地磁匹配中的匹配长度估计方法  

Match length estimation in geomagnetic matching system

作　　者：刘颖[1] 吴美平[1] 

机构地区：[1]国防科学技术大学机电工程与自动化学院,长沙410073

出　　处：《中国惯性技术学报》2010年第4期439-443,共5页Journal of Chinese Inertial Technology

基　　金：武器装备探索研究项目(7130604)

摘　　要：在惯导/地磁组合导航系统中,适当选择匹配长度能有效提高匹配概率和匹配精度。针对地磁匹配特点,对匹配长度的选区原则和意义进行了分析,并提出了一种基于逐点迭代的匹配长度确定算法。该算法能够有效地给出匹配长度的估值或上界,使得匹配能在航迹形变最小处获得最优估计,有效提高了组合导航的定位精度。该算法是一个基于仿真实验的算法,通过不确定域的推进,获得地磁图在正反横、纵四个方向上的匹配长度范围,进而获得匹配长度上界。仿真实验验证了算法的优良性能。In geomagnetism aided inertial navigation system,match length is one of the most important parameters.A good choice of match length can help to increase matching probability and precision.In this paper,an analysis on how to choose match length is given.According to the characteristics of magnetic matching,a pointwise-iteration-based method is proposed to estimate the match length,in which an upper limit can be achieved.With the match length,optimal matching result can be obtained at the place where path distortion is minimal,which significantly increases the navigation precision.The proposed algorithm is based on simulation experiments,and the ranges of match length in four directions（up,down,left and right） is obtained by advancing the uncertain domains.Simulation experiments verify the higher performance of this new algorithm.

关 键 词：地磁匹配 匹配长度 逐点迭代 组合导航 

分 类 号：U666.1[交通运输工程—船舶及航道工程]