地磁导航基于方向可变滑动窗口快速匹配方法  

A Method of Fast Geomagnetic Matching Based on Orientation Alterable Sliding Window

作　　者：余超[1] 郭庆[1] 谢文俊[1] 曾鸿 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038 [2]成都飞机工业有限公司军代室,四川成都610092

出　　处：《计算机仿真》2015年第3期86-89,共4页Computer Simulation

基　　金：博士后科学基金(2013M542540);陕西省自然科学基础研究计划项目(2012JQ8010)

摘　　要：地磁匹配制导系统在对初始点进行重新搜索时,现有方法采用的匹配搜索算法需要使用具有大量浮点运算的误差函数,降低了匹配效率。为解决上述问题,提出一种利用地磁形状特征和方向可变滑动窗口技术的快速搜索方法,采用0、1作为形状特征描述地磁数据,用Hamming距离作为误差函数,利用载体的航向信息动态建立搜索窗口,可有效减少窗口内相似性比较的次数。仿真结果表明,上述方法在不降低匹配精度的前提下,可有效提高地磁匹配初始点的搜索效率。When the initial matching point is searched for geomagnetic system,the efficiency of matching of existing algorithms is low because they usually use error functions which have lots of computations of floating point numbers. A new method for fast searching based on geomagnetic shape character and orientation alterable sliding window technology was presented. Using 0 and 1 as the shape characters to describe geomagnetic data,Hamming distance as error function,and course information as sliding window,the similarity retrieval times in sliding window has been decreased. Simulation results indicate that this method can greatly improve the efficiency of original point searching in geomagnetic matching without reducing the matching precision.

关 键 词：相似搜索 欧氏距离 方向可变 滑动窗口 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]