定位导航技术是智能交通系统(ITS)的关键技术之一。文章首先介绍了GPS、INS(惯性导航)、DR(航位推算)三种常用定位导航技术,重点研究了各自的优点及缺点。接着探讨了GPS/DR组合定位导航技术的优势所在。最后,为了进一步提高定位精度,提出采用MM(地图匹配)技术来进一步修正误差,使得定位功能更加准确可靠。 Positioning navigation technology is one of the key technologies of Intelligent Transportation System (ITS). The article first introduces three commonly used navigation technologies, GPS, INS (inertial navigation) and DR (dead reckoning), focusing on their respective advantages and disadvantages. Then discussed the advantages of GPS / DR combined positioning and navigation technology. Finally, in order to further improve the positioning accuracy, MM (map matching) technology is proposed to further correct the error so that the positioning function is more accurate and reliable.