基于增强型MAD单特征量地磁匹配导航算法

摘要

为了提高基于MAD(mean absolute differences,平均绝对差)算法的单特征量地磁匹配导航系统的定位精度,研究分析了影响MAD算法的地磁匹配定位精度的主要因素,引入RANSAC(random sample consensus,随机抽样一致)鲁棒算法与粗精匹配结合的分层搜索策略来提高匹配精度及缩短匹配时间.仿真试验结果表明,该算法能够在一定程度上提高单特征量的地磁匹配的精度与稳定性,并大大缩短匹配时间.%To improve the positioning precision of single element geomagnetic matching navigation system based on MAD ( mean absolute differences) , the main factors affecting the precision of the geomagnetic matching positioning based on MAD are investigated. The layered searching strategy based on coarse exact integrative matching and RANSAC (random sample consensus) is introduced into the algorithm to improve the matching accuracy and shorten the matching time. The simulation results show that, to some extent, these methods could improve the geomagnetic matching precision and stability, and could shorten the matching time.