地磁矢量信息.理论分析和仿真验证表明,在某些情况下,轨迹约束修正算法是不可观测的,也给出了检验不可观测存在的方法.由软磁干扰引起的误差不同于磁强计本身误差和安装误差.在出现由软磁干扰引起的误差时,轨迹约束修正算法仅仅能提供12个误差参数中的9个,其余的3个参数需要借助外在的信息来估计.

关 键 词:地磁导航  磁干扰  误差修正  轨迹约束

Correction method of magnetic measurement error based on locus constraints
LIU Yu-xia , ZHOU Jun , GE Zhi-lei.Correction method of magnetic measurement error based on locus constraints[J].Journal of Chinese Inertial Technology,2012,20(2):205-210.
Authors:LIU Yu-xia  ZHOU Jun  GE Zhi-lei
Institution:(Institute of Precision Guidance and Control,Northwestern Polytechnical University,Xi’an 710072,China)
Abstract:According to the general error model of magnetometer,a calibration method for geomagnetic measurement error is proposed,and its performance is analyzed.The proposed method adopts the least square algorithm under ellipse restriction,and estimates the 12 calibration parameters;then it uses these parameters to obtain the true geomagnetic field vector.Theory analyzes and simulation test shows that,in some instances,a locus-constraint calibration algorithm will be unobservable.And the method to examining whether it is unobservable is incorporated in the algorithm.The errors due to sort iron are different from the errors due to physical arrangement of the sensor axes.In the presence of soft-iron errors,locus-constraint algorithms can only provides 9 of the 12 calibration parameters.The remaining three parameters can be obtained by external information.
Keywords:geomagnetic navigation  magnetic interference  error calibration  locus constraint
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